StackOverflow2013

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plurals

PO
primarykey
Id
19054695
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2013-09-27T15:34:44.643
FavoriteCount
0
LastActivityDate
2013-09-27T15:34:44.643
LastEditDate
2017-05-23T12:03:25.257
LastEditorUserId
-1
OwnerUserId
2573622
ParentId
19054133
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
text
Body
<p>You cannot do this through a query by and of itself.</p> <p>Look here for some example code: <a href="https://stackoverflow.com/questions/19021631/how-to-merge-data-from-2-tables-with-mysql/19022843#19022843">How to merge data from 2 tables with MySQL</a></p> <p>What you can do is use an <code>INNER JOIN</code> or <code>GROUP_CONCAT</code> and then reformat the data in your script (whether that be <code>php</code> or another language)</p> <h3>Using JOIN</h3> <p><em>Unser the circumstances this would likely lead to a large excess/irrelevant data in each row</em></p> <pre><code>SELECT c.*, csa.answer FROM customers c INNER JOIN customer_survey_answer csa ON csa.`customer_id`=c.`customer_id` ORDER BY c.customer_id, csa.customer_survey_question_id </code></pre> <h3>Using GROUP_CONCAT</h3> <p><em>This will output one cell (csv style) as the answers</em></p> <pre><code>SELECT c.*, GROUP_CONCAT(csa.answer) as answers FROM customers c INNER JOIN customer_survey_answer csa ON csa.`customer_id`=c.`customer_id` GROUP BY c.customer_id </code></pre> <h2>Using a loop</h2> <p>You might also consider querying the database for a list of customers with answers and then running a second query (for each customer returned) to get their answer. <em>This could lead to a large number of queries.</em></p> <p>First query:</p> <pre><code>SELECT * FROM customers </code></pre> <p>Second query:</p> <pre><code>SELECT answer FROM customer_survey_answer WHERE customer_id = INSERT_CUSTOMER_ID_HERE} </code></pre>
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PostParentId
1. POMultiple columns in one subquery
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1. USCommunity
UserOwnerUserId
1. USSteven
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1. COThank you very much!
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  USandy
2. CONo problem, glad it worked out :)
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