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2013-12-03T08:49:42.170
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I've wrapped the SQL into a function to make it easier to show some tests: <a href="http://sqlfiddle.com/#!4/4c679/5" rel="nofollow">SQL Fiddle</a> Oracle 11g R2 Schema Setup: <pre><code>CREATE TABLE mstuser ( id, gender, dob ) AS SELECT 1, 'M', SYSDATE - INTERVAL '1' YEAR FROM DUAL UNION ALL SELECT 2, 'M', SYSDATE - INTERVAL '2' YEAR FROM DUAL UNION ALL SELECT 3, 'M', SYSDATE - INTERVAL '3' YEAR FROM DUAL UNION ALL SELECT 4, 'F', SYSDATE - INTERVAL '1' YEAR FROM DUAL UNION ALL SELECT 5, 'F', SYSDATE - INTERVAL '2' YEAR FROM DUAL UNION ALL SELECT 6, 'F', SYSDATE - INTERVAL '3' YEAR FROM DUAL UNION ALL SELECT 7, 'F', SYSDATE - INTERVAL '4' YEAR FROM DUAL UNION ALL SELECT 8, 'F', SYSDATE - INTERVAL '5' YEAR FROM DUAL / CREATE OR REPLACE FUNCTION count_by_compare ( gender_compare mstuser.gender%TYPE, age_compare_group VARCHAR2 ) RETURN NUMBER AS user_count NUMBER; BEGIN SELECT COUNT(1) INTO user_count FROM mstuser a WHERE ( gender_compare IS NULL OR UPPER( a.gender ) = UPPER(gender_compare) ) AND ( age_compare_group IS NULL OR MONTHS_BETWEEN(sysdate, a.dob) / 12 BETWEEN TO_NUMBER( SUBSTR(age_compare_group, 1, INSTR(age_compare_group, '-') - 1) ) AND TO_NUMBER( SUBSTR(age_compare_group, INSTR(age_compare_group, '-') + 1) ) ); return user_count; END; / </code></pre> Query 1: <pre><code>WITH Tests AS ( SELECT 'M' AS gender, '0-1' AS age FROM DUAL UNION ALL SELECT 'F', '0-6' FROM DUAL UNION ALL SELECT 'F', '0-1' FROM DUAL UNION ALL SELECT 'M', '0-6' FROM DUAL UNION ALL SELECT NULL, '0-2' FROM DUAL UNION ALL SELECT 'M', NULL FROM DUAL UNION ALL SELECT 'F', NULL FROM DUAL UNION ALL SELECT NULL, NULL FROM DUAL UNION ALL SELECT '', '' FROM DUAL ) SELECT gender, age, SUBSTR(age, 1, INSTR(age, '-') - 1), SUBSTR(age, INSTR(age, '-') + 1), count_by_compare( gender, age ) FROM Tests </code></pre> <a href="http://sqlfiddle.com/#!4/4c679/5/0" rel="nofollow">Results</a>: <pre><code>| GENDER | AGE | SUBSTR(AGE,1,INSTR(AGE,'-')-1) | SUBSTR(AGE,INSTR(AGE,'-')+1) | COUNT_BY_COMPARE(GENDER,AGE) | |--------|--------|--------------------------------|------------------------------|------------------------------| | M | 0-1 | 0 | 1 | 1 | | F | 0-6 | 0 | 6 | 5 | | F | 0-1 | 0 | 1 | 1 | | M | 0-6 | 0 | 6 | 3 | | (null) | 0-2 | 0 | 2 | 4 | | M | (null) | (null) | (null) | 3 | | F | (null) | (null) | (null) | 5 | | (null) | (null) | (null) | (null) | 8 | | (null) | (null) | (null) | (null) | 8 | </code></pre> Also, you don't need to test for <code>!= ''</code> as oracle represents an empty string as a <code>NULL</code> - see the final test above or the empty string comparisons below: <pre><code>SELECT CASE WHEN '' = '' THEN 1 ELSE 0 END AS equal, CASE WHEN '' != '' THEN 1 ELSE 0 END AS not_equal, CASE WHEN '' IS NULL THEN 1 ELSE 0 END AS is_null, CASE WHEN '' IS NOT NULL THEN 1 ELSE 0 END AS is_not_null FROM DUAL </code></pre> Gives the result: <pre><code>| EQUAL | NOT_EQUAL | IS_NULL | IS_NOT_NULL | |-------|-----------|---------|-------------| | 0 | 0 | 1 | 0 | </code></pre>
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1. COThanks for the such a good answer with good and clean explanation.
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