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Developer-C 11.1
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CREATE TABLE T1( Company VARCHAR(20), Users VARCHAR(20) ); CREATE TABLE T2( Users VARCHAR(20) ); INSERT INTO T1 VALUES ('c1', 'u1'), ('c1', 'u2'), ('c2', 'u2'), ('c2', 'u3'), ('c3', 'u4'), ('c3', 'u1'); INSERT INTO T2 VALUES ('u2'), ('u3');
8 rows affected
SELECT T1.Company, SUM(CASE WHEN T2.Users IS NULL THEN 0 ELSE 1 END) Cnt FROM T1 LEFT JOIN T2 ON T1.Users = T2.Users GROUP BY T1.Company
Company
Cnt
c1
1
c2
2
c3
0