How Can I Declare and Use Global Variables Across Multiple SQL Server Queries and Databases?

Declaring Global Variables in SQL Server

In SQL Server, declaring global variables across multiple queries and databases can be a challenge. While you may attempt to use the DECLARE statement, it often results in errors as shown in your example.

One possible solution is to utilize the SQLCMD tool or the SQLCMD mode within SSMS. These environments allow you to define tool-specific variables that can be accessed throughout a single script's batches.

To define a variable in SQLCMD/SQLCMD mode, use the following syntax:

:setvar myvar 10

Once defined, you can use the variable by referencing it with a dollar sign ($):

$(myvar)

To activate SQLCMD mode in SSMS, follow these steps:

1. Open SSMS.
2. Click on "Query" > "New Query Window with SQLCMD Mode."
3. The status bar at the bottom of the window will indicate that SQLCMD mode is active.

Using SQLCMD/SQLCMD mode variables provides a convenient way to share values across queries and databases without the limitations of local variables.

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