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Developer-C 11.1
3.0
4.0
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8.4
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10
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3.27
3.39
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CREATE TABLE data (day int NOT NULL, some_data int);
CREATE TABLE table_of_days (day int NOT NULL);
INSERT INTO data (day) VALUES (1) , (2) , (2) , (2) , (5) , (5) ;
INSERT INTO table_of_days (day) VALUES (1) , (2) , (3) , (4) , (5) ;
SELECT tod.day , COUNT(*) , COUNT(d.day) FROM table_of_days AS tod LEFT JOIN data AS d USING (day) GROUP BY tod.day ;
day
COUNT(*)
COUNT(d.day)
1
1
1
2
3
3
3
1
0
4
1
0
5
2
2