将字符插入SQL字符串 [英] Insert character into SQL string

问题描述

我有一个nvarchar列，我需要在字符串内的固定点插入连字符.连字符必须位于最右边的字符和下一个字符之间，并再次位于右边的第3个位置，例如: 列值为

0000050704 

我需要成为

0000050-70-4

或值为

0555256321 

它应该是

0555256-32-1

看不到如何完成.谁能给我一点帮助?

解决方案

假设字符串可以是可变长度，则需要在表达式中使用REVERSE()或很多讨厌的LEN()值.

declare @txt varchar(100) = '0000050704'

--If using SQL Server, the STUFF() function is your friend
select REVERSE(STUFF(STUFF(REVERSE(@txt), 2, 0, '-'), 5, 0, '-'))

--if not you'll need to concatenate SUBSTRING()s
select REVERSE(SUBSTRING(REVERSE(@txt), 1, 1) + '-' + SUBSTRING(REVERSE(@txt),2, 2) + '-' + SUBSTRING(REVERSE(@txt),4, LEN(@txt)))

I have an nvarchar column I need to insert a hyphen at fixed points within the string. The hyphen need to go between the rightmost character and the next, and again in the 3rd position from the right, such as: column value is

0000050704 

and I need it to be

0000050-70-4

or value is

0555256321 

and it should be

0555256-32-1

Can't see how this is done. Can anyone give me a little help?

解决方案

Assuming the strings can be a variable length, you'll need to use REVERSE() or lots of nasty looking LEN() values in your expression.

declare @txt varchar(100) = '0000050704'

--If using SQL Server, the STUFF() function is your friend
select REVERSE(STUFF(STUFF(REVERSE(@txt), 2, 0, '-'), 5, 0, '-'))

--if not you'll need to concatenate SUBSTRING()s
select REVERSE(SUBSTRING(REVERSE(@txt), 1, 1) + '-' + SUBSTRING(REVERSE(@txt),2, 2) + '-' + SUBSTRING(REVERSE(@txt),4, LEN(@txt)))

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