Update substring of a column

Question

I have a table within a SQL Server 2008 database called Meter. This table has a column called Name.

Each entry within the column Nam

Answer 1

MYSQL:

UPDATE Meter
SET Name = CONCAT('ZAA' ,'_', SUBSTRING(Name, 4, LENGTH(Name)))
WHERE Name LIKE 'ZAA\%'

Answer 2

UPDATE Meter
SET Name = 'ZAA_' + SUBSTRING(Name, 4, LEN(Name))
WHERE SUBSTRING(Name, 1, 4) = 'ZAA\'

Edit:

Or as @Damien_The_Unbliever states, to use an index:

UPDATE Meter
SET Name = 'ZAA_' + SUBSTRING(Name, 4, LEN(Name))
WHERE Name LIKE 'ZAA\%'

EDIT

From your comment, try this statement to fix the additional \:

UPDATE Meter
SET Name = 'ZAA_' + SUBSTRING(Name, 5, LEN(Name))
WHERE Name LIKE 'ZAA_\%'

Answer 3

Here is the SQLFiddel Demo

Below is the Query which you can try

CREATE TABLE Meter
    ([Name] varchar(7))
;

INSERT INTO Meter
    ([Name])
VALUES
    ('ZAA\001')
;


select * from Meter;

Update Meter
   set Name = stuff(Name,4,1,'_')
 Where SUBSTRING(Name, 1,4) ='ZAA' + Char(92);

select * from Meter;