Is it possible to have a placeholder on the left side of a select
criteria?

eg:

SELECT CASE WHEN date_part('dow',?::date)=5 

this bit is fine

THEN CASE WHEN ? = 2 OR ? =3 OR ?=6 OR ?=7 OR ?=8 OR ?=12 THEN '7:00' 

here the ? is being read as NULL ie, output from LOG

SELECT CASE WHEN date_part('dow', '2005-02-28'::date)=5 THEN CASE WHEN
NULL = 2 OR  NULL =3 OR  NULL=6 OR  NULL=7 OR  NULL=8 OR  NULL=12 THEN
'7:00' WHEN  NULL = 1 OR  NULL =5 OR  NULL=13 THEN '3:30' ELSE  NULL
END 

I am getting the ? translated as nulls

apologies for off-topic, but any help appreciated

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