MySQL manually add id in clause "WHERE IN (SELECT ...)" -


i have query:

select * t1 child_id in (select child_id t2 parent_id='1234') or parent_id='1234'

is possible this:

select * t1 child_id in (     (select child_id t2 parent_id='1234')     union '5678' )

the union keyword gives error message , tried searching on google it's hard find when search "mysql concat in"

i hope question clear

yes, this:

select * t1 child_id in  (   select child_id t2 parent_id='1234'   union     select 5678 )

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