1.複製表結構及數據到新表 CREATE TABLE 新表 SELECT * FROM 舊表 2.只複製表結構到新表 CREATE TABLE 新表 SELECT * FROM 舊表 WHERE 1=2 即:讓WHERE條件不成立. 方法二:(由tianshibao提供) CREATE TABLE ...
1.複製表結構及數據到新表
CREATE TABLE 新表 SELECT * FROM 舊表2.只複製表結構到新表
CREATE TABLE 新表 SELECT * FROM 舊表 WHERE 1=2即:讓WHERE條件不成立.
方法二:(由tianshibao提供)
CREATE TABLE 新表 LIKE 舊表3.複製舊表的數據到新表(假設兩個表結構一樣)
INSERT INTO 新表 SELECT * FROM 舊表4.複製舊表的數據到新表(假設兩個表結構不一樣)
INSERT INTO 新表(欄位1,欄位2,.......) SELECT 欄位1,欄位2,...... FROM 舊表 如果是 SQL SERVER 2008 複製表結構，使用如下方法：在表上面右擊——編寫表腳本為:——Create到——新查詢編輯器視窗，你也可以保存為sql文件，
新查詢編輯器視窗的話在最上面一條把use databasename改成你要複製過去的資料庫名稱
如果遇到：
IDENTITY_INSERT 設置為 OFF 時,不能向表 'id' 中的標識列插入顯式值。
插入數據的時候不要為id列指定值，也就是 insert into table ( ...)語句中,括弧中的欄位中不要包含id列。
SQL SERVER 2008
insert into b(a, b, c) select d,e,f from b;
說明：複製表(只複製結構,源表名：a 新表名：b)
SQL: select * into b from a where 1<>1
說明：拷貝表(拷貝數據,源表名：a 目標表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;
說明：顯示文章、提交人和最後回覆時間
SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
說明：外連接查詢(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
說明：日程安排提前五分鐘提醒
SQL: select * from 日程安排 where datediff('minute',f開始時間,getdate())>5
說明：兩張關聯表，刪除主表中已經在副表中沒有的信息
SQL:
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
說明：--
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
說明：--
SQL:
select * from studentinfo where not exists(select * from student where studentinfo.id=student.id) and 系名稱='"&strdepartmentname&"' and 專業名稱='"&strprofessionname&"' order by 性別,生源地,高考總成績
說明：
從資料庫中去一年的各單位電話費統計(電話費定額賀電化肥清單兩個表來源）
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')
說明：四表聯查問題：
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 .....
說明：得到表中最小的未使用的ID號
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
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