Nested Case statement type error (postgres)

Question

I have some postgres code I have created that is giving me an error:

ERROR:  CASE types character varying and numeric cannot be matched

CODE:

Answer 1

Try eliminating the nested case. Maybe it makes a difference to the compiler for some reason:

CASE
    WHEN b.condition = 'ERROR' AND c.condition2 = 'ERROR' THEN d.condition3
    WHEN b.condition = 'ERROR' THEN c.condition2
    ELSE c.condition
END as current_condition,
...