SQL常用的函数
SQL Server提供了大量的函数,
但是在一些常见的如,
字符串拆分,
字符提取,过滤等没有对应的处理,
本帖主要收集一些常见的函数,
整理如下:
------------------------------
http://topic.csdn.net/u/20080306/23/d3c100f2-cda1-4efa-927d-f1f7968884ce.html
/*
功能:拆分字符串.
作者:.....
*/
http://topic.csdn.net/u/20080724/11/dacb530f-62ba-4417-a11a-fe2dee2172b4.html
/*
功能:根据身份证号码取得此CID所在省份
作者:happyflystone
*/
http://topic.csdn.net/u/20080713/00/77925c47-b7fa-4c1b-b307-0328e74a1c09.html
/*
功能:提取数字
功能:提取英文
功能:提取中文
功能:过滤重复字符
功能:过滤重复字符2
作者:wzy_love_sly
*/
MS SQL Server vs Oracle函数
http://topic.csdn.net/u/20071022/09/477d57b8-1127-4159-8975-2055343c624f.html
sql 函数 md5
http://topic.csdn.net/u/20080619/09/4fb22d1b-f88e-487e-8b74-cf394263fc40.html
求sql取字符串的首字母的函数
http://topic.csdn.net/u/20080623/11/22a3f568-d37e-4bf5-9c13-64171066f582.html
形如1,2,3,4,5,6的字符串转换成行
http://topic.csdn.net/u/20080621/08/3397be02-47cd-40c3-9834-600cbb84c0bf.html
小写金额转换成大写
http://topic.csdn.net/u/20080118/11/80ff7847-20d9-45d8-9ed6-79933ced2cf8.html
整数转换成二进制的函数
http://topic.csdn.net/u/20071108/22/1650e0ef-3c14-4710-b2db-075f1e0badf3.html
SQLserver中实现一个函数，能够将10进制转化为36进制
http://topic.csdn.net/u/20070612/16/05e8b690-0818-479d-a34d-ee6258da4027.html
http://blog.csdn.net/roy_88/archive/2007/11/13/1882106.aspx
/*
功能:十进制/十八进制的互转换(此方法应用于所有进制与10进制的转换)
作者:roy_88
*/
http://topic.csdn.net/u/20080715/10/548c6e12-731f-4e54-ac13-d05325068032.html
/*
功能:整数转换成二进制的函数
作者:happyflystone
*/
SQL Server里面有十六进制转化为十进制的函数吗
http://topic.csdn.net/u/20070116/10/0c7d9ec1-acaa-4918-86cd-51516f7f517f.html
SQL2000加密解密函数
http://topic.csdn.net/t/20041202/20/3610469.html
想通过一个函数或sql语句，随机生成任意6个字母组成的字符
http://topic.csdn.net/u/20070627/17/ea906673-9821-46c6-b351-ab98a0b3d2c4.html
求一个sql函数：计算时间差（除周六和周日外）的天数
http://topic.csdn.net/u/20070322/12/2a8d5fcf-2d5b-49e1-b58a-c7277e15ee95.html
Ip算法匹配
http://topic.csdn.net/u/20080711/15/66639249-52d9-40c6-8f5c-131e49c1a6cf.html
http://topic.csdn.net/u/20080801/11/506af00d-b882-41a2-99d9-4dc6927101fd.html
http://blog.csdn.net/dobear_0922/archive/2007/12/18/1947219.aspx
/*
功能:SQL日历函数.
作者:dobear_0922
*/
http://topic.csdn.net/u/20080505/20/d2dffbbe-6d6b-41cf-b29a-41149540eafa.html
/*
功能:两个支持text字段内文字替换的存储过程
作者:realgz
*/
MS SQL Server 2000 中文模糊搜寻存储过程及函数
http://www.cppfans.com/d_vcl_files/mssqlxp_chn.asp
http://topic.csdn.net/t/20050419/10/3948336.html
/*
功能:全角/半角转换
*/
http://topic.csdn.net/u/20080612/22/c850499f-bce3-4877-82d5-af2357857872.html
/*
功能:合并与拆分
整理者:roy_88
*/
http://topic.csdn.net/u/20080605/11/55c273aa-2206-4ded-b6f6-508a7a755c6a.html
/*
功能:自定义函数，用户可以调用这个函数判断指定的字符串是否符合正则表达式的规则.
