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sql语句的一些参考

發(fā)布時(shí)間：2025/1/21 40 豆豆

生活随笔收集整理的這篇文章主要介紹了 sql语句的一些参考小編覺(jué)得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.

1.如何刪除表中的重復(fù)記錄？(這里指記錄的每個(gè)字段都要相同)
select ?distinct ?* ?into ?#temp ?from ?tab ?
delete ?tab ?
insert ?tab ?select ?* ?from ?#temp ?
drop ?table ?#temp

1.DISTINCT 是 SUM、AVG 和 COUNT 的可選關(guān)鍵字。如果使用 DISTINCT，那么在計(jì)算總和、平均值或計(jì)數(shù)之前，先消除重復(fù)的值。

如果使用 DISTINCT 關(guān)鍵字，表達(dá)式必須只包含列名。而不能包含算術(shù)表達(dá)式。

以下查詢返回商務(wù)書(shū)籍的平均價(jià)格（不包括重復(fù)的值）：

USE pubs
SELECT AVG(DISTINCT price)
FROM titles
WHERE type = 'business'

2.DISTINCT 關(guān)鍵字可從 SELECT 語(yǔ)句的結(jié)果中除去重復(fù)的行,distinct 后面的字段可以是多個(gè)或*,是一個(gè)那就各軍兵種那個(gè)字段來(lái)取不重復(fù)的,
如果是多個(gè),那就是篩選所選的字短都相同的記錄.
USE pubs
SELECT DISTINCT au_id--按照一個(gè)字段篩選
FROM titleauthor

USE pubs
SELECT DISTINCT au_id,au_name --按照兩個(gè)字段篩選
FROM titleauthor

2.怎樣返回?cái)?shù)據(jù)庫(kù)中用戶表的表單名
select ?name ?from ?sysobjects ?where ?xtype='U'??
select ?name ?from ?sysobjects ?where ?xtype ?= ?'u' ?and ?status ?>=0

3.
http://community.csdn.net/Expert/topic/4191/4191899.xml?temp=.5814325
各位大大請(qǐng)幫個(gè)忙,
一個(gè)表中A字段是int型的自動(dòng)編號(hào),B字段是首先要獲取A字段已有的自動(dòng)編號(hào)數(shù)據(jù)再經(jīng)過(guò)加入時(shí)間等后生成的數(shù)據(jù),表如下
C,D(日期),E為其他數(shù)據(jù)
列名 A(自動(dòng)遞加)??? B(A字段數(shù)據(jù)+日期等)?? C?? D?? E
---------------------------------------------------
???????? 1???????????????? A+D??????????? .?? .?? .
???????? 2???????????????? A+D??????????? .?? .?? .

---- 建立測(cè)試環(huán)境：
create table table1(a int identity,b varchar(20),c datetime,d datetime,e int)

create proc proc1
@c datetime,
@d datetime,
@e int
as
declare @f int
insert table1 (c,d,e) values(@c,@d,@e)
select @f=@@identity
if @@error=0
begin
update table1 set b=convert(varchar,a)+convert(varchar(12),d,120) where a=@f
end

---執(zhí)行存儲(chǔ)過(guò)程
exec proc1 '2001-10-01','2001-10-20',45

select * from table1

4.事務(wù)問(wèn)題
http://community.csdn.net/Expert/topic/4245/4245634.xml?temp=.663891

(1)try：
-------------------------------------------------------------------------
CREATE PROCEDURE sp_Order_UpdateOrderFormHeadByAffirm
@OrderFormHeadID int,
@AffirmPerson nvarchar(50)
AS
BEGIN TRANSACTION
??? DECLARE @OrderFormNo nvarchar(50), @FranchiserNo nvarchar(10), @TotalSum decimal(18,4)

??? --更新?tīng)顟B(tài)為確認(rèn)
??? UPDATE
??????? AD_U_HEAD_A_SSGL
??? SET
??????? Tag = 1
??? WHERE
??????? OrderFormHeadID = @OrderFormHeadID
???
??? IF (@@error <> 0)
??? BEGIN
??????? ROLLBACK TRANSACTION
??????? RETURN
??? END

------------------------------------------------------------------------------------------

