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CREATE TABLE test_data ( Student_Id, Student_Name, Maths, English, History, Physics ) AS SELECT 1, 'ABC', 93, 89, 90, 70 FROM DUAL UNION ALL SELECT 2, 'XYZ', 88, 98, 88, 80 FROM DUAL UNION ALL SELECT 3, 'DEF', 79, 78, 87, 90 FROM DUAL;
3 rows affected
SELECT score FROM test_data UNPIVOT ( score FOR subject IN ( Maths, English, History, Physics ) ) WHERE subject = 'MATHS' AND student_name = 'ABC'
SCORE
93
CREATE FUNCTION getScore( i_student_name IN TEST_DATA.STUDENT_NAME%TYPE, i_subject IN VARCHAR2 ) RETURN NUMBER IS p_score NUMBER(3,0); BEGIN SELECT CASE i_subject WHEN 'MATHS' THEN Maths WHEN 'ENGLISH' THEN English WHEN 'HISTORY' THEN History WHEN 'PHYSICS' THEN Physics END INTO p_score FROM test_data WHERE student_name = i_student_name; RETURN p_score; EXCEPTION WHEN NO_DATA_FOUND THEN RETURN NULL; END; /
SELECT getScore( 'ABC', 'MATHS' ) FROM DUAL;
GETSCORE('ABC','MATHS')
93