Alternative for EXISTS for this problem

Hello

create the table test_pa
(number of emp_id,
run_date date,
Number value,
Run_type varchar (1)
);

insert into test_pa values (1, trunc (sysdate), 500,' a);
insert into test_pa values (1, trunc (sysdate), 400,' a);
insert into test_pa values (1, trunc (sysdate), 300,' it);

insert into test_pa values (2, trunc (sysdate), 500,' a);
insert into test_pa values (2, trunc (sysdate), 400,' a);
insert into test_pa values (2, trunc (sysdate), 300,' a);

insert into test_pa values (3, trunc (sysdate), 500,' it);
insert into test_pa values (3, trunc (sysdate), 400,' it);
insert into test_pa values (3, trunc (sysdate), 300,' a);

commit;

Now, I want to display all the records for these employees on a special day in which the employee had a performance of 'C '. So in this example, I want the release of records for emp id 1 and 2.

The query I use is

Select * from test_pa a

where exists (select 1 from test_pa b where a.emp_id = b.emp_id and a.run_date = b.run_date and b.run_type = "C");

This works as expected. However, this is a test table and the original table on which I want to apply this million lines. My question is if there is a better alternative EXISTS to improve performance. This query takes a long time to run on the original table.

Thank you

Hello

So, to decide if a line should be included or not, you need to look at other lines.

An EXISTS subquery is a way: to do.

Analytical functions, IN questioning him and other ways self-joins.

Here's how you can use the analytic function MAX:

WITH got_ok_flag AS

(

SELECT emp_id, run_date, value, run_type

MAX (CASE

WHEN run_type = 'C '.

THEN 1

END

) OVER (PARTITION BY emp_id) AS ok_flag

OF test_pa

-WHERE... - If you need any filtering, put it here

)

SELECT emp_id, run_date, value, run_type

OF got_ok_flag

WHERE ok_flag = 1

ORDER BY emp_id

;

Dependning on what you mean by "on a special day", you need to maybe add a WHERE clause, or change the PARTITION BY clause analytical.

Tags: Database

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