"A traditional table variable represents a table in the tempdb database. Table variables are not in-memory constructs. Type of Variables in SQL Server Local variable: A user declares the local variable. All the name of table variable in T - SQL start with at sign (@). Use following queries for this: Transact SQL is also known as T-SQL. Variable names must be unique within a query batch or stored procedure. SQL Declare variable table Declare variable table. The query which works fine with temporary table does not work with table variables. Table variables cannot be dropped, nor can they be re-declared. Table Variable. Example. Every local variable scope has the restriction to the current batch or procedure within any given session. T-SQL supports many feature like variables, loops, conditions and exceptions. DECLARE statement is used to create a table variable. By default, a local variable starts with @. When executed the update finished in 2 minutes. 1 It is created in the memory database but may be pushed out to tempdb. The data type of a column defines what value the column can hold: integer, character, money, date and time, binary, and so on. Global variable: To declare a table variable, use the DECLARE keyword, then type the @variable_name and variable type table with columns. At any point of time, the Table Variable will also contain 1000 to 3000 rows. Table variables are SQL Server local variables, but they also have some properties that resemble temp tables. SQL Prompt implements this recomendation as a code analysis rule, ST011 – Consider using table variable instead of temporary table. I replaced the Cursor and used Table Variable. In fact, trying to do the latter returns this error: “The variable name ‘@country’ has already been declared. It gets dropped once it comes out of batch. In order to use the in-memory technology you have to explicitly define a TYPE which is memory optimized and use that TYPE to define your table variable. Table variable is used to store an entire result set rather than a single value. Below figure explain two types of variable available in MS SQL server. Let us confirm this with following example: First create 2 temporary variables. Use Table variable, if you have less than 1000 rows otherwise go for Temporary tables. Yesterday I come across a strange issue while I was trying to use update query with table variable. Solution 1: Define Variable Table This is a very simple solution, first, define a table variable and right after that insert the data into it. will return Cannot find a table or object with the name “@country”. I want to know whether to replace Table Variable with #TempTable? Because a table variable is a type of local variable, T-SQL scripts do not create table variables with a create table statement. Table Variable acts like a variable and exists for a particular batch of query execution. For much faster performance you can memory-optimize your table variable." There are two different solution/workaround to this problem. Table Variable Table variables are also temporary objects and they are created as with DECLARE keywords. The reason is very simple, you can’t just insert the data into the table variable on the fly. Check the system catalog. Even if you replace the table variable with SQL, it will greatly speed up query performance: select * from (Select 10377 as UserID Union all Select 73736 Union all Select 7474748 ….) Once you have successfully created a table variable, you can query the same table variable via following select statement. To insert values into a table variable, uses the INSERT statement based on a SELECT statement. 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