1d9b3aeee7
The error format '##keyword' in a lot of docs. This pr is to repair document format. #4335
1.5 KiB
Executable File
1.5 KiB
Executable File
title, language
| title | language |
|---|---|
| COUNT | zh-CN |
COUNT
description
Syntax
COUNT([DISTINCT] expr)
用于返回满足要求的行的数目
example
MySQL > select count(*) from log_statis group by datetime;
+----------+
| count(*) |
+----------+
| 28515903 |
+----------+
MySQL > select count(datetime) from log_statis group by datetime;
+-------------------+
| count(`datetime`) |
+-------------------+
| 28521682 |
+-------------------+
MySQL > select count(distinct datetime) from log_statis group by datetime;
+-------------------------------+
| count(DISTINCT `datetime`) |
+-------------------------------+
| 71045 |
+-------------------------------+
keyword
COUNT