作者:ranzj
*/
T - SQL: 15 个与日期时间相关的精典语句函数 T - SQL: 15 个与日期时间相关的自定义函数(UDF),周日作为周的最后一天,均不受 @@DateFirst 、语言版本影响 都是从老文章里收集或提炼出来的! 提示: ( @@Datefirst + datepart (weekday, @Date )) % 7 判断周几是最保险的! 与 @@DateFirst 无关,与语言版本无关 @@DateFirst 可能会导致 datepart (weekday, @Date ) 不一样! 无论 @@DateFirst 等于几,无论是什么语言版本的 SQL Server 下面永远恒成立! ( @@Datefirst + datepart (weekday, @Date )): 2 、 3 、 4 、 5 、 6 、 0 、 1 分别代表 周一 到 周日 -- */ create function udf_GetAge( @StartDate datetime , @EndDate datetime ) returns integer -- 返回精确年龄 select dbo.udf_GetAge('1949-10-01',getdate()) begin return datediff ( year , @StartDate , @EndDate ) - case when datediff ( day , dateadd ( year , datediff ( year , @StartDate , @EndDate ), @StartDate ), @EndDate ) >= 0 then 0 else 1 end end go create function udf_DaysOfYearByDate( @Date datetime ) RETURNS integer -- 返回年的天数 可判断 平(365)、润(366) 年 begin return datediff ( day , dateadd ( year , datediff ( year , 0 , @Date ), 0 ), dateadd ( year , datediff ( year , 0 , @Date ) + 1 , 0 )) end go create function udf_DaysOfYear( @Year integer ) RETURNS integer -- 返回年的天数 可判断 平(365)、润(366) 年 begin return datediff ( day , dateadd ( year , @year - year ( 0 ), 0 ), dateadd ( year , @year - year ( 0 ) + 1 , 0 )) end go create function udf_HalfDay( @Date datetime ) returns datetime -- 返回 @Date 是 上午 返回 @Date 的零点,@Date 是 下午 返回 @Date 的十二点 as begin return case when datepart (hour, @Date ) go create function udf_WeekDiff( @StartDate datetime , @EndDate datetime ) returns integer -- 返回 [@StartDate , @EndDate] 之间周数 周日是当周的最后一天 begin return datediff (week, @StartDate , @EndDate ) -- + 1 + case when ( @@Datefirst + datepart (weekday, @StartDate )) % 7 = 1 then 1 else 0 end - case when ( @@Datefirst + datepart (weekday, @EndDate )) % 7 = 1 then 1 else 0 end end go create function udf_WeekOfMonth( @Date datetime ) -- 返回 @Date 是所在月的第几周 周日是当周的最后一天 returns integer as begin return datediff (week , case when ( @@Datefirst + datepart (weekday, dateadd ( month , datediff ( month , 0 , @Date ), 0 ))) % 7 = 1 then dateadd ( month , datediff ( month , 0 , @Date ), 0 ) - 1 else dateadd ( month , datediff ( month , 0 , @Date ), 0 ) end , case when ( @@Datefirst + datepart (weekday, @Date )) % 7 = 1 then @Date - 1 else @Date end ) + 1 end go create function udf_WeekOfQuarter( @Date datetime ) -- 返回 @Date 是所在季度的第几周 周日是当周的最后一天 returns int as begin return datediff (week , case when ( @@Datefirst + datepart (weekday, dateadd (Quarter, datediff (Quarter, 0 , @Date ), 0 ))) % 7 = 1 then dateadd (Quarter, datediff (Quarter, 0 , @Date ), 0 ) - 1 else dateadd (Quarter, datediff (Quarter, 0 , @Date ), 0 ) end , case