各位大侠,数据库有个表
0101X
0102Y
0103Z
....
现在需要通过Sql求每个项的最后一个英文字母的前置字符即这样的结果集, 如果最后一个是A那么还是保持是A
0101W
0102X
0103Y
....各位大大有什么好的方法吗 谢谢。
0101X
0102Y
0103Z
....
现在需要通过Sql求每个项的最后一个英文字母的前置字符即这样的结果集, 如果最后一个是A那么还是保持是A
0101W
0102X
0103Y
....各位大大有什么好的方法吗 谢谢。
调试欢乐多
case when right(col,1)<>'a' then char(ascii(right(col,1))-1)
else 'a' end
from tbname
-- Author :fredrickhu(小F,向高手学习)
-- Date :2010-03-25 09:31:35
-- Verstion:
-- Microsoft SQL Server 2005 - 9.00.4035.00 (Intel X86)
-- Nov 24 2008 13:01:59
-- Copyright (c) 1988-2005 Microsoft Corporation
-- Developer Edition on Windows NT 5.1 (Build 2600: Service Pack 3)
--
----------------------------------------------------------------
--> 测试数据:[tb]
if object_id('[tb]') is not null drop table [tb]
go
create table [tb]([col] varchar(5))
insert [tb]
select '0101X' union all
select '0102Y' union all
select '0103Z' union all
select '0104A'
--------------开始查询--------------------------
select ltrim(left(col,3))+case when right(col,1)='a' then 'a' else char(ascii(right(col,1))-1) end from [tb]
----------------结果----------------------------
/* ------
010W
010X
010Y
010a(4 行受影响)
*/
-- Author :fredrickhu(小F,向高手学习)
-- Date :2010-03-25 09:31:35
-- Verstion:
-- Microsoft SQL Server 2005 - 9.00.4035.00 (Intel X86)
-- Nov 24 2008 13:01:59
-- Copyright (c) 1988-2005 Microsoft Corporation
-- Developer Edition on Windows NT 5.1 (Build 2600: Service Pack 3)
--
----------------------------------------------------------------
--> 测试数据:[tb]
if object_id('[tb]') is not null drop table [tb]
go
create table [tb]([col] varchar(5))
insert [tb]
select '0101X' union all
select '0102Y' union all
select '0103Z' union all
select '0104A'
--------------开始查询--------------------------
select ltrim(left(col,4))+case when right(col,1)='a' then upper('a') else char(ascii(right(col,1))-1) end from [tb]
----------------结果----------------------------
/*
-------
0101W
0102X
0103Y
0104A(4 行受影响)*/
case when upper(right(col,1))<>'A' then char(ascii(upper(right(col,1)))-1)
else 'A' end
from tbname
if object_id('[tb]') is not null drop table [tb]
go
create table [tb]([col] varchar(5))
insert [tb]
select '0101X' union all
select '0102Y' union all
select '0103Z' union all
select '0104A'
SELECT * FROM dbo.TBSELECT CASE
WHEN char(ascii(right(col,1))-1) = '@' THEN col
ELSE LEFT(col,4)+char(ascii(right(col,1))-1) END
FROM tb
/*0101W
0102X
0103Y
0104A*/
go
create table [tb]([col] varchar(5))
insert [tb]
select '0101X' union all
select '0102Y' union all
select '0103Z' union all
select '0104A'select
case when right([col],1)<>'a' then left([col],4)+char(ascii(right([col],1))-1) else [col] end [col]
from [tb]col
------
0101W
0102X
0103Y
0104A(4 行受影响)
INSERT @a SELECT '0101X'
union all select '0102Y'
union all select '0103Z'
UNION ALL SELECT '0104a'
UNION ALL SELECT '0105A'
UNION ALL SELECT '0106B'
UNION ALL SELECT '0107b'
SELECT case when right(a COLLATE chinese_prc_cs_as,1) in('a','A') THEN a
ELSE left(a,4)+ char(ascii(right(a COLLATE chinese_prc_cs_as,1))-1) end
FROM @a
--result
/*------
0101W
0102X
0103Y
0104a
0105A
0106A
0107a (所影响的行数为 7 行)*/
insert #tb
select '0101X' union all
select '0102Y' union all
select '0103Z' union all
select '0104A'
select * from #tb
select left(col,4)+case when right(col,1)='a' then 'a' else char(ascii(right(col,1))-1) end
from #tb