如果新表不存在
select * into newtable from oldtable
如果存在
insert into newtable select * from oldtable ---表结构一致
insert into newtable(列名1,列名2,.....) select 列名1,列名2....from oldtable --表结构不一致
1.复制表结构及数据到新表
CREATE TABLE 新表SELECT *
FROM 旧表
FROM 旧表
2.只复制表结构到新表
CREATE TABLE 新表SELECT *
FROM 旧表
WHERE1=2
FROM 旧表
WHERE1=2
即:让WHERE条件不成立.
方法二:(由tianshibao提供)
CREATE TABLE 新表 LIKE 旧表
3.复制旧表的数据到新表(假设两个表结构一样)
INSERTINTO 新表
SELECT *
FROM 旧表
SELECT *
FROM 旧表
4.复制旧表的数据到新表(假设两个表结构不一样)
INSERTINTO 新表(字段1,字段2,.......)SELECT
字段1,字段2,......FROM 旧表
字段1,字段2,......FROM 旧表
如果是 SQL SERVER 2008 复制表结构，使用如下方法：
IDENTITY_INSERT 设置为 OFF 时,不能向表 'id' 中的标识列插入显式值。
说明：复制表(只复制结构,源表名：a 新表名：b)SQL: select * into b from a where 1<>1说明：拷贝表(拷贝数据,源表名：a 目标表名：b)SQL: insert into b(a, b, c) select d,e,f from b;说明：显示文章、提交人和最后回复时间SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b说明：外连接查询(表名1：a 表名2：b)SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c说明：日程安排提前五分钟提醒SQL: select * from 日程安排 where datediff('minute',f开始时间,getdate())>5说明：两张关联表，删除主表中已经在副表中没有的信息SQL:delete from info where not exists ( select * from infobz where info.infid=infobz.infid )说明：--SQL:SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATEFROM TABLE1,(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATEFROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHANDFROM TABLE2WHERE TO_CHAR(UPD_DATE,'YYYY/MM') = TO_CHAR(SYSDATE,'YYYY/MM'))(SELECT NUM, UPD_DATE, STOCK_ONHANDFROM TABLE2WHERE TO_CHAR(UPD_DATE,'YYYY/MM') =TO_CHAR(TO_DATE(TO_CHAR(SYSDATE,'YYYY/MM') ||'/01','YYYY/MM/DD')'YYYY/MM') ) Y,WHERE X.NUM = Y.NUM （+）AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) BWHERE A.NUM = B.NUM说明：--SQL:select * from studentinfo where not exists(select * from student where studentinfo.id=student.id) and 系名称='"&strdepartmentname&"'and'"&strprofessionname&"'order by 性别,生源地,高考总成绩说明：从数据库中去一年的各单位电话费统计(电话费定额贺电化肥清单两个表来源）SQL:SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate,'yyyy') AS telyear,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'01', a.factration)) AS JAN,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'02', a.factration)) AS FRI,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'03', a.factration)) AS MAR,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'04', a.factration)) AS APR,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'05', a.factration)) AS MAY,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'06', a.factration)) AS JUE,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'07', a.factration)) AS JUL,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'08', a.factration)) AS AGU,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'09', a.factration)) AS SEP,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'10', a.factration)) AS OCT,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'11', a.factration)) AS NOV,SUM(decode(TO_CHAR(a.telfeedate,'mm'),'12', a.factration)) AS DECFROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factrationFROM TELFEESTAND a, TELFEE bWHERE a.tel = b.telfax) aGROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate,'yyyy')说明：四表联查问题：SQL: select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....说明：得到表中最小的未使用的ID号SQL:SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END)asHandleIDFROM HandleWHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle |