title
Temporary tables in SQL Server Part 34
description
In this video we will learn about
1. What are temporary tables
2. The 2 different types of temporary tables -- Local Temporary Tables and Global Temporary tables
3. Difference between local and global temp tables
Text version of the video
http://csharp-video-tutorials.blogspot.com/2012/09/temporary-tables-in-sql-server-part-34.html
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Slides
http://csharp-video-tutorials.blogspot.com/2013/08/part-34-temporary-tables.html
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detail
{'title': 'Temporary tables in SQL Server Part 34', 'heatmap': [{'end': 50.431, 'start': 25.415, 'weight': 0.75}, {'end': 131.383, 'start': 110.447, 'weight': 0.705}, {'end': 236.395, 'start': 171.214, 'weight': 0.888}, {'end': 431.379, 'start': 417.468, 'weight': 1}, {'end': 494.07, 'start': 478.588, 'weight': 0.729}, {'end': 714.49, 'start': 697.221, 'weight': 0.778}, {'end': 858.696, 'start': 842.007, 'weight': 0.799}], 'summary': "Tutorial on 'temporary tables in sql server' covers the concept of temporary tables, including local and global types, creation, insertion, selection of data, automatic deletion, and creation in tempdb. it also delves into the specifics of local temporary tables, their creation, usage, and automatic drop behavior, as well as the distinction between local and global temporary tables in sql server.", 'chapters': [{'end': 113.177, 'segs': [{'end': 50.431, 'src': 'heatmap', 'start': 17.489, 'weight': 0, 'content': [{'end': 24.954, 'text': 'Permanent tables get created in the database we specify and they remain in that database permanently until we delete or drop them.', 'start': 17.489, 'duration': 7.465}, {'end': 32.159, 'text': 'On the other hand, temporary tables get created in the TemDB and are automatically deleted when they are no longer used.', 'start': 25.415, 'duration': 6.744}, {'end': 39.124, 'text': 'In SQL Server, there are two types of temporary tables, local temporary tables and global temporary tables.', 'start': 32.759, 'duration': 6.365}, {'end': 41.646, 'text': 'Now, what are permanent tables??', 'start': 40.185, 'duration': 1.461}, {'end': 50.431, 'text': "Now, let's say, if we are working with a sample database and when we expand tables folder, all the tables that you see here are permanent tables.", 'start': 42.199, 'duration': 8.232}], 'summary': 'Permanent tables remain in specified database; temporary tables get created in temdb and are automatically deleted when no longer used. sql server has local and global temporary tables.', 'duration': 24.157, 'max_score': 17.489, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI17489.jpg'}, {'end': 113.177, 'src': 'embed', 'start': 65.862, 'weight': 1, 'content': [{'end': 73.648, 'text': 'except that if you are creating a local temporary table, you prefix the name of the table with a single hash symbol.', 'start': 65.862, 'duration': 7.786}, {'end': 78.772, 'text': 'So the single hash symbol indicates that this person details is a temporary table.', 'start': 74.028, 'duration': 4.744}, {'end': 83.495, 'text': 'The rest of the syntax is very much similar to how we create a permanent table.', 'start': 79.212, 'duration': 4.283}, {'end': 85.104, 'text': 'All right.', 'start': 84.804, 'duration': 0.3}, {'end': 88.687, 'text': 'So this create table statement creates this temporary table.', 'start': 85.465, 'duration': 3.222}, {'end': 93.271, 'text': 'This insert statements populate data into the temporary table.', 'start': 89.268, 'duration': 4.003}, {'end': 96.394, 'text': 'And finally, we are selecting data from the temporary table.', 'start': 93.592, 'duration': 2.802}, {'end': 98.376, 'text': "So let's look at an example of that.", 'start': 96.694, 'duration': 1.682}, {'end': 100.438, 'text': 'So create table.', 'start': 98.916, 'duration': 1.522}, {'end': 102.96, 'text': "Let's execute this create statement.", 'start': 100.858, 'duration': 2.102}, {'end': 105.602, 'text': 'So obviously, it should create the temporary table.', 'start': 103.36, 'duration': 2.242}, {'end': 107.724, 'text': "Let's insert some data into that.", 'start': 106.203, 'duration': 1.521}, {'end': 109.526, 'text': 'Press F5.', 'start': 108.665, 'duration': 0.861}, {'end': 112.028, 'text': "And let's select the data from it.", 'start': 110.447, 'duration': 1.581}, {'end': 113.177, 'text': 'So look at this.', 'start': 112.537, 'duration': 0.64}], 'summary': 'Creating and using a temporary table with similar syntax to a permanent table, including insert and select operations.', 'duration': 47.315, 'max_score': 65.862, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI65862.jpg'}], 'start': 0.009, 'title': 'Sql server temporary tables', 'summary': 'Explains the concept of temporary tables in sql server, covering their types, local and global, and differences from permanent tables, as well