What is a computed column in SQL Server?
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Simply so, is persisted in SQL computed column meaning?
Computed columns can be persisted. It means that SQL Server physically stores the data of the computed columns on disk. When you change data in the table, SQL Server computes the result based on the expression of the computed columns and stores the results in these persisted columns physically.
One may also ask, what does persisted mean in SQL? PERSISTED. Specifies that the Database Engine will physically store the computed values in the table, and update the values when any other columns on which the computed column depends are updated.
Secondly, how do you make a calculation in SQL?
When you need to perform calculations in SQL statement, you use arithmetic expression. An arithmetic expression can contain column names, numeric numbers, and arithmetic operators.
Which comparison operators can you use in a where clause?
Comparison operators are used to test the equality of two input expressions. They are typically used in the WHERE clause of a query. a is equal to b .