LAG()

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

  • Present starting in MariaDB Enterprise Server 10.6.4-1.

10.6 Community

  • Present starting in MariaDB Community Server 10.6.0.

10.5 Enterprise

  • Present starting in MariaDB Enterprise Server 10.5.3-1.

10.5 Community

  • Present starting in MariaDB Community Server 10.5.0.

10.4 Enterprise

  • Present starting in MariaDB Enterprise Server 10.4.6-1.

10.4 Community

  • Present starting in MariaDB Community Server 10.4.0.

10.3 Enterprise

  • Present starting in MariaDB Enterprise Server 10.3.16-1.

10.3 Community

  • Present starting in MariaDB Community Server 10.3.0.

10.2 Enterprise

  • Present starting in MariaDB Enterprise Server 10.2.25-1.

10.2 Community

  • Added in MariaDB Community Server 10.2.2.

EXTERNAL REFERENCES