Question

I have two tables which i would like to turn into one in a SELECT query by merging some columns together while having other columns remaining distinct.

first table (posts_article)

 id_post   id_user   title   content   published   nbr_comments   timestamp
 ---------------------------------------------------------------------------
 1         15        title1  text1     1           23             1111111111
 2         20        title2  text2     0           54             1122334455

second table (posts_text)

 id_post   id_user   message   nbr_comments   timestamp
 -------------------------------------------------------
 1         17        message1  15             1234567891
 2         22        message2  0              1987654321

expected result

 id_post   id_user   title   content   message    published   nbr_comments   timestamp
 --------------------------------------------------------------------------------------
 1         15        title1  text1                1           23             1111111111
 2         20        title2  text2                0           54             1122334455
 1         17                          message1               15             1234567891
 2         22                          message2               0              1987654321

I’ve tried a few things but i can’t really solve this. how can I get the expected result? What is the most efficient way to select that result?

EDIT: The logic of this merge is to be able to get all the different types of “posts” (submitted by users) at the same time.

Thanks.

Answer 1

Try:

SELECT id_post, id_user,  title,  content, NULL AS message , published, nbr_comments, timestamp FROM posts_article
UNION
SELECT id_post, id_user, NULL as title, NULL as content,  message, NULL as published, nbr_comments, timestamp FROM posts_text