Question

select tbl_c_food_veg.pk_veg_id,tbl_c_food_veg.var_desc,tbl_c_food_veg.var_title ,tbl_c_food_veg_img.var_img,( select tbl_c_food_non_veg.pk_non_veg_id,tbl_c_food_non_veg.var_desc,tbl_c_food_non_veg.var_title,tbl_c_food_non_veg_img.var_img from tbl_c_food_non_veg left join tbl_c_food_non_veg_img on tbl_c_food_non_veg.pk_non_veg_id=tbl_c_food_non_veg_img.fk_non_veg_id where 

tbl_c_food_non_veg.fk_cat_id=8 and tbl_c_food_non_veg.pk_non_veg_id!=0  group by tbl_c_food_non_veg_img.fk_non_veg_id  order by tbl_c_food_non_veg.pk_non_veg_id desc limit 2 ) as non_veg,( select tbl_c_food_drinks.pk_drinks_id, tbl_c_food_drinks.var_desc, tbl_c_food_drinks.var_title, tbl_c_food_drinks_img.var_img from tbl_c_food_drinks left join tbl_c_food_drinks_img on tbl_c_food_drinks.pk_drinks_id=tbl_c_food_drinks_img .fk_drinks_id where 

tbl_c_food_drinks.fk_cat_id=8 and tbl_c_food_drinks.pk_drinks_id!=0  group by tbl_c_food_drinks_img.fk_drinks_id  order by tbl_c_food_drinks.pk_drinks_id desc limit 2 ) as drinks from  tbl_c_food_veg left join tbl_c_food_veg_img on tbl_c_food_veg.pk_veg_id=tbl_c_food_veg_img.fk_veg_id where 

tbl_c_food_veg.fk_cat_id=8 and tbl_c_food_veg.pk_veg_id!=0  group by tbl_c_food_veg_img.fk_veg_id  order by tbl_c_food_veg.pk_veg_id desc limit 2

Answer 1

在用于检索non_veg和drink的嵌套子查询中，您使用限制2，因此子查询很可能会返回2行，但您只能使用一行。将限制更改为limit 1

并尝试使用别名，因为Barranka说它会更容易阅读您的查询

我正在尝试这个QUERY，并返回这个奇怪的错误，请帮助我

1 个答案: