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sql查询总数

select COUNT(a.name) from sys.all_columns a,sys.tables b where a.object_id=b.object_id and b.name='table_name'

‍ select year(时间字段) as '年',month(时间字段) as '月',count(1) as '数据条数' from 表名 group by year(时间字段),month(时间字段)

sql中查询记录数用count函数。 1、创建测试表,插入数据: create table test(id int)insert into test values (1)insert into test values (2)insert into test values (3)insert into test values (null)2、查询记录数为两种,一种是count(*)...

汇总查询,就是group by 字段

如果你的表有主键 那就用select count(主键) from 表名 。这样写对数据的优化有好处。

select b, count(a) as '数量' from msg group by b

很简单啊 等我给你做下

select count(*) from (select * from 表名 where rownum

select 编号,内容,COUNT(*) AS 总数 from question group by 编号,内容

select a.name,count(1) from grouop a,member b where a.id=b.gid group by a.name

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