Why you need to do UNION ? question table is linked to User and you can use it in JOIN
SELECT questions.*,
tags.tagData,
users.username
FROM questions
LEFT JOIN tags
ON tags.questId = questions.id
LEFT JOIN
users ON users.id = questions.ownerId
Question
I know there are more questions about this but I can`t find the right answer for me.
This is my query:
$query = $mysql->query("(
SELECT questions.*, tags.tagData
FROM questions
LEFT JOIN tags
ON questions.id = tags.questId
)
UNION (
SELECT users.username
FROM users
LEFT JOIN questions
ON users.id = questions.ownerId
)
");
I select all the questions in the table questions, also the tags but I save the ownerId as the id of the owner and I want the username to display. Now I get this error:
The used SELECT statements have a different number of columns
What am I doing wrong?
Solution
Why you need to do UNION ? question table is linked to User and you can use it in JOIN
SELECT questions.*,
tags.tagData,
users.username
FROM questions
LEFT JOIN tags
ON tags.questId = questions.id
LEFT JOIN
users ON users.id = questions.ownerId
OTHER TIPS
`SELECT questions.*, tags.tagData
FROM questions
LEFT JOIN tags
ON questions.id = tags.questId
)
UNION (
SELECT users.username,questions.*
FROM users
LEFT JOIN questions
ON users.id = questions.ownerId
)`