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How to Set Default Limit in Store Procedure in SQL

This is stored procedure which show you rows return as per mention in stored procedure. CREATE PROCEDURE get_categories( IN p_action_flag VARCHAR(50), IN p_firstrow int, IN p_lastrow int) BEGIN IF p_action_flag = 'all' THEN SELECT top 50 u.*, d.name, d.image FROM user u, member gu, detail d WHERE u.user_id = gu.user_id AND u.user_id = d.user_id AND u.status = '1' AND gu.group_id IN (1, 7) GROUP BY u.user_id ORDER BY d.name LIMIT p_firstrow,p_lastrow; ELSEIF p_action_flag = 'Most Viewed' THEN SELECT top 50 u.*, d.name, d.image FROM user u, member gu, detail d WHERE u.user_id = gu.user_id AND u.user_id = d.user_id AND u.status = '1' AND gu.group_id IN (1, 7) GROUP BY u.user_id ORDER BY u.views DESC, d.name ASC LIMIT p_firstrow,p_lastrow ; END IF END