如何在Postgresql中将变量传递给date_part函数？

Question

I'm passing a variable from my function into the date_part function but I keep getting a syntax error. Tried these 2 examples below and still got a syntax error.

Example 1:

_month = date_part('month', timestamp NEW."sdate");

Example 2:

_month = date_part('month', timestamp format('%s',NEW."sdate"));

Can anyone tell me how do I pass my variable into this function?

Answer 1

I think there is no need to use timestamp literal or format the string if you need to pass it to date_part function. If sdate is of type DATE , you may use it directly.

date_part('month',NEW."sdate");

If sdate is a proper date string such as '2018-01-26 13:15:20', then your first example should work fine - date_part('month', timestamp NEW."sdate");