Question

I need to write a query that finds a single value in multiple columns and then update
those columns where that value exist.

The values that needs to be replaced are in columns that end with _m1

Example table:

o_id   a_m1   a_m2   b_m1   b_m2
1      bb     cc     bb     cc
2      cc     null   bb     cc

I need to find all of the “cc” values in columns that end with _m1 and then update those columns to ‘bb”

Answer 1

UPDATE TABLENAME
  SET a_m1=REPLACE(a_m1,'cc','bb'),
      b_m1=REPLACE(b_m1,'cc','bb')

OR

SELECT a_m1 = CASE WHEN a_m1='cc' THEN 'bb' ELSE a_m1 END,
       b_m1 = CASE WHEN b_m1='cc' THEN 'bb' ELSE b_m1 END

Note:

These do two different things — I’m not sure what you want.

They both only modify a_m1 and b_m1.

In the first every place in the string where cc occurs is replaced with bb

In the second if the value equals exactly cc it is changed to bb otherwise no change.