as creation, insertion, and selection of data. it provides insights into automatic deletion and creation in the tempdb.', 'chapters': [{'end': 113.177, 'start': 0.009, 'title': 'Sql server temporary tables', 'summary': 'Explains the concept of temporary tables in sql server, including their types, local and global, and their differences from permanent tables, such as automatic deletion when no longer used and creation in the temdb. it also covers the creation, insertion, and selection of data from temporary tables.', 'duration': 113.168, 'highlights': ['Temporary tables are created in the TemDB and are automatically deleted when they are no longer used. Temporary tables are created in the TemDB and are automatically deleted when they are no longer used, distinguishing them from permanent tables.', 'Explanation of the types of temporary tables, local and global, and their creation using the create table command with a single hash symbol prefix for local temporary tables. The chapter explains the types of temporary tables, local and global, and their creation using the create table command with a single hash symbol prefix for local temporary tables, which distinguishes them from permanent tables.', 'Demonstration of creating, populating, and selecting data from a temporary table using create table, insert, and select statements. The chapter demonstrates the process of creating, populating, and selecting data from a temporary table using create table, insert, and select statements.']}], 'duration': 113.168, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI9.jpg', 'highlights': ['Temporary tables are created in the TemDB and are automatically deleted when they are no longer used, distinguishing them from permanent tables.', 'Explanation of the types of temporary tables, local and global, and their creation using the create table command with a single hash symbol prefix for local temporary tables.', 'Demonstration of creating, populating, and selecting data from a temporary table using create table, insert, and select statements.']}, {'end': 592.641, 'segs': [{'end': 236.395, 'src': 'heatmap', 'start': 168.253, 'weight': 0, 'content': [{'end': 170.254, 'text': 'where did this table get created?', 'start': 168.253, 'duration': 2.001}, {'end': 176.243, 'text': 'We know that From the first slide we understood temp tables are created in the tempdb.', 'start': 171.214, 'duration': 5.029}, {'end': 181.166, 'text': 'So we should be looking for local temporary tables in the tempdb database.', 'start': 176.564, 'duration': 4.602}, {'end': 188.431, 'text': 'So we expand system databases, and then tempdb, and then the temporary tables folder within the tempdb.', 'start': 181.587, 'duration': 6.844}, {'end': 191.092, 'text': 'Refresh the folder and look at this.', 'start': 188.971, 'duration': 2.121}, {'end': 195.515, 'text': 'We see the table that we have just created, the local temporary table.', 'start': 191.553, 'duration': 3.962}, {'end': 200.951, 'text': "OK So that's one way, graphically using the Object Explorer window.", 'start': 196.656, 'duration': 4.295}, {'end': 203.253, 'text': 'The other way is you can actually write this query.', 'start': 201.272, 'duration': 1.981}, {'end': 204.874, 'text': 'If you look at this, there is a query here.', 'start': 203.273, 'duration': 1.601}, {'end': 209.877, 'text': "We are querying the sysobjects system table that's present in the tempdb.", 'start': 205.454, 'duration': 4.423}, {'end': 214.741, 'text': 'So all the database objects that we create, like stored procedures, tables, functions, views,', 'start': 210.238, 'duration': 4.503}, {'end': 219.544, 'text': 'et cetera all this will be automatically inserted into sysobjects table.', 'start': 214.741, 'duration': 4.803}, {'end': 227.832, 'text': 'So we are querying the table to find is there a local temporary table with this name called PersonDetails?', 'start': 220.47, 'duration': 7.362}, {'end': 236.395, 'text': "So let's execute that query to select the name of the table that we have created the temporary table.", 'start': 229.173, 'duration': 7.222}], 'summary': 'Temp table created in tempdb; found using object explorer or query.', 'duration': 41.624, 'max_score': 168.253, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI168253.jpg'}, {'end': 328.992, 'src': 'embed', 'start': 287.251, 'weight': 2, 'content': [{'end': 293.996, 'text': "If you do an exact match using equals, and if you remove the wildcard at the end, look at what's going to happen.", 'start': 287.251, 'duration': 6.745}, {'end': 300.561, 'text': "It wouldn't return the result because there is no table in SysObjects table with person details alone.", 'start': 294.036, 'duration': 6.525}, {'end': 304.484, 'text': 'You have some random numbers at the end of the name of the temporary table.', 'start': 300.921, 'duration': 3.563}, {'end': 308.287, 'text': "That's why you will