UPDATE and REPLACE part of a string

Question

I\'ve got a table with two columns, ID and Value. I want to change a part of some strings in the second column.

Example of Table:

Answer 1

To make the query run faster in big tables where not every line needs to be updated, you can also choose to only update rows that will be modified:

UPDATE dbo.xxx
SET Value = REPLACE(Value, '123', '')
WHERE ID <= 4
AND Value LIKE '%123%'