when ( @@Datefirst + datepart (weekday, @Date )) % 7 = 1 then @Date - 1 else @Date end ) + 1 end go create function udf_WeekOfYear( @Date datetime ) -- 返回 @Date 是所在年的第几周 周日是当周的最后一天 returns int as begin return datediff (week , case when ( @@Datefirst + datepart (weekday, dateadd ( day , 0 , datediff ( day , 0 , dateadd ( year , datediff ( year , 0 , @Date ), 0 ))))) % 7 = 1 then dateadd ( day , - 1 , dateadd ( day , 0 , datediff ( day , 0 , dateadd ( year , datediff ( year , 0 , @Date ), 0 )))) else dateadd ( day , 0 , datediff ( day , 0 , dateadd ( year , datediff ( year , 0 , @Date ), 0 ))) -- date 所在年的第一天 即: 一月一号 end , case when ( @@Datefirst + datepart (weekday, @Date )) % 7 = 1 then dateadd ( day , - 1 , @Date ) else @Date end ) + 1 end go create function udf_WeekDay(@ int , @Date datetime ) returns datetime -- 返回 @Date 映射到 所在周的其他天 周日是当周的最后一天 begin /* --周日算作(上一)周的最后一天 当 @ = 7 代表将 @Date 映射到 所在周的星期日 可用于按周汇总 Group by,均支持跨年跨月数据 */ return dateadd ( day , case when ( @@Datefirst + datepart (weekday, @Date )) % 7 = 0 -- 周六 then case when @ between 1 and 6 then @ - 6 else 1 end when ( @@Datefirst + datepart (weekday, @Date )) % 7 = 1 -- 周日(七) then case when @ between 1 and 6 then @ - 7 else 0 end when ( @@Datefirst + datepart (weekday, @Date )) % 7 between 2 and 6 -- 周一至周五 then case when @ between 1 and 6 then @ + 1 - ( @@Datefirst + datepart (weekday, @Date )) % 7 else 8 - ( @@Datefirst + datepart (weekday, @Date )) % 7 end end , @Date ) end go create function udf_WeekdayDiff( @Weekday integer , @StartDate datetime , @EndDate datetime ) returns integer -- -- 返回 [@StartDate , @EndDate] 之间周一 到 周日的个数 周日是当周的最后一天 begin -- @Weekday: 1: Monday , ... ,7: Sunday return datediff (week, @StartDate , @EndDate ) + case when ( @@Datefirst + datepart (weekday, @StartDate )) % 7 + case when ( @@Datefirst + datepart (weekday, @StartDate )) % 7 = 0 then 7 else 0 end > @Weekday % 7 + 1 then 0 else 1 end - case when ( @@Datefirst + datepart (weekday, @EndDate )) % 7 + case when ( @@Datefirst + datepart (weekday, @EndDate )) % 7 = 0 then 7 else 0 end >= @Weekday % 7 + 1 then 0 else 1 end /* test: declare @b datetime declare @e datetime set @b = '2004-01-29' set @e = '2004-09-05' select @b as BeginDate ,@e as EndDate ,dbo.udf_WeekdayDiff(1,@b,@e) as CountOfMonday ,dbo.udf_WeekdayDiff(2,@b,@e) as CountOfTuesday ,dbo.udf_WeekdayDiff(3,@b,@e) as CountOfWednesday ,dbo.udf_WeekdayDiff(4,@b,@e) as CountOfThursday ,dbo.udf_WeekdayDiff(5,@b,@e) as CountOfFriday ,dbo.udf_WeekdayDiff(6,@b,@e) as CountOfSaturday ,dbo.udf_WeekdayDiff(7,@b,@e) as CountOfSunday */ end go create function