You CANNOT use temp tables in User Defined Functions (UDF).If you want to use explicit transactions against the temporary data.When the user or connection which creates them alone can use it.If the size of the temporary data is huge, say more than 100 rows.INSERT INTO #EmployeeLocal values ( 235, 'John Doe','Minneapolis, MN', '') So only SQL user/connection which created the temp table alone can use it. Once the stored procedure finishes execution, the hash table drops automatically from the TempDB. if you create a hash table in a stored procedure, then the table will be available only for that stored procedure or any other nested stored procedures called from inside that stored procedure. These local temp tables are available only in the current session. The local temp table’s name is prefixed with single number sign (#) (Example: #TableName). This classification is based on the scope of their existence. Temporary tables are of two types, Local Temporary Tables and Global Temporary Tables. another limitation of temp table compared with their physical counterpart is that they cannot be partitioned.
The name of the temp tables can have a maximum of 116 characters. They are stored in the TempDB and will get dropped automatically after the scope. As the name suggests, temp tables are available only in the scope where they are created. The temporary tables are created during the execution time.
Temp tables are otherwise called as hash tables or temporary tables.The name of the temp table starts with single number sign (#) or double number sign (#).
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