Question

I need to select a row only from two corresponding tables, for instance,

member table,

member_id   member_name
1           xxx
2           yyy

profile_picture table

image_id   member_id   image_approved
1          1           no
2          1           no
3          1           yes

I want to select one row from member table each time and one approved image from profile_picture. I am using left join but it doesn’t work right as it duplicates the selected member when this member has more than 1 uploaded images. the tricky part is I want to select the image which has been approved only and it is always one picture will be approved.

SELECT *
    FROM member 

    LEFT JOIN profile_picture 
    ON profile_picture.member_id = member.member_id

    WHERE member.member_id = '1'

I would like to get this as a output,

member_id   member_name image_id image_approved
1           xxx         3        yes

is it possible?

thanks.

edit:

thanks guys for the suggestions. many of you have suggested using AND – for instance, AND profile_picture.image_approved = ‘yes’

it works only when the image is present. but if the image is absent, there is nothing in the output even though it should output like this below if the image is absent.

member_id   member_name image_id image_approved
1           xxx         null      null

thanks again!

Answer 1

select
  *
from
  member m
  left join profile_picture p on p.member_id = m.member_id
where
  m.member_id = '1'
  and (p.image_approved is null or p.image_approved = 'yes')

image_approved isn’t part of the join condition, so I don’t put that in the join clause. It’s rather part of the row selection condition, so it goes in where. Thinking about what you want, you either want nothing in profile_picture, or the approved row. So, conditions.