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WITH score_table AS ( SELECT '1900-01-01' AS Date1, '1940-01-01' AS Date2, 15 AS Value UNION ALL SELECT '1940-01-01', '1950-01-01', 25 UNION ALL SELECT '1950-01-01', NULL, 30 ), participant_table AS ( SELECT '1930-05-05' AS BirthDate, 'M' AS Gender UNION ALL SELECT '1954-07-02', 'V' UNION ALL SELECT '1941-11-01', 'U' ) SELECT p.BirthDate, p.Gender, s.Value AS Score FROM participant_table p INNER JOIN score_table s ON (p.BirthDate >= s.Date1 OR s.Date1 IS NULL) AND (p.BirthDate < s.Date2 OR s.Date2 IS NULL);
BirthDate
Gender
Score
1930-05-05
M
15
1954-07-02
V
30
1941-11-01
U
25