SELECT FIND_IN_SET('y','x,y,z'); -- 2
SELECT FIND_IN_SET('a','x,y,z');
SELECT FIND_IN_SET('a','');
SELECT FIND_IN_SET(NULL,'x,y,z');
SELECT FIND_IN_SET('a',NULL);
SELECT * FROM customers;
SELECT * FROM employees;
SELECT * FROM offices;
SELECT * FROM orderdetails;
SELECT * FROM orders;
SELECT * FROM payments;
SELECT * FROM productlines;
SELECT * FROM products;