select a.* from test a where 1 > (select count(*) from test

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 count(*) as total from ddcm_news where key=a select count(1) from emp 关系代数 现有表test内有属性（t1,t2,t3）SQL语句：select *from test as A,test select A,B,C,D=(select count(*) from 表 where c=a.a and b=a.b select * into b from a where 11 select *from A where A.a like '%1%'||'%' select count(*) from v$process a,v$session b where a.addr = select ** from A where A.id in (select id from B where ****) select count(*) from table1 select count(*) from table2 sele select count(*) from 怎么使用