How Can I Use Global Variables Across Different SQL Server Databases?

Declaring Global Variables in SQL Server

Problem:

A developer encounters an error when attempting to declare and use global variables across different databases within a single Transact-SQL script. The error indicates that the scalar variable "@GLOBAL_VAR_2" is not declared.

Solution:

Transact-SQL does not support the concept of global variables. However, there is a workaround using the SQLCMD tool or the SQLCMD mode of SSMS.

In SQLCMD or SQLCMD mode, you can define tool-specific variables using the ":setvar" command:

:setvar myvar 10

Once defined, these variables can be used within the script using the "$(variable-name)" syntax:

$(myvar)

To use SQLCMD mode in SSMS, select the "Start SQLCMD mode (Ctrl 1)" option from the Query menu.

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