Performing Inner Join for Multiple Columns in the Same Table
Performing Inner Join for Multiple Columns in the Same Table
tbColors
color_code , color_name
1 , 'blue'
2 , 'green'
3 , 'yellow'
4 , 'red'
tbAnswers
answer_id , favorite_color , least_favorite_color , color_im_allergic_to
1 , 1 , 2 3
2 , 3 , 1 4
3 , 1 , 1 2
4 , 2 , 3 4
This seems like the way to go:
SELECT
A.answer_id
,C1.color_name AS favorite_color_name
,C2.color_name AS least_favorite_color_name
,C3.color_name AS color_im_allergic_to_name
FROM tbAnswers AS A
INNER JOIN tbColors AS C1
ON A.favorite_color = C1.color_code
INNER JOIN tbColors AS C2
ON A.least_favorite_color = C2.color_code
INNER JOIN tbColors AS C3
ON A.color_im_allergic_to = C3.color_code
cd: Stack Overflow.com
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