??? --返回訂單管理（HEAD）的一些信息
??? SELECT
??????? @OrderFormNo = OrderFormNo,
??????? @FranchiserNo = FranchiserNo,
??????? @TotalSum = TotalSum
??? FROM
??????? AD_U_HEAD_A_SSGL
??? WHERE
??????? OrderFormHeadID = @OrderFormHeadID
???
??? IF (@@error <> 0)
??? BEGIN
??????? ROLLBACK TRANSACTION
??????? RETURN
??? END
------------------------------------------------------------------------------------------

??? --更新訂單管理（DATA）
??? UPDATE
??????? AD_U_DATA_A_SSGL
??? SET
??????? Tag = 1,
??????? AffirmPerson = @AffirmPerson,
??????? AffirmDate = GETDATE()
??? WHERE
??????? OrderFormNo = @OrderFormNo
???????
??? IF (@@error <> 0)
??? BEGIN
??????? ROLLBACK TRANSACTION
??????? RETURN
??? END
------------------------------------------------------------------------------------------

??? --經(jīng)銷代理資信余額（MAIN）
??? EXEC sp_Order_UpdateCreditBalance @FranchiserNo, 0, 0, 0, @TotalSum, 0
???
??? IF (@@error <> 0)
??? BEGIN
??????? ROLLBACK TRANSACTION
??????? RETURN
??? END
------------------------------------------------------------------------------------------
??? --新增訂單確認(rèn)日志（SLOG）
??? INSERT INTO
??????? AD_U_SLOG_A_DDQR(OrderFormNo, GoodsNo, Quantity,
??????? UnitPrice, ProductPackingNo,TotalQuantity, TotalSum, Rebate, FactSum)
??? SELECT
??????? OrderFormNo, GoodsNo, Quantity, UnitPrice, ProductPackingNo,
??????? TotalQuantity, TotalSum, Rebate, FactSum
??? FROM
??????? AD_U_DATA_A_SSGL
??? WHERE
??????? OrderFormNo = @OrderFormNo
???
??? IF (@@error <> 0)
??? BEGIN
??????? ROLLBACK TRANSACTION
??????? RETURN
??? END

??? COMMIT TRANSACTION
GO
(2)----------------------------------
CREATE PROCEDURE sp_Order_UpdateOrderFormHeadByAffirm
@OrderFormHeadID int,
@AffirmPerson nvarchar(50)
AS
SET XACT_ABORT ON
BEGIN TRANSACTION
......

(3)你說(shuō)得沒(méi)錯(cuò) 其實(shí)你那樣用事務(wù)的畫(huà)沒(méi)什么作用，每個(gè)存儲(chǔ)過(guò)程都是一個(gè)事務(wù)。如果用事務(wù)最好有出錯(cuò)的處理是否回滾之類的東西。但是要考慮好表之間的關(guān)聯(lián)性，如果都是一些單獨(dú)的表，可以分幾個(gè)事務(wù)處理，如果是父子表還是要放在一個(gè)事務(wù)里面。保證其數(shù)據(jù)的準(zhǔn)確
性。
4請(qǐng)給條如何找出重復(fù)記錄的SQL語(yǔ)句

select id,name,parentDeptid,status as state,type,showindex,url,corpid = 1001
from zfj_dept

日期:
select convert(varchar(16),getDate(),120)?? 2005-11-18 10:20
select convert(varchar,datepart(minute,getdate()))? 獲得分鐘且轉(zhuǎn)換為字符型

內(nèi)聯(lián)結(jié)/外聯(lián)結(jié)
--返回兩個(gè)表中共有的所有記錄
select *
from testTable as a
inner join TestTableChild as b on a.id = b.parentid

--返回(左表)TestTable所有記錄
select *
from testTable as a
left outer join TestTableChild as b on a.id = b.parentid

--返回(右表)TestTableChild的所有記錄
select *
from testTable as a
right outer join TestTableChild as b on a.id = b.parentid

--- 返回兩個(gè)表里共有的記錄,且不重復(fù)
select a.id,a.name,b.name
from testTable as a
inner join TestTableChild as b on a.id = b.parentid
group by a.id,a.name,b.name

--返回(左表)TestTable所有記錄
select a.id,a.name,b.name
from testTable as a
left outer join TestTableChild as b on a.id = b.parentid
group by a.id,a.name,b.name

