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精妙Sql語(yǔ)句
1． 判斷a表中有而b表中沒(méi)有的記錄
select a.* from tbl1 a
left join tbl2 b
on a.key = b.key
where b.key is null
雖然使用in也可以實(shí)現(xiàn)，但是這種方法的效率更高一些
2． 新建一個(gè)與某個(gè)表相同結(jié)構(gòu)的表
select * into b
from a where 1<>1
3．between的用法,between限制查詢數(shù)據(jù)范圍時(shí)包括了邊界值,not between不包括
select * from table1 where time between time1 and time2
select a,b,c, from table1 where a not between 數(shù)值1 and 數(shù)值2
4. 說(shuō)明：包括所有在 TableA 中但不在 TableB和TableC 中的行并消除所有重復(fù)行而派生出一個(gè)結(jié)果表
(select a from tableA ) except (select a from tableB) except (select a from tableC)
5. 初始化表，可以將自增長(zhǎng)表的字增長(zhǎng)字段置為1
TRUNCATE TABLE table1
6．多語(yǔ)言設(shè)置數(shù)據(jù)庫(kù)或者表或者order by的排序規(guī)則
--修改用戶數(shù)據(jù)庫(kù)的排序規(guī)則
ater database dbname collate SQL_Latin1_General_CP1_CI_AS
--修改字段的排序規(guī)則
alter table a alter column c2 varchar(50) collate SQL_Latin1_General_CP1_CI_AS
--按姓氏筆畫(huà)排序
select * from 表名 order by 列名 Collate Chinese_PRC_Stroke_ci_as
--按拼音首字母排序
select * from 表名 order by 列名 Collate Chinese_PRC_CS_AS_KS_WS
7．列出所有的用戶數(shù)據(jù)表：
SELECT TOP 100 PERCENT o.name AS 表名
FROM dbo.syscolumns c INNER JOIN
dbo.sysobjects o ON o.id = c.id AND objectproperty(o.id, N'IsUserTable') = 1 AND
o.name <> 'dtproperties' LEFT OUTER JOIN
dbo.sysproperties m ON m.id = o.id AND m.smallid = c.colorder
WHERE (c.colid = 1)
ORDER BY o.name, c.colid
8．列出所有的用戶數(shù)據(jù)表及其字段信息：
SELECT TOP 100 PERCENT c.colid AS 序號(hào), o.name AS 表名, c.name AS 列名,
t.name AS 類型, c.length AS 長(zhǎng)度, c.isnullable AS 允許空,
CAST(m.[value] AS Varchar(100)) AS 說(shuō)明
FROM dbo.syscolumns c INNER JOIN
dbo.sysobjects o ON o.id = c.id AND objectproperty(o.id, N'IsUserTable') = 1 AND
o.name <> 'dtproperties' INNER JOIN
dbo.systypes t ON t.xusertype = c.xusertype LEFT OUTER JOIN
dbo.sysproperties m ON m.id = o.id AND m.smallid = c.colorder
ORDER BY o.name, c.colid
9．Left，right Join的另外一種簡(jiǎn)潔的寫(xiě)法
select * from a,b where a.id *= b.id --（*= 相當(dāng)于 LEFT JOIN）
select * from a,b where a.id =* b.id --（=* 相當(dāng)于 Right JOIN）
10．Update from 和 delete from
11．得到表中最小的未使用的ID號(hào)
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 a)
12．隨機(jī)取得記錄
SELECT TOP 10 * FROM T1 ORDER BY NEWID()
精妙SQL語(yǔ)句介紹
如何從一位菜鳥(niǎo)蛻變成為高手，靈活使用的SQL語(yǔ)句是必不可少的。本文收集了部分比較經(jīng)典，常用的SQL語(yǔ)句供大家參考，希望對(duì)大家有所幫助。
說(shuō)明：復(fù)制表(只復(fù)制結(jié)構(gòu),源表名：a 新表名：b)
SQL: select * into b from a where 1<>1
說(shuō)明：拷貝表(拷貝數(shù)據(jù),源表名：a 目標(biāo)表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;
說(shuō)明：顯示文章、提交人和最后回復(fù)時(shí)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(shuō)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(shuō)明：日程安排提前五分鐘提醒
SQL: select * from 日程安排 where datediff('minute',f開(kāi)始時(shí)間,getdate())>5
說(shuō)明：兩張關(guān)聯(lián)表，刪除主表中已經(jīng)在副表中沒(méi)有的信息
SQL:
delete from info where not exists ( select * from infobz where info.infid=infobz.infid
說(shuō)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(shuō)明：--
SQL:
select * from studentinfo where not exists(select * from student where studentinfo.id=student.id) and 系名稱='"&strdepartmentname&"' and 專業(yè)名稱='"&strprofessionname&"' order by 性別,生源地,高考總成績(jī)
說(shuō)明：
從數(shù)據(jù)庫(kù)中去一年的各單位電話費(fèi)統(tǒng)計(jì)(電話費(fèi)定額賀電化肥清單兩個(gè)表來(lái)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(shuō)明：四表聯(lián)查問(wèn)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(shuō)明：得到表中最小的未使用的ID號(hào)
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 a)
本文導(dǎo)航
- 第1頁(yè): 首頁(yè)
- 第2頁(yè): 幾個(gè)簡(jiǎn)單的基本的sql語(yǔ)句
- 第3頁(yè): 幾個(gè)高級(jí)查詢運(yùn)算詞
- 第4頁(yè): 精妙Sql語(yǔ)句
- 第5頁(yè): 數(shù)據(jù)庫(kù)創(chuàng)建、備份、刪除
- 第6頁(yè): SQL數(shù)據(jù)庫(kù)存儲(chǔ)過(guò)程
- 第7頁(yè): SQL語(yǔ)句大全
- 第8頁(yè): 數(shù)據(jù)庫(kù)中的常用函數(shù)
- 第9頁(yè): sql中的保留字
- 第10頁(yè): 數(shù)據(jù)結(jié)構(gòu)的復(fù)制拷貝
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