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Developer-C 11.1
3.0
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CREATE tABLe nation(id int, c_name varchar(20))
INSERT INTO nation VALUEs (1,'AFRICA'),(2,'UNITED STATES')
CREATE TABLE orders (id int,nation_id int)
INSERT INTO orders VALUES(1,1),(2,1),(3,2),(4,2),(5,2)
SELECT SUM(count_) FROM (SELECT COUNT(*) count_, 'UNITED SATES' FROM orders INNER JOIN nation ON orders.nation_id = nation.id WHERE c_name = 'UNITED STATES' UNION SELECT COUNT(*) , 'AFRIKA' FROM orders INNER JOIN nation ON orders.nation_id = nation.id WHERE c_name = 'AFRICA') Result
SUM(count_)
5
SELECT SUM(count_) FROM (SELECT COUNT(*) count_ FROM orders INNER JOIN nation ON orders.nation_id = nation.id WHERE c_name = 'UNITED STATES' UNION ALL SELECT COUNT(*) FROM orders INNER JOIN nation ON orders.nation_id = nation.id WHERE c_name = 'AFRICA') Result
SUM(count_)
5