--------
select a.id,a.subject,b.contentType,c.AuguryUp,c.AuguryDown,
case c.type when '1' then '愛(ài)情' when '2' then '財(cái)運(yùn)' when '3' then '事業(yè)' end as type

from MMS_Content as a
left outer Join MMS_ContentChild as b on a.id = b.parentid
left outer join AuguryList as c on a.id = c.parentid

where a.dept = 6
group by a.id,a.subject,b.contentType,c.AuguryUp,c.augurydown,c.type
?
向一個(gè)表A中插入記錄,并且插入的記錄在A中不存在(通過(guò)一個(gè)字段來(lái)判斷)
insert into trace_users (tracekey,muteSMS,CreateTime,traceuser,tracetime,traceSlot,traceduration)

?select 'TRACE_TIMER',0,getdate(),mobileid,getdate(),'30','0'
???? ?from Epm_EmployeeList where corpid = 10001
????????????? ?and mobileid not in (select traceuser from trace_users )
????????????? ?and mobileid like '13%' and len(mobileid) = 11

下面的要好些(not exists)

insert?into?trace_users?(tracekey,muteSMS,CreateTime,traceuser,tracetime,traceSlot,traceduration)

?select?'TRACE_TIMER',0,getdate(),mobileid,getdate(),'30','0'
??????from?Epm_EmployeeList?where?corpid?=?10001
???????????????and?not?exists?(select?traceuser?from?trace_users?)
???????????????and?mobileid?like?'13%'?and?len(mobileid)?=?11

cast 和convert DateAdd和DateDiff

--導(dǎo)出企業(yè)根據(jù)大類別。四個(gè)表就暈了。。。。。。。

--插入到臨時(shí)表里
select distinct (a.id),a.corpname,a.corplinkman,a.phonenumber,a.createtime,a.address
,(select distinct d.name
from
dz_subinfoDefine as c,
dz_mainInfoDefine as d
where? c.maintype = d.maintype
and c.subtype? = b.infotype) as type

into #table2

from dz_corporation as a
left join dz_information as b on a.id = b.corpid

--插入到表里.需要兩次是因?yàn)闊o(wú)法對(duì)類別(大類)進(jìn)行排序
select case? when type? IS NULL then '未知類別'? else type end as 大類別,corpname as 名稱 ,corplinkman as 聯(lián)系人,phonenumber as 聯(lián)系電話,address as 地址 ,createTime as 創(chuàng)建時(shí)間? into Table1 from #table2
order by type?
----刪除臨時(shí)表
?drop table ?#table2

好的方法????找不到........可能是數(shù)據(jù)庫(kù)設(shè)計(jì)的不好.

通過(guò)另一個(gè)表來(lái)更新本表的記錄.
begin transaction
update EPM_Employeelist? set loginname =b.loginname,password= b.password
?from zfj_users as b
?where
?EPM_Employeelist.userid? = b.userid
??and corpid = 10001
rollback transaction

在in子句中如何寫(xiě)變量的表達(dá)式問(wèn)題

declare?@ids?varchar(8000)
set?@ids?=?'14501,14502,14503'
select?*?from?table1?where??charindex(','+cast(id?as?varchar(20))+',',','+@ids+',')>0

一個(gè)存儲(chǔ)過(guò)程
-獲得系統(tǒng)對(duì)象:
sysobjects
在數(shù)據(jù)庫(kù)內(nèi)創(chuàng)建的每個(gè)對(duì)象（約束、默認(rèn)值、日志、規(guī)則、存儲(chǔ)過(guò)程等）在表中占一行。只有在 tempdb 內(nèi)，每個(gè)臨時(shí)對(duì)象才在該表中占一行。
--所有procedure && 名稱='up_DeleteEnterprise'
select * from sysobjects where xtype = 'P'? and name = 'up_DeleteEnterprise'
?--所有Triger
select * from Sysobjects where xtype = 'TR'
--所有用戶Table
select * from Sysobjects where xtype = 'u'
xtype的值:

