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table variables aren't supported in the SQL Server optimizer's cost-based reasoning model.

As such, they shouldn't be used when cost-based choices are required to achieve an efficient query plan.

To declare variables of type table, use DECLARE @local_variable.

Applies to: SQL Server (SQL Server 2008 through SQL Server 2017), Azure SQL Database.

Is there any difference between using WHERE and something like the following?

Transact-SQL Syntax Conventions Is the same subset of information that is used to define a table in CREATE TABLE.

The table declaration includes column definitions, names, data types, and constraints.

Since you can't list more than one table in the Oracle UPDATE statement, you can use the Oracle EXISTS clause.

I would like to be able to use a table variable in the same manner as a cursor.

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