1. 复制表结构
Sql代码
1. select * into B from A where 1=0;
select * into B from A where 1=0;
2.复制表记录 复制某些字段
Sql代码
1. insert into B(a, b, c) select d, e, f from A;
insert into B(a, b, c) select d, e, f from A;
复制整个表记录
Sql代码
1. insert into B select * from A;
insert into B select * from A;
3.外连接查询
Sql代码
1. select A.a, A.b, A.c, B.c, B.d, B.f from A LEFT OUT JOIN B ON A.a = B.c;
select A.a, A.b, A.c, B.c, B.d, B.f from A LEFT OUT JOIN B ON A.a = B.c;
4.取特定时间内的数据
Sql代码
1. select * from A where datediff("minute", 开始时间字段, getdate())>时间差
select * from A where datediff("minute", 开始时间字段, getdate())>时间差
5.两张关联表，删除主表中已经在副表中没有的信息
Sql代码
1. delete from A where not exists(select ID from B where A.infid=B.infid );
delete from A where not exists(select ID from B where A.infid=B.infid );
6. 复杂的多级条件查询
Sql代码
1. SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE
2. from TABLE1,(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE
3. from (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND
4. from TABLE2
5. WHERE TO_CHAR(UPD_DATE,’’YYYY/MM’’) =
6. &nb
