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DELIMITER //
CREATE FUNCTION iskakislam.get_name_glasses (PID INT)
RETURNS VARCHAR(80) character set utf8
BEGIN
DECLARE NAME_FOUNT TEXT DEFAULT "";
SELECT NAME_GLASSES INTO NAME_FOUND FROM iskakislam.glasses WHERE ID=PID;
RETURN NAME_FOUND;
END //
DELIMITER ;

SELECT iskakislam.get_name_glasses(1);

Error Code: 1327. Undeclared variable: NAME_FOUND 0.000 sec