与SQL Server的If Exists等效的Postgres（

Question

I have a T-SQL query I would like to be able to use in Postgres. I'm new to Postgres and would like to know if the If Exists is possible as well as the Print or what the equivalents would be.

Basically it is just checking to see if there is any info in a table and if there is then it calls a stored procedure, if not it posts nothing to report in the logs, that part isn't really needed but I would like to know the print if possible.

IF Exists(Select * from [mytable]
Having Count(*) > 0)

EXEC sp_someprocedure
ELSE
PRINT 'Table Empty: Nothing to report.'

Answer 1

Sure does, for example:

do $$begin
if exists (select * from yourtable) then
    perform your_function();
else
    raise notice 'nothing to report';
end if;
end$$;