LAG()

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, 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.

Release Series

History

10.6 Enterprise

  • Present starting in MariaDB Enterprise Server 10.6.4-1.

10.5 Enterprise

  • Present starting in MariaDB Enterprise Server 10.5.3-1.

10.4 Enterprise

  • Present starting in MariaDB Enterprise Server 10.4.6-1.

EXTERNAL REFERENCES