GREATEST

description

Syntax

greatest(col_a, col_b, …, col_n)

column支持以下类型：TINYINT SMALLINT INT BIGINT LARGEINT FLOAT DOUBLE STRING DATETIME DECIMAL

比较n个column的大小返回其中的最大值.若column中有NULL，则返回NULL.

example

mysql> select greatest(-1, 0, 5, 8);
+-----------------------+
| greatest(-1, 0, 5, 8) |
+-----------------------+
|                     8 |
+-----------------------+
mysql> select greatest(-1, 0, 5, NULL);
+--------------------------+
| greatest(-1, 0, 5, NULL) |
+--------------------------+
| NULL                     |
+--------------------------+
mysql> select greatest(6.3, 4.29, 7.6876);
+-----------------------------+
| greatest(6.3, 4.29, 7.6876) |
+-----------------------------+
|                      7.6876 |
+-----------------------------+
mysql> select greatest("2022-02-26 20:02:11","2020-01-23 20:02:11","2020-06-22 20:02:11");
+-------------------------------------------------------------------------------+
| greatest('2022-02-26 20:02:11', '2020-01-23 20:02:11', '2020-06-22 20:02:11') |
+-------------------------------------------------------------------------------+
| 2022-02-26 20:02:11                                                           |
+-------------------------------------------------------------------------------+

keywords

GREATEST

FLOOR LEAST