--?調(diào)度設(shè)置的時(shí)候更新人員狀態(tài)
--EPM_EmployeeList?里的active?=?1
--trace_Timer?里的active?=?1
--trace_users?里的traceduration?清0
--執(zhí)行例子:exec?up_SetSchedule?1001,'1009,1019'
alter??proc?up_SetSchedule
--create?proc?up_SetSchedule
?@nCorpId?int,
?@vchEmployeeIds?varchar(8000),
?@TimeStart?DateTime,
?@TimeEnd?DateTime

as?
?declare?@sql?varchar(8000),@TraceSolt?int?
?SET?XACT_ABORT?ON?--任何一部有問(wèn)題是都會(huì)回滾事務(wù)
?BEGIN?TRANSACTION?--開(kāi)始事務(wù)
?--更新企業(yè)表中的起始時(shí)間
?update?EPM_EnterpriseList?set?ScheduleStart?=?@TimeStart,ScheduleEnd?=?@TimeEnd
?--更新員工調(diào)度狀態(tài)(清0)
?update?EPM_EmployeeList?set?activeStatus?=?0?where?corpid?=?@nCorpId?and?activeStatus?!=?0?or?activeStatus?is?null
?--Trace_Timer里員工狀態(tài)清0
?update?Trace_Timer?set?activeStatus?=?0?where?corpid?=?@nCorpId?and?activeStatus?!=?0?or?activeStatus?is?null
?--Trace_Users里員工狀態(tài)清0
?update?Trace_Users?set?traceDuration?=?0?where?traceUser?in?(select?mobileid?from?EPM_EmployeeList?where?corpid?=?@nCorpId)

?if?(@vchEmployeeIds?!='')
??begin
??set?@sql?='update?EPM_EmployeeList?set?activeStatus?=?1?where?corpid=?'+convert(varchar(10),@nCorpId)+?'?and?id?in?('+@vchEmployeeIds+')'
??exec?(@sql)
??--更新Trace_timer?執(zhí)法局不需要對(duì)次表操作.
??--set?@sql?='update?trace_Timer?set?activeStatus?=?1?where?corpid=?'+convert(varchar(10),@nCorpId)+?'?and?mobileid??in?('
??--set?@sql=?@sql+'select?mobileid?from?EPM_EmployeeList?where?id?in?('+@vchEmployeeIds+'))'
??--exec?(@sql)
??select?@TraceSolt?=?(select?tracesolt?from?EPM_EnterpriseList?where?id?=?@nCorpId)
??--更新Trace_users?有與沒(méi)有corpid所以只能根據(jù)手機(jī)號(hào)了.
??--set?@sql?='update?trace_users?set?traceDuration?=0??where?traceuser?in?('
??--set?@sql=?@sql+'select?mobileid?from?EPM_EmployeeList?where?id?in?('+@vchEmployeeIds+'))'
??--先判斷用戶是否在Trace_Users里存在,如果存在則修改它,如果不存在需要添加一條記錄.
??--可以先增減沒(méi)有的記錄,然后統(tǒng)一更新這些記錄.
??--增加
??exec?up_SetSchedule_AddUsers?@vchEmployeeIds???--存儲(chǔ)過(guò)程里執(zhí)行存儲(chǔ)過(guò)程.
??--更新
??set?@sql?='update?trace_users?set?createTime?='''+cast(@timeStart?as?varchar)+''''
??set?@sql=?@sql+',traceTime='''+cast(DateAdd(minute,-@TraceSolt,@timeStart)?as?varchar?)
??set?@sql=?@sql+''',traceDuration?='''+convert(varchar,datediff(minute,@timeStart,@timeEnd))+'''?where?traceuser?in?('
??set?@sql=?@sql+'select?mobileid?from?EPM_EmployeeList?where?id?in?('+@vchEmployeeIds+'))'
??exec?(@sql)
??end
?COMMIT?TRANSACTION?--提交事務(wù)
GO

?

--增加表里不存在的記錄.傳遞的參數(shù)為員工ID的集合(號(hào)碼間用逗號(hào)分開(kāi)),判斷是否存在的方法,與上個(gè)相比效率高
create?procedure?up_SetSchedule_AddUsers
?@vchEmployees?varchar(8000)?=?''
as
?--Declare?@vchEmployees?varchar(8000)
?--set?@vchEmployees?=?'1172,1229,1271'
?--Set?@vchEmployees?=?''''+replace(@vchEmployees,',',''',''')+''''
?--select?@vchEmployees
?declare?@vchMobiles?varchar(8000)?--手機(jī)號(hào)碼集合
?--set?@vchEmployees?=?'1172,1229,1271'
?SET?XACT_ABORT?ON?--一步出現(xiàn)問(wèn)題則全部回滾
?Begin?Transaction
?--獲得手機(jī)號(hào)碼集合
?set?@vchMobiles?=?''
?select?@vchMobiles?=?@vchMobiles+','+cast(mobileid?as?varchar(20))?from?EPM_EmployeeList?where?charindex(','+cast(id?as?varchar(20))+',',','+@vchEmployees+',')>0
?set?@vchMobiles=stuff(@vchMobiles,1,1,'')
?--select?@vchMobiles

