Question

Hi hope someone can advise

I have a sql query that went it runs it repeats the same result by the number of users (entries) made

for example:

post_id
20
20
19
19
18
18

Here is the query it takes no arguments, could someone explain why this is happening please?

Thanks

SELECT DISTINCT post_look.post_id, post_look.look_id, post_look.date_posted,     looks.title, looks.item_id, user.user_id, user.first_name, user.last_name,    user_account.profile_image, user_account.account_status, add_profile_images.image_name
FROM post_look
JOIN looks ON looks.look_id = post_look.look_id
JOIN add_look_item ON add_look_item.look_id = looks.look_id
JOIN item ON item.item_id = add_look_item.item_id
JOIN add_images ON add_images.item_id = item.item_id
JOIN user_item ON user_item.item_id = item.item_id
JOIN user_account ON user_account.account_id = user_item.account_id
JOIN user ON user.user_id = user_account.user_id
JOIN users_profile_images ON users_profile_images.account_id = user_account.account_id
JOIN add_profile_images ON add_profile_images.image_id = users_profile_images.image_id
ORDER BY post_look.post_id DESC 
LIMIT 0 , 30

Answer 1

SELECT DISTINCT c1, c2, c3

means that {c1, c2, c3} will be distinct.

You should consider adding GROUP BY post_look.post_id to your query.

See the difference here:

• DISTINCT
• GROUP BY