10 lines
339 B
MySQL
10 lines
339 B
MySQL
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/*17. Write a query to find all the salesmen who worked for only one customer.*/
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SELECT *
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FROM salesman
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WHERE salesman_id IN (
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SELECT DISTINCT salesman_id
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FROM customer a
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WHERE NOT EXISTS (
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SELECT * FROM customer b
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WHERE a.salesman_id=b.salesman_id
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AND a.cust_name<>b.cust_name));
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