SQL COUNT(column_name) 语法

衣舞晨风发布时间：2014-01-08 09:40:48 ，浏览量：3

COUNT(column_name) 函数返回指定列的值的数目（NULL 不计入）

COUNT(*) 函数返回表中的记录数

计算一个表中有几行数据：

select count(*) from 表名;

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SQL COUNT(column_name) 语法

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