udf_WeekdayID( @Date datetime ) returns integer -- 返回 @Date 是 Monday 返回 1, ... ,是 Sunday 返回 1 begin -- 1: Monday , ... ,7: Sunday return ( @@Datefirst + datepart (weekday, @Date )) % 7 + case when ( @@Datefirst + datepart (weekday, @Date )) % 7 go create function udf_NextWorkDate( @Date datetime ) returns datetime -- 返回 @Date 的下一个工作日 begin /* declare @i int set @i = 3 declare @Date datetime set @Date = '2005-01-02' -- */ return case when ( @@Datefirst + datepart (weekday, @Date )) % 7 = 6 -- Friday then dateadd ( day , 3 , @Date ) when ( @@Datefirst + datepart (weekday, @Date )) % 7 = 0 -- saturday then dateadd ( day , 2 , @Date ) else dateadd ( day , 1 , @Date ) end end go
SQL code
create
function
udf_PreviousWorkDate(
@Date
datetime
)
returns
datetime
--
返回 @Date 的上一个工作日
begin
/*
declare @i int set @i = 3 declare @Date datetime set @Date = '2005-01-02' --
*/
return
case
when
(
@@Datefirst
+
datepart
(weekday,
@Date
))
%
7
=
2
--
Monday
then
dateadd
(
day
,
-
3
,
@Date
)
when
(
@@Datefirst
+
datepart
(weekday,
@Date
))
%
7
=
1
--
Sunday
then
dateadd
(
day
,
-
2
,
@Date
)
else
dateadd
(
day
,
-
1
,
@Date
)
end
end
go
create
function
udf_WorkDateAdd(
@i
integer
,
@Date
datetime
)
returns
datetime
--
返回 @Date 加上一段 @i 个工作日的新值
begin
declare
@
int
set
@
=
0
while
@
=
0
then
--
dbo.udf_nextworkdate(@Date)
case
when
(
@@Datefirst
+
datepart
(weekday,
@Date
))
%
7
=
6
--
Friday
then
dateadd
(
day
,
3
,
@Date
)
when
(
@@Datefirst
+
datepart
(weekday,
@Date
))
%
7
=
0
--
saturday
then
dateadd
(
day
,
2
,
@Date
)
else
dateadd
(
day
,
1
,
@Date
)
end
else
--
dbo.udf_previousworkdate(@Date)
case
when
(
@@Datefirst
+
datepart
(weekday,
@Date
))
%
7
=
2
--
Monday
then
dateadd
(
day
,
-
3
,
@Date
)
when
(
@@Datefirst
+
datepart
(weekday,
@Date
))
%
7
=
1
--
Sunday
then
dateadd
(
day
,
-
2
,
@Date
)
else
dateadd
(
day
,
-
1
,
@Date
)
end
end
set
@
=
@
+
1
end
return
@Date
end
go
create
function
udf_GetStar (@
datetime
)
RETURNS
varchar
(
100
)
--
返回日期所属星座
BEGIN
RETURN
(
--
declare @ datetime
--
set @ = getdate()
select
max
(star)
from
(
select
'
魔羯座
'
as
star,
1
as
[
month
]
,
1
as
[
day
]
union
all
select
'
水瓶座
'
,
1
,
20
union
all
select
'
双鱼座
'
,
2
,
19
union
all
select
'
牡羊座
'
,
3
,
21
union
all
select
'
金牛座
'
,
4
,
20
union
all
select
'
双子座
'
,
5
,
21
union
all
select
'
巨蟹座
'
,
6
,
22
union
all
select
'
狮子座
'
,
7
,
23
union
all
select
'
处女座
'
,
8
,
23
union
all
select
'
天秤座
'
,
9
,
23
union
all
select
'
天蝎座
'
,
10
,
24
union
all
select
'
射手座
'
,
11
,
22
union
all
select
'
魔羯座
'
,
12
,
22
) stars
where
dateadd
(
month
,
[
month
]
-
1
,
dateadd
(
year
,
year
(@)
-
year
(