have to use the like keyword.", 'start': 304.804, 'duration': 3.483}, {'end': 312.83, 'text': 'OK? And that returns the name of the temporary table.', 'start': 310.588, 'duration': 2.242}, {'end': 316.188, 'text': 'So there are two ways to check if the local temporary table is created.', 'start': 313.527, 'duration': 2.661}, {'end': 324.251, 'text': "One is graphically using the object explorer vendor, but you'll have to go into the tempdb database and then expand temporary tables folder.", 'start': 316.388, 'duration': 7.863}, {'end': 328.992, 'text': 'And the other way is to obviously write the query against the sys objects system table.', 'start': 324.651, 'duration': 4.341}], 'summary': "Using 'like' instead of 'equals' returned the name of the temporary table. two ways to check for temporary table creation: graphically via object explorer or querying sys objects table.", 'duration': 41.741, 'max_score': 287.251, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI287251.jpg'}, {'end': 444.008, 'src': 'heatmap', 'start': 417.468, 'weight': 4, 'content': [{'end': 424.971, 'text': 'Why? Because local temporary tables are only available for the connection that has created that local temporary table, which is very important.', 'start': 417.468, 'duration': 7.503}, {'end': 431.379, 'text': 'And the local temporary table is automatically dropped when the connection that has created it is closed.', 'start': 425.655, 'duration': 5.724}, {'end': 435.222, 'text': 'So here, connection 1 created the local temporary table.', 'start': 431.779, 'duration': 3.443}, {'end': 444.008, 'text': 'So obviously, when this connection is closed, when I close this, this temporary table will be automatically dropped.', 'start': 435.562, 'duration': 8.446}], 'summary': 'Local temporary tables are only available for the creating connection and are automatically dropped when the connection is closed.', 'duration': 26.54, 'max_score': 417.468, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI417468.jpg'}, {'end': 507.537, 'src': 'heatmap', 'start': 478.588, 'weight': 5, 'content': [{'end': 487.205, 'text': 'Now, another important point to keep in mind is that If you create a temporary table as part of a stored procedure,', 'start': 478.588, 'duration': 8.617}, {'end': 494.07, 'text': 'then that temporary table gets dropped automatically upon the completion of stored procedure execution.', 'start': 487.947, 'duration': 6.123}, {'end': 498.472, 'text': 'So if you look at this example here, we have a stored procedure called SPCreateLocalTempTable.', 'start': 494.09, 'duration': 4.382}, {'end': 500.053, 'text': 'And what is this procedure doing??', 'start': 498.833, 'duration': 1.22}, {'end': 507.537, 'text': "It's creating a table called HashPersonDetailsLocalTemporaryTable, populating that with some data and selecting data back from that.", 'start': 500.093, 'duration': 7.444}], 'summary': 'Creating temporary table in stored procedure automatically drops upon completion.', 'duration': 50.715, 'max_score': 478.588, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI478588.jpg'}], 'start': 113.457, 'title': 'Local temporary tables in sql', 'summary': 'Covers the creation and usage of local temporary tables in sql server, including methods to check their creation, querying sysobjects, connection restrictions, and automatic drop behavior.', 'chapters': [{'end': 263.05, 'start': 113.457, 'title': 'Checking creation of temporary tables', 'summary': 'Explains how to check if a local temporary table is successfully created in sql server, demonstrating the process through both graphical and query-based methods, using examples and database context.', 'duration': 149.593, 'highlights': ['Local temporary tables are created in the tempdb database in SQL Server. The chapter emphasizes that local temporary tables are created in the tempdb database in SQL Server, providing a key understanding of the location for such tables.', 'Demonstrates visually checking for the local temporary table using Object Explorer window in SQL Server Management Studio. The chapter demonstrates visually checking for the local temporary table using Object Explorer window in SQL Server Management Studio, providing a practical approach for verification.', 'Shows querying the sysobjects system table in tempdb to verify the existence of the local temporary table. The chapter illustrates querying the sysobjects system table in tempdb to verify the existence of the local temporary table, presenting a method for programmatically confirming the creation.']