VAR_SAMP()
This page is part of MariaDB's Documentation.
The parent of this page is: Functions for MariaDB Enterprise Server
Topics on this page:
Overview
A description for this Function has not yet been added to this Documentation.
EXAMPLES
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES
(1,3), (1,5), (8,2), (5,7), (5,6),
(10,1), (6,4), (3,9), (3,9), (7,2),
(7,5), (2,6), (9,10), (9,5), (4,8);
SELECT a, VAR_SAMP(b) AS var_b
FROM t1 GROUP BY a ORDER BY a;
+------+---------+
| a | var_b |
+------+---------+
| 1 | 2.0000 |
| 2 | NULL |
| 3 | 0.0000 |
| 4 | NULL |
| 5 | 0.5000 |
| 6 | NULL |
| 7 | 4.5000 |
| 8 | NULL |
| 9 | 12.5000 |
| 10 | NULL |
+------+---------+
As Window Function
SELECT a, VAR_SAMP(a) OVER (PARTITION BY b) AS var_samp_a
FROM t1
GROUP BY a
ORDER BY a;
+------+------------+
| a | var_samp_a |
+------+------------+
| 1 | NULL |
| 2 | NULL |
| 3 | NULL |
| 4 | NULL |
| 5 | NULL |
| 6 | NULL |
| 7 | 0.5000 |
| 8 | 0.5000 |
| 9 | NULL |
| 10 | NULL |
+------+------------+
CHANGE HISTORY
EXTERNAL REFERENCES
Additional information on this topic may be found in the MariaDB Public Knowledge Base.