Error: “Must declare the scalar variable” for insert statements in multiple database

Question

I created a SQL script to add an entry in different database. However, when I run the script through SQL Server Management Studio.

declare @address varchar(50)
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Answer 1

It's because you are using go between the statement that declares the variable and the statement that uses it.

The go command is not an SQL command, it's a separator between sessions in Management Studio. Just remove all the go commands in your query, and you can use the variable all the way.