sql语句学习SELECT * FROM t_pic_OnlinePictureGroupTag a LEFT JOIN t_pic_OnlinePictureTagLib b ON a.o
sql语句学习 SELECT * FROM t_pic_OnlinePictureGroupTag a LEFT JOIN t_pic_OnlinePictureTagLib b ON a.onlinepicturetaglibid=b.tid LEFT JOIN t_pic_OnlinePictureGroup c ON a.onlinepicturegroupid=c.id WHERE CODE IN ('a1','b1')
