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13 mar 2014 · There is no way to declare a global variable in Transact-SQL. However, if all you want your variables for is to be accessible across batches of a single script, you can use the SQLCMD tool or the SQLCMD mode of SSMS and define that tool/mode-specific variables like this:
19 sie 2020 · Global variables are pre-defined system variables. It starts with @@. It provides information about the present user environment for SQL Server. SQL Server provides multiple global variables, which are very effective to use in Transact-SQL.
8 lip 2024 · Although in earlier versions of SQL Server, the @@ functions are referred to as global variables, @@ functions aren't variables, and they don't have the same behaviors as variables. The @@ functions are system functions, and their syntax usage follows the rules for functions.
19 sie 2009 · All the global variables represent information specific to the server or a current user session. Global variable names begin with a @@ prefix. You do not need to declare them, since the server constantly maintains them. They are system-defined functions and you cannot declare them.
The first thing to know about global variables in SQL is that they aren't variables (for these, read my separate tutorial). Instead, they are useful bits of infomation made available by SQL Server, which you can use. All global variables start with @@; all normal variables start with @.
28 cze 2024 · Global variable. The system maintains the global variable. A user cannot declare them. The global variable starts with @@ It stores session related information. How to DECLARE a variable in SQL. Before using any variable in batch or procedure, you need to declare the variable.
SQL Server has no global variables. If you want to make something available to all sessions, use a table and write the data there. Another option is persisting the data in a global temporary table (prefixed with two # signs).
