Variable length string SQL

Question

I have the following data:

String
K40 
I84 
G401    
M232    
L72 

And I am looking to obtain the following output

String
K40 
I84 
G40 
M23 
L72 

Where those will a length of 4 are reduced by one. And those of length 3 are retained. The code I have used thus far is:

(left([string], len([string]) - 1))

However, this alters the string irrespective of length.

Using SQL Server 2008.

Many thanks

Answer 1

尝试这个：-

SELECT LEFT(YOUR_COLUMN, 3) FROM YOUR_TABLE;

Answer 2

SELECT SUBSTRING(YOUR_COLUMN, 1, 3) As AliasName from TableName