How to compare two DATE values based only on date part in Oracle?

Question

I am trying to get counts for last 30 days with the following query -

SELECT date_occured, COUNT(*) FROM problem
WHERE date_occured >= (CURRENT_DATE - 30)
GRO         


        

Answer 1

I would tend to suspect that Tony is correct and that you really only want to TRUNC the right-hand side of the expression.

If you do want to TRUNC both sides of the expression and you're encountering performance issues, you probably need a function based index

CREATE INDEX idx_problem_trunc_dt_occured
    ON problem( trunc( date_occurred ) );

That would allow your original query to use the function-based index.