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VARIANCE
Aggregate function. Calculates the population variance value from a set of numbers. VARIANCE has synonym VAR_POP which is equivalent. VARIANCE returns NULL if there are not matching rows.
Syntax
VARIANCE ( expression )
Arguments
- expression: any expression. This may be a column name, the result of another function, or a math operation.
Return Type
A double.
Examples
SELECT VARIANCE(table_rows) FROM information_schema.tables;
+----------------------+
| VARIANCE(table_rows) |
+----------------------+
| 2.1500 |
+----------------------+
1 row in set (2.87 sec)
