select count(*) from 怎么使用
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select count(*) from 怎么使用
![select count(*) from 怎么使用](/uploads/image/z/6794523-27-3.jpg?t=select+count%28%2A%29+from+%E6%80%8E%E4%B9%88%E4%BD%BF%E7%94%A8)
是指从from后的表中查询相对应的记录条数
select count(*) from table
当然table后也可以加条件
select count(*) from table where 条件
select count(*) from table
当然table后也可以加条件
select count(*) from table where 条件
select count(*) from 怎么使用
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