SQL查询返回的列的值大于某个最小值（取决于类别）的行？

Question

If I have for example these 2 tables:

table1:

item       category     rating
------     --------     ------
table      furniture      6
chair      furniture      5
sofa       furniture      7
bed        furniture      4
apple      food           7
banana     food           6
spinach    food           9
almonds    food           8
happiness  feeling        7
compassion feeling        6
love       feeling        8
admiration feeling        7

and table2:

category     minimum_rating
--------     --------------
furniture          6 
food               8
feeling            7

and taking into consideration that the value minimum_rating for each category would be revised each month, so it would change... How would I query table1 in relation to table2 so that it would take the value of minimum_rating for that category of the item and return only those items in table1 with a rating equal or above the minimum rating? In this case the query would be expected to return:

item       category     rating
------     --------     ------
table      furniture      6
sofa       furniture      7
spinach    food           9
almonds    food           8
happiness  feeling        7
love       feeling        8
admiration feeling        7

Thanks a lot for your knowleadgeable input!

Answer 1

I think you need a JOIN on both the table like below. You can probably as well say t1.rating = t2.minimum_rating

select t1.*
from table1 t1 join table2 t2 on t1.category = t2.category
where t1.rating >= t2.minimum_rating;

Answer 2

A simple join should do the job:

Select a.* from table1 as a
 inner join table2 as b on a.furniture = b.furniture and a.rating >=     b.minimum_rating;