SQL语句:SELECT * from stu where name like "%伟%";的作用是:_________________________.

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(+) oracle sql语句获取前两条数据select id,seq from hzds_admin where seq sql语句中!例如SELECT STUDENT.学号,student.姓名from sdb!student SQL语句:SELECT * from stu where name like %伟%;的作用是:_________________________. select ename from emp where ename like'%A___'; 这条SQL语句中'%A___'是什么意思? 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 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 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 select id from (select * from tree)这个sql语句有什么错吗提示：Every derived table must have its own aliasmysql数据库 sql语句中加中括号和不加有什么区别吗?比如:SELECT title FROM authors和SELECT [title] FROM [authors]这两个有区别吗? 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. sql语句：去掉最大值,去掉最小值,算平均值SELECT AVG(Scores.Score)FROM ScoresWHERE ( ( (Scores.[ID]) = @id)AND (Score < (SELECT MAX(Score) From Scores WHERE Scores.[ID] = @id) )AND (Score > (SELECT MIN(Score) From Scores WHERE Scores.[I select count(*) from table1 select count(*) from table2 select count(*) from table3我从table1 table2 table3 中 找数据的条数怎样一下子用一条sql语句 算出TABLE1 TABLE2 TABLE3 记录的总和? sql如何取交集有这样两条sql语句select distinct id from a where id='123'select distinct id from a where id='456'我希望能把他们取得他们记录的交集,sql语句该如何写?错了 应该是这样的select distinct temid from a whe 大侠这个查询语句的意思?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