}, {'end': 592.641, 'start': 263.05, 'title': 'Local temporary tables in sql', 'summary': "Explains the usage and behavior of local temporary tables in sql server, highlighting the need to use 'like' instead of 'equals' when querying sysobjects, the restriction of local temporary tables to the connection that created them, and their automatic drop when the creating connection is closed or when created within a stored procedure.", 'duration': 329.591, 'highlights': ["The need to use 'like' instead of 'equals' when querying sysobjects to retrieve local temporary tables, as an exact match using equals and removing the wildcard would result in no table return due to the random numbers appended at the end of the table name (Quantifiable data: explanation of why 'like' is necessary for retrieving local temporary tables from sysobjects).", 'The restriction of local temporary tables to the connection that has created them, as they are only available for the connection that created the table, with an example demonstrating the inability of a second connection to find and access a local temporary table created by the first connection (Quantifiable data: demonstration of the restriction of local temporary tables to the creating connection).', 'The automatic drop of local temporary tables when the connection that has created them is closed, with a demonstration showing the automatic drop of a local temporary table upon the closure of the connection that created it (Quantifiable data: demonstration of the automatic drop of local temporary tables upon closure of creating connection).', 'The automatic drop of local temporary tables created within a stored procedure upon the completion of the stored procedure execution, as demonstrated by the creation, population, retrieval of data, and immediate destruction of a temporary table created within a stored procedure upon its execution (Quantifiable data: demonstration of the automatic drop of local temporary tables created within a stored procedure).']}], 'duration': 479.184, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI113457.jpg', 'highlights': ['Local temporary tables are created in the tempdb database in SQL Server, providing a key understanding of the location for such tables.', 'Demonstrates visually checking for the local temporary table using Object Explorer window in SQL Server Management Studio, providing a practical approach for verification.', 'Shows querying the sysobjects system table in tempdb to verify the existence of the local temporary table, presenting a method for programmatically confirming the creation.', "The need to use 'like' instead of 'equals' when querying sysobjects to retrieve local temporary tables, as an exact match using equals and removing the wildcard would result in no table return due to the random numbers appended at the end of the table name.", 'The restriction of local temporary tables to the connection that has created them, with an example demonstrating the inability of a second connection to find and access a local temporary table created by the first connection.', 'The automatic drop of local temporary tables when the connection that has created them is closed, with a demonstration showing the automatic drop of a local temporary table upon the closure of the connection that created it.', 'The automatic drop of local temporary tables created within a stored procedure upon the completion of the stored procedure execution, as demonstrated by the creation, population, retrieval of data, and immediate destruction of a temporary table created within a stored procedure upon its execution.']}, {'end': 915.565, 'segs': [{'end': 696.341, 'src': 'embed', 'start': 671.909, 'weight': 3, 'content': [{'end': 678.429, 'text': 'If they accidentally happen to create a temporary table with the same name, a local temporary table with the same name as that of the other user,', 'start': 671.909, 'duration': 6.52}, {'end': 680.11, 'text': 'you still have no problem,', 'start': 678.429, 'duration': 1.681}, {'end': 691.017, 'text': 'because SQL Server appends a random number which is basically used to differentiate between the different tables created across different connections.', 'start': 680.11, 'duration': 10.907}, {'end': 694.079, 'text': 'All right.', 'start': 693.699, 'duration': 0.38}, {'end': 696.341, 'text': 'So global temporary tables.', 'start': 694.88, 'duration': 1.461}], 'summary': 'Sql server appends random numbers to differentiate same-name temporary tables.', 'duration': 24.432, 'max_score': 671.909, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI671909.jpg'}, {'end': 721.276, 'src': 'heatmap', 'start': 697.221, 'weight': 0.778, 'content': [{'end': 705.743, 'text': 'A global temporary table basically is very much similar to a local temporary table except that it has got two pound symbols in its name.', 'start': 697.221, 'duration': 8.522}, {'end': 714.49, 'text': 'So instead of one prefix and one hash sign, you can actually prefix that with two hash signs.', 'start': 707.024, 'duration': 7.466}, {'end': 716.972, 'text': "So let's prefix that with two hash signs.", 'start': 714.851, 'duration': 2.121}, {'end': 721.276, 'text': "And let's give it a name called employee details, for example.", 'start': 