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I have a table in my DB questionnaire_self that contains the answers of a survey.
Each item of this table has a foreign key user_id referred to id in the table user
What is the query to filter the users (from table user) who do not answer a survey yet, i.e., their id's are not in questionnaire_self.
Thanks.
select * from user where id not in (select user_id from questionnaire_self)
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So I have a table for biddings, you can win the bidding by posting the lowest unique bid. So if 2 people place a bet of $1, none of them win, if 1 person places a bet of $2, this guy wins. But how can I check this in MySQL?
Assume your table has the bid value stored in the field name bet, then below is a worked solution:
SELECT * FROM YourTableName
WHERE bet = (SELECT MIN(bet) FROM YourTableName)
GROUP BY bet
HAVING COUNT(*) = 1;
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I have one table with 3 fields e.g.
Name, Team Name, Player_Number
there is multiple team and I want to fetch 2 member from each team.
Please share with fast solution.
Try this
select * from TableName s where (select count(*) from TableName a where a.TeamName = s.TeamName and a.Player_Number >= s.Player_Number) <= 2
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I have a question about MySQL: I want to list results from a table but gather additional information about these results from another table by a foreign key.
My table YTPrograms has a foreign key called Author which corresponds to the Id of a second table called YTUsers from which I want to add the username to my result from the YTPrograms query. I'm not sure how to do this without having to query (the users table) for each result.
Try this:
SELECT p.something, u.username FROM YTPrograms p, YTUsers u WHERE p.Author = u.Id
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How can I do this correctly?
INSERT INTO tbl_task (`Assignedby`,`userID`)
SELECT ID FROM tbl_users WHERE UserName='$_GET[u]',
SELECT ID FROM tbl_users WHERE UserName='$_GET[at]'
Assuming you want to insert one row with two columns, I think you might want this:
INSERT INTO tbl_task(`Assignedby`, `userID`)
SELECT (SELECT ID FROM tbl_users WHERE UserName='$_GET[u]'),
(SELECT ID FROM tbl_users WHERE UserName='$_GET[at]');
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I have three tables:
user (user_id)
question (question_id)
answer (question_id, answer_id, user_id)
How can I select the questions that a user didn't answer?
Thank you.
You question appears to be missing some information as user is not associated with question or answer in any way. Assuming that answer has (user_id, question_id, answer_id) or that answer only has answered questions in it you can do
SELECT question_id
FROM question q
WHERE NOT EXISTS(SELECT * FROM answer a WHERE a.question_id = q.question_id);