一个SQL Group问题
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:
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.)
代码
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
31
GROUP
BY
a.
number
order
by
DAY
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- -..)
代码
CREATE
function
[
dbo
]
.
[
CN80s_FN_GetOrderType
]
(
@tabName
nvarchar
(
2000
),
@keyOrder
nvarchar
(
255
)
)
returns
nvarchar
(
100
)
as
begin
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
@OrderType
end
GO
函数2(这个更长)
代码
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
代码
SELECT
a.
day
,
isnull
(BidsCombo_Price,
0
)
as
BidsCombo_Price,
isnull
( BidsTrade_Count,
0
)
as
BidsTrade_Count
FROM
(
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
第一篇blog文..请各位看官多多包涵..!