0
),
0
))
+
[
day
]
-
1
=
(
select
max
(
dateadd
(
month
,
[
month
]
-
1
,
dateadd
(
year
,
year
(@)
-
year
(
0
),
0
))
+
[
day
]
-
1
)
from
(
select
'
魔羯座
'
as
star,
1
as
[
month
]
,
1
as
[
day
]
union
all
select
'
水瓶座
'
,
1
,
20
union
all
select
'
双鱼座
'
,
2
,
19
union
all
select
'
牡羊座
'
,
3
,
21
union
all
select
'
金牛座
'
,
4
,
20
union
all
select
'
双子座
'
,
5
,
21
union
all
select
'
巨蟹座
'
,
6
,
22
union
all
select
'
狮子座
'
,
7
,
23
union
all
select
'
处女座
'
,
8
,
23
union
all
select
'
天秤座
'
,
9
,
23
union
all
select
'
天蝎座
'
,
10
,
24
union
all
select
'
射手座
'
,
11
,
22
union
all
select
'
魔羯座
'
,
12
,
22
) stars
where
@
>=
dateadd
(
month
,
[
month
]
-
1
,
dateadd
(
year
,
year
(@)
-
year
(
0
),
0
))
+
[
day
]
-
1
) )
end
SQL Server 日期算法 一周的第一天
select
@@DATEFIRST
一个月的第一天
select
dateadd
(mm,
datediff
(mm,
0
,
getdate
()),
0
) 本周的星期一
select
dateadd
(wk,
datediff
(wk,
0
,
getdate
()),
0
) 一年的第一天
SELECT
DATEADD
(yy,
DATEDIFF
(yy,
0
,
getdate
()),
0
) 季度的第一天
SELECT
DATEADD
(qq,
DATEDIFF
(qq,
0
,
getdate
()),
0
) 当天的零时
SELECT
DATEADD
(dd,
DATEDIFF
(dd,
0
,
getdate
()),
0
) 上个月的最后一天 ：本月第一天减2ms.
SELECT
dateadd
(ms,
-
2
,
DATEADD
(mm,
DATEDIFF
(mm,
0
,
getdate
()),
0
)) 本月的最后一天
SELECT
dateadd
(ms,
-
2
,
DATEADD
(mm,
DATEDIFF
(m,
0
,
getdate
())
+
1
,
0
)) 本月的第一个星期一 去掉时分秒
DATEADD
(
day
,
DATEDIFF
(
day
,
0
,
getdate
()),
0
) 显示星期几
select
datename
(weekday,
getdate
()) 如何取得某个月的天数
SELECT
Day
(
dateadd
(ms,
-
3
,
DATEADD
(mm,
DATEDIFF
(m,
0
,
getdate
())
+
1
,
0
))) 判断是否闰年：
SELECT
case
day
(
dateadd
(mm,
2
,
dateadd
(ms,
-
3
,
DATEADD
(yy,
DATEDIFF
(yy,
0
,
getdate
()),
0
))))
when
28
then
'
平年
'
else
'
闰年
'
end
一个季度多少天
declare
@m
tinyint
,
@time
smalldatetime
select
@m
=
month
(
getdate
())
select
@m
=
case
when
@m
between
1
and
3
then
1
when
@m
between
4
and
6
then
4
when
@m
between
7
and
9
then
7
else
10
end
select
@time
=
datename
(
year
,
getdate
())
+
'
-
'
+
convert
(
varchar
(
10
),
@m
)
+
'
-01
'
select
datediff
(
day
,
@time
,
dateadd
(mm,
3
,
@time
))
/*
=============================================
*/
/*
Author: roy_88
*/
--
2 实现全角与半角字符转换的处理函数
CREATE
FUNCTION
f_Convert(
@str
NVARCHAR
(
4000
),
--
要转换的字符串
@flag
bit
--
转换标志,0转换成半角,1转换成全角
)
RETURNS
nvarchar
(
4000
)
AS
BEGIN
DECLARE
@pat
nvarchar
(
8
),
@step
int
,
@i
int
,
@spc
int
IF
@flag
=
0
SELECT
@pat
=
N
'
%[！-～]%
'
,
@step
=-
65248
,
@str
=
REPLACE
(
@str
,N
'
'
,N
'
'
)
ELSE
SELECT
@pat
=
N
'
%[!-~]%
'
,
@step
=
65248
,
@str
=
REPLACE
(
@str
,N
'
'
,N
'
'
)
SET
@i
=
PATINDEX
(
@pat
COLLATE LATIN1_GENERAL_BIN,
@str
)
WHILE
@i
>
0
SELECT
@str
=
REPLACE
(
@str
,
SUBSTRING
(
@str
,
@i
,
1
),
NCHAR
(
UNICODE
