请对此查询提供帮助,这里是 sql fiddler:http ://sqlfiddle.com/#!2/8acc1/1
SELECT DISTINCT c.id, v.sel_category,c.curr_tittle , c.curr_desc, v.videos_desc
FROM wp_curriculum c, wp_career_vidoes v
WHERE c.id IN
(SELECT DISTINCT curr_id
FROM wp_curriculum_category
WHERE curr_category IN (2,3)) AS I
AND I.curr_category = v.sel_category
GROUP BY I.curr_category