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ZhangYu0123 1d9b3aeee7 [Doc] Repair document format (#4336 )

The error format '##keyword' in a lot of docs. This pr is to repair document format. #4335

2020-08-13 23:39:41 +08:00

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title, language

title	language
timediff	zh-CN

timediff

description

Syntax

TIME TIMEDIFF(DATETIME expr1, DATETIME expr2)

TIMEDIFF返回两个DATETIME之间的差值

TIMEDIFF函数返回表示为时间值的expr1 - expr2的结果，返回值为TIME类型

example

mysql> SELECT TIMEDIFF(now(),utc_timestamp());
+----------------------------------+
| timediff(now(), utc_timestamp()) |
+----------------------------------+
| 08:00:00                         |
+----------------------------------+

mysql> SELECT TIMEDIFF('2019-07-11 16:59:30','2019-07-11 16:59:21');
+--------------------------------------------------------+
| timediff('2019-07-11 16:59:30', '2019-07-11 16:59:21') |
+--------------------------------------------------------+
| 00:00:09                                               |
+--------------------------------------------------------+

mysql> SELECT TIMEDIFF('2019-01-01 00:00:00', NULL);
+---------------------------------------+
| timediff('2019-01-01 00:00:00', NULL) |
+---------------------------------------+
| NULL                                  |
+---------------------------------------+

keyword

TIMEDIFF

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