(
SUBSTRING
(
@str
,
@i
,
1
))
+
@step
)) ,
@i
=
PATINDEX
(
@pat
COLLATE LATIN1_GENERAL_BIN,
@str
)
RETURN
(
@str
)
END
GO
declare
T_cursor
cursor
local
for
select
a.Name, b.Name
from
sysobjects a
join
syscolumns b
on
a.ID
=
b.ID
join
systypes c
on
c.xusertype
=
b.Xtype
where
a.xtype
=
'
U
'
and
c.Name
in
(
'
nvarchar
'
,
'
nchar
'
,
'
varchar
'
,
'
char
'
)
declare
@tabName
sysname,
@ColName
sysname
open
T_cursor
fetch
next
from
T_cursor
into
@tabName
,
@ColName
while
@@fetch_status
=
0
begin
exec
(
'
update
'
+
@tabName
+
'
set
'
+
@ColName
+
'
=dbo.f_Convert(
'
+
@ColName
+
'
,0) where PATINDEX(N
''
%[！-～]%
''
COLLATE LATIN1_GENERAL_BIN
'
+
'
,
'
+
@ColName
+
'
)>0
'
fetch
next
from
T_cursor
into
@tabName
,
@ColName
end
close
T_cursor
deallocate
T_cursor
--
-------------------------------------
--
改列的数据全角为半角
declare
T_cursor
cursor
local
for
select
a.Name, b.Name
from
sysobjects a
join
syscolumns b
on
a.ID
=
b.ID
join
systypes c
on
c.xusertype
=
b.Xtype
where
a.xtype
=
'
U
'
and
c.Name
in
(
'
nvarchar
'
,
'
nchar
'
,
'
varchar
'
,
'
char
'
)
declare
@tabName
sysname,
@ColName
sysname
open
T_cursor
fetch
next
from
T_cursor
into
@tabName
,
@ColName
while
@@fetch_status
=
0
begin
exec
(
'
update
'
+
@tabName
+
'
set
'
+
@ColName
+
'
=dbo.f_Convert(
'
+
@ColName
+
'
,0) where PATINDEX(N
''
%[！-～]%
''
COLLATE LATIN1_GENERAL_BIN
'
+
'
,
'
+
@ColName
+
'
)>0
'
)
--
少了)
fetch
next
from
T_cursor
into
@tabName
,
@ColName
end
close
T_cursor
deallocate
T_cursor
go
--
改列名全角为半角
declare
T_cursor
cursor
local
for
select
a.Name, b.Name
from
sysobjects a
join
syscolumns b
on
a.ID
=
b.ID
where
a.xtype
=
'
U
'
and
PATINDEX
(N
'
%[！-～]%
'
COLLATE LATIN1_GENERAL_BIN,b.Name)
>
0
declare
@tabName
sysname,
@ColName
sysname
open
T_cursor
fetch
next
from
T_cursor
into
@tabName
,
@ColName
while
@@fetch_status
=
0
begin
exec
(
'
exe sp_rename
'''
+
@tabName
+
'
.
'
+
@ColName
+
'''
,
''
dbo.f_Convert(
'
+
@ColName
+
'
,0)
'''
)
fetch
next
from
T_cursor
into
@tabName
,
@ColName
end
close
T_cursor
deallocate
T_cursor
--
----------------------------------------------------
--
改列名全角为半角
declare
T_cursor
cursor
local
for
select
a.Name
+
'
.
'
+
b.Name,NameNew
=
dbo.f_Convert(b.Name)
from
sysobjects a
join
syscolumns b
on
a.ID
=
b.ID
where
a.xtype
=
'
U
'
and
PATINDEX
(N
'
%[！-～]%
'
COLLATE LATIN1_GENERAL_BIN,b.Name)
>
0
declare
@tabName
sysname,
@ColName
sysname
open
T_cursor
fetch
next
from
T_cursor
into
@tabName
,
@ColName
while
@@fetch_status
=
0
begin
exe sp_rename
@tabName
,
@ColName
fetch
next
from
T_cursor
into
@tabName
,
@ColName
end
close
T_cursor
deallocate
T_cursor
SQL code