ERROR: operator does not exist: character varying = boolean - sql

Question

I have the following query:
SELECT
CASE
tbl_appointment_types."name"
WHEN tbl_appointment_types."name" LIKE 'Refill-ART' THEN
'Re-Fill'
WHEN tbl_appointment_types."name" = 'Enhanced Adherence'::character varying THEN
'Enhanced Adherence'
WHEN tbl_appointment_types."name" = 'PHARMACY APPOINTMENT'::character varying THEN
'Re-Fill' ELSE tbl_appointment_types."name"
END
FROM
tbl_appointment INNER JOIN tbl_appointment_types ON tbl_appointment_types."id" = tbl_appointment.app_type_1
GROUP BY
tbl_appointment_types."name";
When I try running it, I get the following error:
> ERROR: operator does not exist: character varying = boolean
LINE 4: WHEN tbl_appointment_types."name" LIKE 'Refill-ART' THEN
^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts.
> Time: 0.054s
How can I solve the following issue?

Answer 1

The CASE expression comes in two flavors:
A "short" form that only supports equality where you first state the expression and then the values to which that should be compared (using =), e.g.
CASE some_column
WHEN 1 THEN 'One'
WHEN 2 THEN 'Two'
ELSE 'Something else'
END
Or a more verbose version where you can use different condition for each WHEN. But in that case you can not have the expression after the CASE:
CASE -- nothing here!
WHEN some_column = 1 THEN 'One'
WHEN some_column = 2 THEN 'Two'
ELSE 'Something else'
END
So you need to write your CASE expression as:
CASE -- nothing here!
WHEN tbl_appointment_types."name" LIKE 'Refill-ART' THEN 'Re-Fill'
WHEN tbl_appointment_types."name" = 'Enhanced Adherence' THEN 'Enhanced Adherence'
WHEN tbl_appointment_types."name" = 'PHARMACY APPOINTMENT' THEN 'Re-Fill'
ELSE tbl_appointment_types."name"
END
Using LIKE without a wildcard doesn't really makes sense. "name" LIKE 'Refill-ART' is the same as "name" = 'Refill-ART'.
You probably meant "name" LIKE 'Refill-ART%' (note the % at the end)