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CREATE TABLE allbook( BookName VARCHAR(50), copies INT ); INSERT INTO allbook VALUES ('Book1',5); INSERT INTO allbook VALUES ('Book2',6); INSERT INTO allbook VALUES ('Book3',7); INSERT INTO allbook VALUES ('Book4',8); CREATE TABLE issuedbooks ( Student VARCHAR(50), BookName VARCHAR(50) ); INSERT INTO issuedbooks VALUES ('Ann','Book1'); INSERT INTO issuedbooks VALUES ('Mike','Book1'); INSERT INTO issuedbooks VALUES ('Micheal','Book2'); INSERT INTO issuedbooks VALUES ('John','Book3');
SELECT ab.BookName, ab.copies - coalesce(ib.cnt,0) AvailableCopies FROM allbook ab LEFT JOIN ( SELECT BookName,COUNT(*) cnt FROM issuedbooks GROUP BY BookName ) ib ON ab.BookName = ib.BookName
BookName
AvailableCopies
Book1
3
Book2
5
Book3
6
Book4
8