显示重复记录的MySQL游标存储过程条件

DELIMITER //

CREATE PROCEDURE show_duplicate_records()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE col1_value VARCHAR(255);
    DECLARE cur CURSOR FOR SELECT col1 FROM your_table ORDER BY col1;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;

    SET @prev_value = NULL;

    read_loop: LOOP
        FETCH cur INTO col1_value;
        IF done THEN
            LEAVE read_loop;
        END IF;

        IF col1_value = @prev_value THEN
            -- 显示重复记录的处理逻辑
            SELECT col1_value;
        END IF;

        SET @prev_value = col1_value;
    END LOOP;

    CLOSE cur;
END //

DELIMITER ;