1.复制表结构及数据到新表
CREATE TABLE 新表 SELECT * FROM 旧表
2.只复制表结构到新表
CREATE TABLE 新表 SELECT * FROM 旧表 WHERE 1=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)
INSERT INTO 新表 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)
INSERT INTO 新表(字段1,字段2,…….) SELECT 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：
在表上面右击——编写表脚本为:——Create到——新查询编辑器窗口，你也可以保存为sql文件，
新查询编辑器窗口的话在最上面一条把use databasename改成你要复制过去的数据库名称
如果遇到：
IDENTITY_INSERT 设置为 OFF 时,不能向表 ‘id’ 中的标识列插入显式值。
插入数据的时候不要为id列指定值，也就是 insert into table ( ...)语句中,括号中的字段中不要包含id列。
SQL SERVER 2008
insert into b(a, b, c) select d,e,f from b;
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_DATE FROM TABLE1, (SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND FROM TABLE2 WHERE TO_CHAR(UPD_DATE, 'YYYY/MM' ) = TO_CHAR(SYSDATE, 'YYYY/MM' )) X, (SELECT NUM, UPD_DATE, STOCK_ONHAND FROM TABLE2 WHERE TO_CHAR(UPD_DATE, 'YYYY/MM' ) = TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, 'YYYY/MM' ) || '/01' , 'YYYY/MM/DD' ) - 1, 'YYYY/MM' ) ) Y, WHERE X.NUM = Y.NUM （+） AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B WHERE 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 专业名称= '"&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 DEC FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration FROM TELFEESTAND a, TELFEE b WHERE a.tel = b.telfax) a GROUP 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) as HandleID FROM Handle WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle |