这段SQL语句的功能from t_rpContractEntry t1left join t_ICItem t2 on t2.fitemid=t1.fproductid left join t_RPContract t3 on t1.FContractID=t3.FContractIDleft join t_Organization t4 on t3.FCustomer = t4.fitemid数据库降级了下,有几个SQL公

这段SQL语句的功能from t_rpContractEntry t1left join t_ICItem t2 on t2.fitemid=t1.fproductid left join t_RPContract t3 on t1.FContractID=t3.FContractIDleft join t_Organization t4 on t3.FCustomer = t4.fitemid数据库降级了下,有几个SQL公 DROP-SQL语句属于一种什么功能的语句 DROP-SQL语句属于一种什么功能的语句 select id,name from student where id in ( select id from score having count(id)>=2 );以上这段语句有没语法错误.SQL语句 这句SQL语句是什么意思.ql=select distinct(selabel) from.sql=select distinct(selabel) from kcwl_labprosellog where isdel=0 &sqlfile& and selabel not in (select distinct(selabel) from kcwl_labprosell) 这个语句是什么作用的.说具 SQL 语句 SELECT * FROM {{table}} WHERE `fleet_end_time` sql语句 后面的(+) select * from t1,t2 where t1.a=t2.b(+) sql连接查询语句中from子句中表的顺序有什么要求 SQL语句:SELECT * from stu where name like %伟%;的作用是:_________________________. drop table if exists address_book;这句SQL语句是什么意思我备份的SQL语句中有这么一行, select ename from emp where ename like'%A___'; 这条SQL语句中'%A___'是什么意思? 关于SQL语句里面的A.XX,和B.select B.kecheng,B.score,B.xuehaofrom(select kecheng ,max(score) AS score from jiaScore group by kecheng) A,jiaScore Bwhere A.kecheng = B.kechengand A.score = B.score例如我这段数据库语句,A.kecheng和B.keche 求单表查询的hql语句怎么写sqL如下：select * from aaa20 where aaae2001 = '11111111';求hql语句写法 sql 语句中commit的作用 SQL语句SELECT*FORM TABLE-A WHERE name LIKE‘-mation‘ 的功能?还有SELECT*FORM TABLE-A WHERE name LIKE‘%mation‘ 的功能. 大侠这个查询语句的意思是什么?sql=select DISTINCT 日期 from +tablename+ where 日期>=' +df +' and 日期 sql 语句中 select * from table where 2=1 的where2=1有什么意思和作用 select * from customers where CompanyName like '+TextBox1.Text+' ,如上sql语句.请问'+TextBox1.Text+'到底应用的什么语法.