717.313, 'duration': 3.963}], 'summary': 'Global temporary table has two pound symbols in its name.', 'duration': 24.055, 'max_score': 697.221, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI697221.jpg'}, {'end': 781.526, 'src': 'embed', 'start': 752.659, 'weight': 1, 'content': [{'end': 755.74, 'text': 'I am able to select that here in the second connection window.', 'start': 752.659, 'duration': 3.081}, {'end': 763.342, 'text': 'And if I do the same thing in the first connection window, I will still be able to do that because look at this ID name.', 'start': 756.66, 'duration': 6.682}, {'end': 765.522, 'text': "There's no data, so we don't see any rows there.", 'start': 763.362, 'duration': 2.16}, {'end': 767.583, 'text': "But still, I'm able to access that table.", 'start': 765.802, 'duration': 1.781}, {'end': 771.704, 'text': 'So global temporary tables are prefixed with two pound signs.', 'start': 767.943, 'duration': 3.761}, {'end': 774.044, 'text': 'And they are visible for all the connections.', 'start': 772.044, 'duration': 2}, {'end': 781.526, 'text': 'And these global temporary tables are only destroyed when the last connection referencing the table is closed.', 'start': 775.785, 'duration': 5.741}], 'summary': 'Global temporary tables are prefixed with two pound signs and are visible for all connections. they are destroyed when the last referencing connection is closed.', 'duration': 28.867, 'max_score': 752.659, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI752659.jpg'}, {'end': 868.702, 'src': 'heatmap', 'start': 842.007, 'weight': 0.799, 'content': [{'end': 848.25, 'text': 'this is one of the common interview questions that is asked what is the difference between local temporary tables and global temporary tables?', 'start': 842.007, 'duration': 6.243}, {'end': 851.972, 'text': "And if you have been following along until now, it's very clear.", 'start': 848.611, 'duration': 3.361}, {'end': 858.696, 'text': 'Local temporary tables are prefixed with single pound symbol, whereas global temporary tables are prefixed with two hash symbols.', 'start': 852.373, 'duration': 6.323}, {'end': 868.702, 'text': 'And SQL Server appends some random numbers at the end of the local temporary table name, whereas this is not done for the global temp tables.', 'start': 860.237, 'duration': 8.465}], 'summary': 'Local temp tables: single pound symbol, global temp tables: two hash symbols.', 'duration': 26.695, 'max_score': 842.007, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI842007.jpg'}, {'end': 906.282, 'src': 'embed', 'start': 875.983, 'weight': 0, 'content': [{'end': 881.004, 'text': 'whereas global temporary tables are visible across all sessions, all connections, all users.', 'start': 875.983, 'duration': 5.021}, {'end': 887.566, 'text': 'And local temporary tables are automatically dropped when the session that created the temporary table is closed,', 'start': 882.024, 'duration': 5.542}, {'end': 894.948, 'text': 'whereas global temporary tables are destroyed when the last connection that is referencing the global temp table is closed.', 'start': 887.566, 'duration': 7.382}, {'end': 900.56, 'text': 'So these are some of the common differences between local and global temporary tables.', 'start': 895.438, 'duration': 5.122}, {'end': 906.282, 'text': 'On this slide, you can find resources for ASP.NET and C Sharp interview questions.', 'start': 902.761, 'duration': 3.521}], 'summary': 'Global temporary tables are visible across all sessions, connections, and users, while local temporary tables are dropped when the creating session is closed. asp.net and c sharp interview resources are also provided.', 'duration': 30.299, 'max_score': 875.983, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI875983.jpg'}], 'start': 592.661, 'title': 'Temporary and global tables in sql', 'summary': 'Discusses the concept of local and global temporary tables in sql server, highlighting unique naming conventions, and visibility across connections. it also emphasizes the distinction between local and global temporary tables, where global temporary tables are visible across all sessions and connections, while local temporary tables are only visible to the session that created them.', 'chapters': [{'end': 796.004, 'start': 592.661, 'title': 'Temporary tables in sql server', 'summary': 'Discusses the concept of local and global temporary tables in sql server, highlighting the unique naming convention and visibility across connections, and emphasizing the distinction between local and global temporary tables.', 'duration': 203.343, 'highlights': ['SQL Server uses random numbers to differentiate between local temporary tables created for different users, ensuring no conflict even if tables have the same name.', 'Global temporary tables, identified by a double pound symbol, are visible across all connections and are only destroyed when the last connection referencing the table is closed.', 'The chapter demonstrates the unique naming convention of temporary tables, with local tables having a single prefix and hash sign, while global tables have a double hash symbol as a prefix.']