select count(*) as total from ddcm_news where key=a

select count(*) as total from ddcm_news where key=a SQL语句理解 select * from B where (select count(1) as num from A select count(*) as total from 'test' order by id desc select A,B,C,D=(select count(*) from 表 where c=a.a and b=a.b select count(*) from v$process a,v$session b where a.addr = SQL >select count(*) from Teacher where teacherCode=? and te $sql="SELECT count(*) as pcount FROM news" 和$sql = "UPDATE a dim cm as New SqlCommand("select count(*) from Users where u sql函数,select count(A.abc) as sum from A left join B on A.id= SELECT COUNT(*) FROM Users WHERE Id={0} AND LoginPwd = '{1}' 这句话我还是看不懂,select count(1) from T_Late where T_Late.Uid = T_W 这个能合并成一句吗?select count(ITEMKIND) from ITEM where ITEMKIND='1