I currently have 6 very similar queries that I’m trying to increase performance on by making them all subqueries in 1 query. I’m not sure what is better performance wise, keeping them 6 separate queries, 1 query with 6 subqueries (as shown below), or some other method that I’m unfamiliar with.
SELECT (SELECT COUNT(*) FROM table_one WHERE date=myDate AND name=myName) AS total, (SELECT COUNT(*) FROM table_one WHERE date=myDate AND name=myName AND CODE_A BETWEEN 100 AND 199) AS code_a_low_count, (SELECT COUNT(*) FROM table_one WHERE date=myDate AND name=myName AND CODE_A BETWEEN 200 AND 299) AS code_a_high_count, (SELECT COUNT(*) FROM table_one WHERE date=myDate AND name=myName AND CODE_B BETWEEN 100 AND 199) AS code_b_low_count, (SELECT COUNT(*) FROM table_one WHERE date=myDate AND name=myName AND CODE_B BETWEEN 200 AND 299) AS code_b_high_count, (SELECT COUNT(*) FROM table_one WHERE date=myDate AND name=myName AND CODE_C BETWEEN 100 AND 199) AS code_c_count FROM table_one WHERE ROWNUM=1
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