LAG()
This page is part of MariaDB's Enterprise Documentation.
The parent of this page is: Functions
Topics on this page:
Overview
A description for this Function has not yet been added to this Documentation.
See also: Functions in 10.6 ES, in 10.6 CS, in 10.5 ES, in 10.5 CS, in 10.4 ES, in 10.4 CS, in 10.3 ES, in 10.3 CS, in 10.2 ES, and in 10.2 CS
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, b,
LAG(b) OVER w AS 'lag',
LEAD(b) OVER w AS 'lead',
a - LAG(b) OVER w AS 'lag diff',
a - LEAD(b) OVER w AS 'lead diff'
FROM t1
WINDOW w AS (ORDER BY a, b);
+------+------+------+------+----------+-----------+
| a | b | lag | lead | lag diff | lead diff |
+------+------+------+------+----------+-----------+
| 1 | 3 | NULL | 5 | NULL | -4 |
| 1 | 5 | 3 | 6 | -2 | -5 |
| 2 | 6 | 5 | 9 | -3 | -7 |
| 3 | 9 | 6 | 9 | -3 | -6 |
| 3 | 9 | 9 | 8 | -6 | -5 |
| 4 | 8 | 9 | 6 | -5 | -2 |
| 5 | 6 | 8 | 7 | -3 | -2 |
| 5 | 7 | 6 | 4 | -1 | 1 |
| 6 | 4 | 7 | 2 | -1 | 4 |
| 7 | 2 | 4 | 5 | 3 | 2 |
| 7 | 5 | 2 | 2 | 5 | 5 |
| 8 | 2 | 5 | 5 | 3 | 3 |
| 9 | 5 | 2 | 10 | 7 | -1 |
| 9 | 10 | 5 | 1 | 4 | 8 |
| 10 | 1 | 10 | NULL | 0 | NULL |
+------+------+------+------+----------+-----------+
CHANGE HISTORY
Release Series | History |
---|---|
10.6 Enterprise |
|
10.6 Community |
|
10.5 Enterprise |
|
10.5 Community |
|
10.4 Enterprise |
|
10.4 Community |
|
10.3 Enterprise |
|
10.3 Community |
|
10.2 Enterprise |
|
10.2 Community |
|
EXTERNAL REFERENCES
Additional information on this topic may be found in the MariaDB Public Knowledge Base.
Information specific to MariaDB SkySQL can be found on the LAG() page in the SkySQL Documentation.