}, {'end': 915.565, 'start': 796.364, 'title': 'Global vs local temporary tables', 'summary': 'Discusses the differences between local and global temporary tables in sql server, highlighting that global temporary tables are visible across all sessions and connections, while local temporary tables are only visible to the session that created them and are automatically dropped when the session is closed.', 'duration': 119.201, 'highlights': ['Global temporary tables are visible across all sessions, all connections, all users, while local temporary tables are only visible to the session that created it.', 'Local temporary tables are automatically dropped when the session that created it is closed, whereas global temporary tables are destroyed when the last connection referencing it is closed.', 'The difference between local and global temporary tables lies in their naming conventions, with local temporary tables prefixed with a single pound symbol and global temporary tables prefixed with two hash symbols, with SQL Server appending random numbers at the end of the local temporary table name but not for the global temp tables.']}], 'duration': 322.904, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/oGuS1rdfaMI/pics/oGuS1rdfaMI592661.jpg', 'highlights': ['Global temporary tables are visible across all sessions, all connections, all users, while local temporary tables are only visible to the session that created it.', 'Global temporary tables, identified by a double pound symbol, are visible across all connections and are only destroyed when the last connection referencing the table is closed.', 'Local temporary tables are automatically dropped when the session that created it is closed, whereas global temporary tables are destroyed when the last connection referencing it is closed.', 'SQL Server uses random numbers to differentiate between local temporary tables created for different users, ensuring no conflict even if tables have the same name.']}], 'highlights': ['Temporary tables are created in the TemDB and are automatically deleted when they are no longer used, distinguishing them from permanent tables.', 'Explanation of the types of temporary tables, local and global, and their creation using the create table command with a single hash symbol prefix for local temporary tables.', 'Demonstration of creating, populating, and selecting data from a temporary table using create table, insert, and select statements.', 'Local temporary tables are created in the tempdb database in SQL Server, providing a key understanding of the location for such tables.', 'Demonstrates visually checking for the local temporary table using Object Explorer window in SQL Server Management Studio, providing a practical approach for verification.', 'Shows querying the sysobjects system table in tempdb to verify the existence of the local temporary table, presenting a method for programmatically confirming the creation.', "The need to use 'like' instead of 'equals' when querying sysobjects to retrieve local temporary tables, as an exact match using equals and removing the wildcard would result in no table return due to the random numbers appended at the end of the table name.", 'The restriction of local temporary tables to the connection that has created them, with an example demonstrating the inability of a second connection to find and access a local temporary table created by the first connection.', 'The automatic drop of local temporary tables when the connection that has created them is closed, with a demonstration showing the automatic drop of a local temporary table upon the closure of the connection that created it.', 'The automatic drop of local temporary tables created within a stored procedure upon the completion of the stored procedure execution, as demonstrated by the creation, population, retrieval of data, and immediate destruction of a temporary table created within a stored procedure upon its execution.', 'Global temporary tables are visible across all sessions, all connections, all users, while local temporary tables are only visible to the session that created it.', 'Global temporary tables, identified by a double pound symbol, are visible across all connections and are only destroyed when the last connection referencing the table is closed.', 'Local temporary tables are automatically dropped when the session that created it is closed, whereas global temporary tables are destroyed when the last connection referencing it is closed.', 'SQL Server uses random numbers to differentiate between local temporary tables created for different users, ensuring no conflict even if tables have the same name.']}