1.复制表结构及数据到新表
CREATE TABLE 新表 SELECT * FROM 旧表
如我使用的：CREATE TABLE DM_ZRR_QX_GNS AS SELECT * FROM DM_QX_GNS
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
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;
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
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
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
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 )
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,
‘YYYY/MM’
) = TO_CHAR(SYSDATE,
‘YYYY/MM’
)) X,
(SELECT NUM, UPD_DATE, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,
‘YYYY/MM’
) =
‘YYYY/MM’
) =
TO_CHAR(TO_DATE(TO_CHAR(SYSDATE,
‘YYYY/MM’
) ||
‘/01’
,
‘YYYY/MM/DD’
) – 1,
‘YYYY/MM’
) ) Y,
‘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
*
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,
‘yyyy’
) AS telyear,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’01’
, a.factration)) AS JAN,
‘mm’
),
’01’
, a.factration)) AS JAN,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’02’
, a.factration)) AS FRI,
‘mm’
),
’02’
, a.factration)) AS FRI,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’03’
, a.factration)) AS MAR,
‘mm’
),
’03’
, a.factration)) AS MAR,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’04’
, a.factration)) AS APR,
‘mm’
),
’04’
, a.factration)) AS APR,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’05’
, a.factration)) AS MAY,
‘mm’
),
’05’
, a.factration)) AS MAY,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’06’
, a.factration)) AS JUE,
‘mm’
),
’06’
, a.factration)) AS JUE,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’07’
, a.factration)) AS JUL,
‘mm’
),
’07’
, a.factration)) AS JUL,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’08’
, a.factration)) AS AGU,
‘mm’
),
’08’
, a.factration)) AS AGU,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’09’
, a.factration)) AS SEP,
‘mm’
),
’09’
, a.factration)) AS SEP,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’10’
, a.factration)) AS OCT,
‘mm’
),
’10’
, a.factration)) AS OCT,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’11’
, a.factration)) AS NOV,
‘mm’
),
’11’
, a.factration)) AS NOV,
SUM(decode(TO_CHAR(a.telfeedate,
‘mm’
),
’12’
, a.factration)) AS DEC
‘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’
)
‘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
…..
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
as
HandleID
FROM Handle
WHERE NOT HandleID IN (SELECT a.HandleID – 1 FROM Handle
原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/4337.html