mysql聯表查詢 使用別名進行where比較

select gd_reg.*, tbl_menu_sub.menunames as gdnames FROM  (SELECT substring_index(gd_reg.gdname,',', -1) as gdnamedemo, gd_reg.* FROM gd_reg)  gd_reg,tbl_menu_sub WHERE gdnamedemo = tbl_menu_sub.id ORD

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