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I try to convert double precision return value(31) but it does not work? Normally, select cast(31 as int); or select cast(31.0 as int); How i can solve it? My code below:

  select cast(select num_days(2019,1) as int);
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  • An extra pair of parentheses would do the trick: select cast((select num_days(2019,1)) as int);. But the answer shows the better way. Commented Feb 8, 2019 at 8:04

1 Answer 1

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You need to cast the expression (the function call), not the SELECT statement:

select cast(num_days(2019,1) as int);

or simply:

select num_days(2019,1)::int;
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