Question

I need to update a MYSQL Table

Here is a very simple look at Table_A

ID  VALUE  RESULT
1   4      0
2   2      0
3   7      0

I want to update the RESULT Column based on conditions

So my query statement needs to look something like

UPDATE Tabel_A
SET RESULT = (if some condition) 1
             OR (if another condition) 2
             OR (if a different condition) 3

Or should I use something like

UPDATE Tabel_A
SET RESULT = (CASE 1) 1
             (CASE 2) 2
             (CASE 3) 3

I am not sure how to structure the query

Thanks

Answer 1

I’ll prefer to use CASE here.

UPDATE TAble1
SET Result = CASE value
                WHEN 1 THEN x
                WHEN 2 THEN y
                ....
                ELSE z
            END

or

UPDATE TAble1
SET Result = CASE 
                WHEN value = 1 THEN x
                WHEN value = 2 THEN y
                ....
                ELSE z
            END