Re: Like Command returning wrong result set

> On Aug 5, 2021, at 07:00, Tchouante, Merlin <mtchouan(at)umaryland(dot)edu> wrote:
>
> Hello group,
>
> I’m writing a script and a bit confused on the results with the like command.
>
> gm.title like 'CP_%'
>
> The above command gives me records with titles like CP_40, CP_2, CP_23, etc.
>
> gm.title like '%_CT'

Somewhat confusingly, '_' is the single-character wildcard for SQL's LIKE operation:

xof=# SELECT 'A' LIKE '_';
?column?
----------
t
(1 row)

You can escape it to search for it literally:

xof=# SELECT '_' LIKE '\_';
?column?
----------
t
(1 row)

xof=# SELECT 'A' LIKE '\_';
?column?
----------
f
(1 row)