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Local temp tables are only available to the SQL Server session or connection (means single user) that created the tables. These are automatically deleted when the session that created the tables has been closed. Local temporary table name is stared with single hash ("#") sign. CREATE TABLE #LocalTemp.
You can create a Local Temporary Table with the same name but in a different connection, and it is stored with the same name along with various random values. " ##tempTable " denotes Global Temporary Tables. It starts with the single hash value "##" as the prefix of the table name and its name is always unique.
Differences between Temporary Tables (##temp/#temp) and Table Variables (@table) are as: Table variable (@table) is created in the memory. Whereas, a Temporary table (##temp/#temp) is created in the tempdb database. However, if there is a memory pressure the pages belonging to a table variable may be pushed to tempdb.
If you need to 'see' the list of temporary tables, you could simply log the names used. (and as others have noted, it is possible to directly query this information) If you need to 'see' the content of temporary tables, you will need to create real tables with a (unique) temporary name. You can trace the SQL being executed using SQL Profiler:
141. #table refers to a local (visible to only the user who created it) temporary table. ##table refers to a global (visible to all users) temporary table. @variableName refers to a variable which can hold values depending on its type. Your definition of #table is not totally correct.
10. You can create temporary tables by prefixing the table name with # or ##. Single # temporary tables are specific to the connection and session (aka who created it). Double ## temporary tables global and can be seen and used by other connections too. The latter goes away when all the connections using it are closed.
A (non recursive) CTE is treated very similarly to other constructs that can also be used as inline table expressions in SQL Server. Derived tables, Views, and inline table valued functions. Note that whilst BOL says that a CTE "can be thought of as temporary result set" this is a purely logical description.
Local temporary tables are visible only in the current session, and global temporary tables are visible to all sessions. '#table_temporal '##table_global. If a local temporary table is created in a stored procedure or application that can be executed at the same time by several users, the Database Engine must be able to distinguish the tables ...
Temporary tables are stored in the TempDB database. Per Microsoft: TempDB system database is a global resource that is available to all users connected to the instance of SQL Server or connected to SQL Database –
The ## is one that is the same as the #, however, the scope is wider, so you can use it within the same session, within other stored procedures. You can create a temp table in various ways: declare @table table (id int) create table #table (id int) create table ##table (id int) select * into #table from xyz. answered Mar 26, 2017 at 9:02.