5сем / files / sales

DROP FUNCTION IF EXISTS sales;
DELIMITER //
CREATE FUNCTION sales(summa int)
returns VARCHAR(150) DETERMINISTIC
begin
SET @message = 'Процент успешных продаж ';
SET @cikl = (SELECT MAX(id_appeal) FROM my_library.appeals);
SET @count = 0;
WHILE @cikl > 0 DO
SET @total = (SELECT (total) from my_library.appeals where id_appeal = @cikl);
CASE
WHEN @total > summa THEN set @count = @count + 1;
else begin end;
END case;
set @cikl = @cikl -1;
END WHILE;
set @procent = ROUND(@count/(SELECT MAX(id_appeal) FROM my_library.appeals)*100);
SET @message = (select concat(@message , @procent, '%'));
return @message;
end; // select sales(150);