IN statement multiple columns

Question

I want to implement the below query

Select * from table1
where a in(select a,b,c,d,e from table2 order by date desc limit 5)

But IN statement is allowing only 1 column.

Answer 1

The fact that you need to do this suggests your design could use a rethink. But assuming the goal is to compare "a" from table1 separately to each column's value for table2, you can do it like this:

 ... in (select unnest(array[a,b,c,d,e]) from (select * from table2 order by date limit 5) foo )

Answer 2

You can use the where clause in following

Select * from table1
where (a,a,a,a,a) in(select a,b,c,d,e from table2 order by date desc limit 5)