?while?charindex(',',@vchMobiles)>0
?begin
?????insert?into?Trace_Users(TraceKey,MuteSMS,CreateTime,TraceUser,TraceTime,TraceSlot,TraceDuration)
????select?'TRACE_TIMER',0,getdate(),left(@vchMobiles,charindex(',',@vchMobiles)-1),getDate(),30,0
????where?not?exists(select?traceUser?from?Trace_Users?where?traceUser=left(@vchMobiles,charindex(',',@vchMobiles)-1))
?????set?@vchMobiles?=?stuff(@vchMobiles,1,charindex(',',@vchMobiles),'')
?end
?insert?into?Trace_Users(TraceKey,MuteSMS,CreateTime,TraceUser,TraceTime,TraceSlot,TraceDuration)
????select?'TRACE_TIMER',0,getdate(),@vchMobiles,getDate(),30,0
????where?not?exists(select?1?from?Trace_Users?where?TraceUser=@vchMobiles)
???---判斷是否已經(jīng)有此記錄.
?--rollback?Transaction
?Commit?Transaction
go

up_SetSchedule_AddUsers??'1172,1229,1271'

exec?up_SetSchedule?@nCorpId?=?N'10001',?@vchEmployeeIds?=?N'1271,1484',?@TimeStart?=?N'2005-11-25?8:30:00',?@TimeEnd?=?N'2005-11-25?17:30:00'

---取消一人或多人的調(diào)度,多人之間用逗號(hào)分開(kāi)
create?procedure?up_Schedule_Cancel
?@vchEmployees?varchar(8000)
?
as
?declare?@vchMobiles?varchar(8000)
?--declare?@vchEmployees?varchar(8000)
?--set?@vchEmployees?=?'1484'
?--獲得手機(jī)號(hào)碼集合
?set?@vchMobiles?=?''
?select?@vchMobiles?=?@vchMobiles+','+cast(mobileid?as?varchar(20))?from?EPM_EmployeeList?where?charindex(','+cast(id?as?varchar(20))+',',','+@vchEmployees+',')>0
?set?@vchMobiles=stuff(@vchMobiles,1,1,'')

?set?xact_abort?on
?begin?transaction
?update??EPM_EmployeeList?set?activestatus?=?0?
??where?charindex(','+cast(mobileid?as?varchar(20))+',',','+@vchMobiles+',')>0
?update?Trace_Users?set?traceduration?=?0?
??where?charindex(','+cast(traceUser?as?varchar(20))+',',','+@vchMobiles+',')>0
?commit?transaction
?
go

C = CHECK 約束
D = 默認(rèn)值或 DEFAULT 約束
F = FOREIGN KEY 約束
L = 日志
FN = 標(biāo)量函數(shù)
IF = 內(nèi)嵌表函數(shù)
P = 存儲(chǔ)過(guò)程
PK = PRIMARY KEY 約束（類型是 K）
RF = 復(fù)制篩選存儲(chǔ)過(guò)程
S = 系統(tǒng)表
TF = 表函數(shù)
TR = 觸發(fā)器
U = 用戶表
UQ = UNIQUE 約束（類型是 K）
V = 視圖
X = 擴(kuò)展存儲(chǔ)過(guò)程

---判斷臨時(shí)表是否存在
if exists(select 1 from tempdb..sysobjects where id=object_id('tempdb..#表名') and xtype='U')
drop table #表名

--字段值為NULL轉(zhuǎn)化為0,多看系統(tǒng)方法
isnull(字段,0)

--table1和talbe2交叉聯(lián)接的結(jié)果集再和table3左聯(lián)接
select a.*,c.others from
(select a.id,a.name,b.remark
??? from table1 a,table2 b) a
??? left join table3 c on a.id = c.parentid
自定義方法的使用.
--根據(jù)手機(jī)型號(hào)獲得其所屬模式.若模式為空或NULL則返回2(中模式)
--例子:select mms.dbo.uf_GetMobileModel(205) as aaa
alter FUNCTION uf_GetMobileModel
??? (@nModelId int)
RETURNS int

AS?

