What is difference between table variable and temporary table?

Table variable can be used by the current user only. Temp table will be stored in the tempdb. Table variable will store in the physical memory for some of the data, then later when the size increases it will be moved to the tempdb. Temp table can do all the DDL operations.

What is the difference between a local temporary table and a global temporary table How is each one used?

Local temporary tables are deleted after the user disconnects from the instance of SQL Server. Global temporary tables are visible to any user and any connection after they are created, and are deleted when all users that are referencing the table disconnect from the instance of SQL Server.

What is difference between @table and #table in SQL Server?

# and ## tables are actual tables represented in the temp database. These tables can have indexes and statistics, and can be accessed across sprocs in a session (in the case of a global temp table, it is available across sessions). The @table is a table variable.

What is a variable table?

A variable table is an object that groups multiple variables. All the global parameters (now named variables) that you use in workload scheduling are contained in at least one variable table.

What is a global temporary table?

The DECLARE GLOBAL TEMPORARY TABLE statement defines a temporary table for the current connection. These tables do not reside in the system catalogs and are not persistent. Temporary tables exist only during the connection that declared them and cannot be referenced outside of that connection.

How do I know if a table is a global temporary table?

We can also use the following query to display all Oracle global temporary tables: select table_name from all_tables where temporary = ‘Y’;

What is temporary table and temporary variable in SQL Server?

Temp Variables in SQL Server. Temp Variables are also used for holding data temporarily just like a temp table. This acts like a variable and exists for a specific batch of query execution. It is dropped once it comes out of the batch. Temp Variables are also created in the Tempdb database but not the memory.