What is VAR () in SQL Server?

What is VAR function in SQL?

VAR is a deterministic function when used without the OVER and ORDER BY clauses. It is nondeterministic when specified with the OVER and ORDER BY clauses. For more information, see Deterministic and Nondeterministic Functions.

How do you calculate variance in SQL Server?

VAR ( [ ALL | DISTINCT ] column name or expression ) – This function is used to compute statistical variance from sample data. VARP( [ ALL | DISTINCT ] column name or expression ) – This function is used to compute statistical variance for an entire population data.

How DECLARE variable in SQL query?

Firstly, if we want to use a variable in SQL Server, we have to declare it. The DECLARE statement is used to declare a variable in SQL Server. In the second step, we have to specify the name of the variable. Local variable names have to start with an at (@) sign because this rule is a syntax necessity.

Can you use variables in SQL?

Variables in SQL procedures are defined by using the DECLARE statement. Values can be assigned to variables using the SET statement or the SELECT INTO statement or as a default value when the variable is declared. Literals, expressions, the result of a query, and special register values can be assigned to variables.