将子查询转化成连表查询有关问题
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2022-04-30 10:49:46
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将子查询转化成连表查询问题
SELECT * FROM (SELECT a.video_name NAME,a.vid,a.pos,a.pic,a.definition,b.app_code,a.strength,a.ad_mark FROM access_app_video a
LEFT JOIN access_app b ON a.app_id=b.id WHERE tag_interest=2 AND app_id=1 AND a.ad_mark=1 AND a.status=0 ORDER BY ABS(tag_sex-16),ABS(tag_figure-10)) aa
ORDER BY aa.strength DESC LIMIT 0,12
该子查询如何改为连表查询
------解决思路----------------------
SELECT * FROM (SELECT a.video_name NAME,a.vid,a.pos,a.pic,a.definition,b.app_code,a.strength,a.ad_mark FROM access_app_video a
LEFT JOIN access_app b ON a.app_id=b.id WHERE tag_interest=2 AND app_id=1 AND a.ad_mark=1 AND a.status=0 ORDER BY ABS(tag_sex-16),ABS(tag_figure-10)) aa
ORDER BY aa.strength DESC LIMIT 0,12
该子查询如何改为连表查询
------解决思路----------------------
SELECT a.video_name NAME,a.vid,a.pos,a.pic,a.definition,b.app_code,a.strength,a.ad_mark
FROM access_app_video a LEFT JOIN access_app b ON a.app_id=b.id
WHERE tag_interest=2 AND app_id=1 AND a.ad_mark=1 AND a.status=0
ORDER BY a.strength, ABS(tag_sex-16),ABS(tag_figure-10) DESC
LIMIT 0,12
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