1.復制表結構及數據到新表
CREATE TABLE 新表 SELECT * FROM 舊表
如我使用的：CREATE TABLE DM_ZRR_QX_GNS AS SELECT * FROM DM_QX_GNS
2.只復制表結構到新表
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.復制舊表的數據到新表(假設兩個表結構一樣)
INSERT INTO 新表 SELECT * FROM 舊表
4.復制舊表的數據到新表(假設兩個表結構不一樣)
INSERT INTO 新表(字段1,字段2,.......) SELECT 字段1,字段2,...... FROM 舊表
如果是 SQL SERVER 2008 復制表結構，使用如下方法：
IDENTITY_INSERT 設置為 OFF 時,不能向表 'id' 中的標識列插入顯式值。
說明：復制表(只復制結構,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、提交人和最后回復時間
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：日程安排提前五分鍾提醒
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：
從數據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