BEGIN
??? --declare @nModelId int
??? --set @nModelId = 205
??? declare @Mode int
??? select? @Mode= model from MMS_MobileChild? where id = @nModelId
??? if @Mode = '' or @Mode is null
??????? set @Mode = 2
??? --select @Mode
??? return (@Mode)
END
隨機(jī)數(shù)自定義方法
--通過(guò)View來(lái)獲得隨即數(shù)字.在方法里直接使用rand()不可以的.
create view uv_GetRandom
as
??? select rand() as RandomValue
go
--生成n位隨機(jī)數(shù)的方法
--select locationServiceNew.dbo.getRandom(10)
--比較郁悶..好麻煩
alter function GetRandom(@nLength int=4)
??? returns? int
as
begin?
??? declare @nStart? int,@vchLength varchar(50)
??? set @nstart = 1
??? set @vchLength = '1'
??? if @nLength >9 set @nLength = 9 --如果隨機(jī)數(shù)位數(shù)大于9那么將其修改為9
??? if @nLength <1 set @nLength = 1 --如果隨機(jī)數(shù)位數(shù)小于1那么將其修改為1
??? while @nStart <= @nLength
??? begin
??????? set @vchLength = @vchLength+'0'
??????? set @nStart = @nStart+1
??? end

??? declare @floatNum float,@intNum int
??????? --set @num=cast(left(rand(),8) as float)*1000000
??????? select @floatNum = RandomValue from uv_GetRandom
??????? set @intNum = cast(@floatNum*cast(@vchLength as int) as int)
??????? return (@intNum)
end
go

--測(cè)試
select locationServiceNew.dbo.getRandom(7)

用戶定義函數(shù)中不允許使用會(huì)對(duì)每個(gè)調(diào)用返回不同數(shù)據(jù)的內(nèi)置函數(shù)
其中就有g(shù)etdate哦
用戶定義函數(shù)中不允許使用以下內(nèi)置函數(shù)：

@@CONNECTIONS
@@PACK_SENT
GETDATE
@@CPU_BUSY
@@PACKET_ERRORS
GetUTCDate
@@IDLE
@@TIMETICKS
NEWID
@@IO_BUSY
@@TOTAL_ERRORS
RAND
@@MAX_CONNECTIONS
@@TOTAL_READ
TEXTPTR
@@PACK_RECEIVED
@@TOTAL_WRITE

--創(chuàng)建指定位的隨即數(shù)
create? proc up_GetRandom
??? @nLength int = 4, --隨即數(shù)的位數(shù).
??? @vchValue int output
as
??? declare @nStart? int,@vchLength varchar(50)
??? set @nstart = 1
??? set @vchLength = '1'
??? if @nLength >9 set @nLength = 9 --如果隨機(jī)數(shù)位數(shù)大于9那么將其修改為9
??? if @nLength <1 set @nLength = 1 --如果隨機(jī)數(shù)位數(shù)小于1那么將其修改為1
??? while @nStart <= @nLength
??? begin
??????? set @vchLength = @vchLength+'0'
??????? set @nStart = @nStart+1
??? end

??? set @vchValue= cast(rand()*cast(@vchLength as int) as int)
???
go
--測(cè)試
declare @randomValue int
Exec up_getRandom 8,@randomValue output
select @randomValue
按照月統(tǒng)計(jì)

select datepart(month,createtime) as '月分',count(mobileid) as '數(shù)量'
from User_answer
where createtime >= '2005-4-29' and accessnumber = 1111111
group by datepart(month,createtime)
--按照月分統(tǒng)計(jì),考慮多年
select * from
?(
?select convert(char(7),createtime,120) as 年月,count(*) as 數(shù)量 from users group by convert(char(7),createtime,120)
?) as a
?order by left(年月,4),right(年月,2)
-------------------------------------------------------------

