在前一段时间中遇到一个需求..统计某一种商品在某一天中的销售数量,当天没有销售的时候,数量显示0.
这个不能用一般的Group来实现.所以需要变通一下,跟一个有1-31的一个集合来Group.
有2种方案.
planA:
- SELECT SUM(ISNULL(BidsTrade_Money, 0))
- AS [MONEY], a.number
- AS [DAY]FROM MASTER..spt_values a
- LEFT JOIN DDPM_T_Comm_BidsTrade b
- ON a.type = 'p'
- AND month([BidsTrade_DateCreated])='5'
- AND a.number = DAY(b.[BidsTrade_DateCreated])
- AND YEAR([BidsTrade_DateCreated]) = '2010'
- WHERE a.number BETWEEN 1 AND 31GROUP BY a.numberorder by DAY
使用MASTER..spt_values(产生一定范围的数字的数字,这里需要产生1-31的数字.)
但是这一种方法有缺陷,每一个月不一定都是31天.并且我们配置的SQL账号不一定有权限来访问这个函数.
planB:.通过自定义函数.
自定义函数GetOrderType(比较长- -..)
- CREATE function [dbo].[CN80s_FN_GetOrderType]( @tabName nvarchar(2000),
- @keyOrder nvarchar(255))returns nvarchar(100)asbegin declare @OrderTable nvarchar(255) --表名
- declare @OrderName nvarchar(255) --字段名
- declare @OrderType nvarchar(255) --字段类型
- declare @OrderPrec nvarchar(50) --字段长度
- declare @OrderDot int --点的位置
- declare @s1 nvarchar(100) -- 临时变量1
- declare @s2 nvarchar(100) -- 临时变量2 --去除排序规则
- set @keyorder=REPLACE(@keyorder, ' asc', '') --求表名、字段名
- set @OrderDot=CHARINDEX('.', @keyorder)
- IF @OrderDot > 0
- BEGIN
- SET @OrderTable = SUBSTRING(@keyorder, 0, @OrderDot)
- SET @OrderName = SUBSTRING(@keyorder, @OrderDot + 1, LEN(@keyorder))
- END
- ELSE
- BEGIN
- SET @OrderTable = @tabName
- SET @OrderName = @keyorder
- END --去除方括号 set @s1=REPLACE(REPLACE (@OrderTable,'[',''),']','')
- set @s2=REPLACE(REPLACE (@OrderName,'[',''),']','') --求字段类型、字段长度
- SELECT @OrderType=t.[name], @OrderPrec=c.prec
- FROM sysobjects o
- JOIN syscolumns c on o.id=c.id
- JOIN systypes t on c.xusertype=t.xusertype
- WHERE o.name = @s1 AND c.[name] = @s2
- if @OrderType is null begin
- SET @OrderType='Sql_Variant'
- end else begin
- IF CHARINDEX('char', @OrderType) > 0
- SET @OrderType = @OrderType + '(' + CAST(@OrderPrec AS nvarchar) + ')'
- end return @OrderTypeendGO
函数2(这个更长)
USE [ CN80s.DDPM ]
GO
/* ***** Object: UserDefinedFunction [dbo].[FormatDateTime] Script Date: 08/01/2010 16:28:23 ***** */
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE function [ dbo ] . [ FormatDateTime ] ( @Date datetime , @formatStr varchar ( 20 ))
returns varchar ( 16 )
as
begin
declare @tempstr varchar ( 20 ), @index int , @retStr varchar ( 20 ), @formatLen int , @str1 varchar ( 6 ), @str2 varchar ( 6 ), @str3 varchar ( 6 ), @j int
declare @tempformat varchar ( 20 )
select @tempformat = @formatStr , @formatStr = Upper ( @formatStr ), @index =- 1 , @retstr = ''
if @formatStr = ' MM/DD/YYYY '
set @retstr = convert ( varchar ( 10 ), @date , 101 )
else if @formatstr = ' YYYY-MM-DD '
set @retstr = Convert ( char ( 10 ), @Date , 20 )
else if @formatStr = ' YYYY.MM.DD '
set @retstr = Convert ( varchar ( 10 ), @Date , 102 )
else if @formatStr = ' YYYY/MM/DD '
set @retstr = Convert ( varchar ( 10 ), @Date , 111 )
else if @formatStr = ' DD/MM/YYYY '
set @retstr = Convert ( varchar ( 10 ), @Date , 103 )
else if @formatStr = ' DD.MM.YYYY '
set @retstr = Convert ( varchar ( 10 ), @Date , 104 )
else if @formatStr = ' DD-MM-YYYY '
set @retstr = Convert ( varchar ( 10 ), @Date , 105 )
else if @formatStr = ' YYYYMMDD '
set @retstr = Convert ( varchar ( 10 ), @Date , 112 )
else
begin
select @tempformat = @formatStr , @formatLen = len ( @formatStr )
if @formatLen > 8
begin
set @index = charindex ( ' M ' , @tempformat )
select @str1 =right ( left ( @tempformat , @index - 1 ), @index - 5 ), @str2 =right ( @tempformat , @formatLen - @index - 1 )
select @index = charindex ( ' D ' , @str2 ), @str3 = @str2
set @str2 =left ( @str2 , @index - 1 )
set @str3 =right ( @str3 , len ( @str3 ) - @index - 1 )
end
select @tempstr = Convert ( char ( 10 ), @Date , 20 ), @str1 = isnull ( @str1 , '' ), @str2 = isnull ( @str2 , '' ), @str3 = isnull ( @str3 , '' ), @j = 0
while @index <> 0
begin
set @index = charindex ( ' - ' , @tempstr )
if @j = 0
select @retstr =left ( @tempstr , @index - 1 ) + @str1 , @j = @j + 1
else set @retstr = @retstr +left ( @tempstr , @index - 1 ) + @str2
select @tempstr =right ( @tempstr , len ( @tempstr ) - @index )
set @index = charindex ( ' - ' , @tempstr )
end
set @retstr = @retstr + @tempstr + @str3
end
return @retstr
end
GO
可以看看调用这个函数的结果.
- SELECT * FROM CN80s_DDPM_FN_GETDATE('2010-05-1','2010-05-31',null)
参数依次为:开始时间,结束时间,显示状态(null:显示所有日期,0显示所有工作日(星期一~星期五),1:显示周末,2显示周末)
当然这个函数有其他的扩展应用请各位看官天马行空.~
实际应用,这里写了一个存储过程
- SELECT a.day , isnull(BidsCombo_Price,0) as
- BidsCombo_Price, isnull( BidsTrade_Count,0) as
- BidsTrade_CountFROM (
- SELECT year(Date) as year,month(Date) as month,day(Date) as [day]
- FROM dbo.CN80s_DDPM_FN_GETDATE(@beginTime,@endTime,NULL) ) a
- LEFT JOIN
- DDPM_V_BidsTradeRecount b
- ON a.day = b.day
- AND a.year=b.year
- AND a.month=b.month GO
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