GREATEST
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