/*
表TABLE1 ID（INT），CORPID（INT），CREATETIME（DATETIME）

? CORPID 有重復(fù)的記錄。

現(xiàn)在想按照CREATETIME倒序取出CORPID不重復(fù)的前10條記錄（重復(fù)的只取1條）。

create table TABLE1 (ID int identity(1,1),CORPID int,CREATETIME datetime)
insert table1(corpid,createtime)
select 11,'2006-02-09 14:21:48.357' union all
select 1 ,'2006-02-09 14:02:46.357' union all
select 1 ,'2006-02-09 14:03:46.357' union all
select 1 ,'2006-02-09 14:03:46.357' union all
select 10,'2006-02-09 14:04:46.357' union all
select 3 ,'2006-02-09 14:05:46.357' union all
select 5 ,'2006-02-09 14:05:46.357' union all
select 6 ,'2006-02-09 14:06:46.357' union all
select 7 ,'2006-02-09 14:07:46.357' union all
select 8 ,'2006-02-09 14:08:46.357' union all
select 9 ,'2006-02-09 14:09:46.357' union all
select 9 ,'2006-02-09 14:10:46.357' union all
select 10,'2006-02-09 14:11:46.357' union all
select 10,'2006-02-09 14:12:46.357' union all
select 10,'2006-02-09 14:13:46.357' union all
select 11,'2006-02-09 14:14:46.357' union all
select 11,'2006-02-09 14:15:46.357'

--方法一可以獲得table中的所有字段/也可以只獲得一個(gè).
select
??? TOP 10 a.*
from
??? TABLE1 a
where
??? not exists(select
?????????????????? 1
?????????????? from
?????????????????? TABLE1
?????????????? where
?????????????????? CORPID=a.CORPID and (CREATETIME>a.CREATETIME or (CREATETIME=a.CREATETIME and ID>a.ID)))
order by
??? a.CREATETIME DESC

其它
select a.fee_user as '號(hào)碼',b.message as '內(nèi)容',a.sendTime as '時(shí)間'
?
?into test
???? from his_smdr a
???? left join his_deliver b on? a.fee_User = b.src_userid?
???? where?
???? a.src_addr = '05555001' and a.sendtime >='2005-4-29'
???? and a.src_addr=b.dst_userid --需要
???? and datediff(ss,b.createtime,a.sendtime)<=10 and datediff(ss,b.createtime,a.sendtime)>='0'
?
???? order by sendTime desc

表 A ，有2個(gè)字段 Id--Int，Name--Varchar(20)

假設(shè) 表 A 里存儲(chǔ)了30萬(wàn)記錄，其中有1條記錄的 ID 是重復(fù)的，現(xiàn)在我想找出該條記錄ID，SQL語(yǔ)句？

select ID from A group by ID having count(1)>1
?
有一個(gè)觸發(fā)器,觸發(fā)該觸發(fā)器的方法有insert,update,delete ?
但是,我如何可以判斷我到底是用哪種方法觸發(fā)該觸發(fā)器??
http://community.csdn.net/Expert/topic/4234/4234894.xml?temp=.3572657
create ?trigger ?觸發(fā)名 ?on ?表名 ?
instead ?of ?insert,update,delete ?
as ?
? ? ?--insert插入 ?
? ? ?if ?not ?exists(select ?1 ?from ?deleted) ?
? ? ?begin ?
? ? ? ? ? ? ? ? ? ?打印插入 ?
? ? ?end ?
?
? ? ?--update更新 ?
? ? ?if ?exists(select ?1 ?from ?inserted) ?and ?exists(select ?1 ?from ?deleted) ?
? ? ?begin ? ?
? ? ? ? ? ? ? ? ?打印修改 ?
? ? ?end ?
?
? ? ?--delete刪除 ?
? ? ?if ?not ?exists(select ?1 ?from ?inserted) ? ? ? ?
? ? ?begin ?
? ? ? ? ? ? ? ? ? ? ?打印刪除 ?
? ? ?end ?
go??

有兩個(gè)表 table1 和talbe2，字段和內(nèi)容如下

字段 id? name???????? id so
???
???? 00? n1?????????? 00 s1
???? 01? n2?????????? 03 s3
???? 03? n3

怎樣寫(xiě)一個(gè)sql語(yǔ)句，得到記錄集
?字段 id? name?? so
???
????? 00? n1???? s1
????? 01? n2??????????
????? 03? n3???? s3

select A.*
?????? ,isnull(B.so,'') as 'so'
from table1 A
left join table2 B on A.id=B.id

獲得所有觸發(fā)器及其表名
select object_name(id) as 觸發(fā)器名稱, object_name(parent_obj) as 表名稱 from sysobjects
where xtype=N'TR'

-- 由一個(gè)表向另一表插入數(shù)據(jù).
insert into? EPM_DepartmentList(id,name,parentdeptid,state,type,showindex,url,corpid)

與50位技術(shù)專家面對(duì)面20年技術(shù)見(jiàn)證，附贈(zèng)技術(shù)全景圖

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sql语句的一些参考

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