如何删除表中的重复记录?等等常用SQL语句的积累

1.如何删除表中的重复记录？(这里指记录的每个字段都要相同)
select distinct * into #temp from tab
delete tab
insert tab select * from #temp
drop table #temp

1.DISTINCT 是 SUM、AVG 和 COUNT 的可选关键字。如果使用 DISTINCT，那么在计算总和、平均值或计数之前，先消除重复的值。

如果使用 DISTINCT 关键字，表达式必须只包含列名。而不能包含算术表达式。

以下查询返回商务书籍的平均价格（不包括重复的值）：

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

2.DISTINCT 关键字可从 SELECT 语句的结果中除去重复的行,distinct 后面的字段可以是多个或*,是一个那就各军兵种那个字段来取不重复的,
如果是多个,那就是筛选所选的字短都相同的记录.
USE pubs
SELECT DISTINCT au_id--按照一个字段筛选
FROM titleauthor

USE pubs
SELECT DISTINCT au_id,au_name --按照两个字段筛选
FROM titleauthor

2.怎样返回数据库中用户表的表单名
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
各位大大请帮个忙,
一个表中A字段是int型的自动编号,B字段是首先要获取A字段已有的自动编号数据再经过加入时间等后生成的数据,表如下
C,D(日期),E为其他数据
列名 A(自动递加)    B(A字段数据+日期等)   C   D   E
---------------------------------------------------
         1                 A+D            .   .   .
         2                 A+D            .   .   .

---- 建立测试环境：
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

---执行存储过程
exec proc1 '2001-10-01','2001-10-20',45

select * from table1

4.事务问题
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)

    --更新状态为确认
    UPDATE
        AD_U_HEAD_A_SSGL
    SET
        Tag = 1
    WHERE
        OrderFormHeadID = @OrderFormHeadID
   
    IF (@@error <> 0)
    BEGIN
        ROLLBACK TRANSACTION
        RETURN
    END

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

    --返回 订单管理（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 订单管理（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
------------------------------------------------------------------------------------------

    --经销代理资信余额（MAIN）
    EXEC sp_Order_UpdateCreditBalance @FranchiserNo, 0, 0, 0, @TotalSum, 0
   
    IF (@@error <> 0)
    BEGIN
        ROLLBACK TRANSACTION
        RETURN
    END
------------------------------------------------------------------------------------------
    --新增 订单确认日志（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)你说得没错 其实你那样用事务的画没什么作用，每个存储过程都是一个事务。如果用事务最好有出错的处理是否回滚之类的东西。但是要考虑好表之间的关联性，如果都是一些单独的表，可以分几个事务处理，如果是父子表还是要放在一个事务里面。保证其数据的准确
性。
4请给条如何找出重复记录的SQL语句

 

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())) 获得分钟且转换为字符型

内联结/外联结
--返回两个表中共有的所有记录
select *
from testTable as a
inner join TestTableChild as b on a.id = b.parentid

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

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

--- 返回 两个表里共有的记录,且不重复
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所有记录
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 '爱情' when '2' then '财运' when '3' then '事业' 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

向一个表A中插入记录,并且插入的记录在A中不存在(通过一个字段来判断)
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

-- 调度设置的时候更新人员状态
-- EPM_EmployeeList 里的active = 1
-- trace_Timer 里的active = 1
-- trace_users 里的traceduration 清0
-- 执行例子: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 -- 任何一部有问题是都会回滚事务
BEGIN TRANSACTION -- 开始事务
update EPM_EmployeeList set activeStatus = 0 where corpid = @nCorpId and activeStatus != 0
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
   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 )
( ' +@vchEmployeeIds+ ' )) '
   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 --提交事务
GO

--导出企业根据大类别。四个表就晕了。。。。。。。

--插入到临时表里
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.需要两次是因为无法对类别(大类)进行排序
select case when type IS NULL then '未知类别' else type end as 大类别,corpname as 名称 ,corplinkman as 联系人,phonenumber as 联系电话,address as 地址 ,createTime as 创建时间 into Table1 from #table2
order by type
----删除临时表
drop table #table2

好的方法????找不到........可能是数据库设计的不好.

通过另一个表来更新本表的记录.
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子句中如何写变量的表达式问题

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