StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POSELECT something JOIN ON something IN columns of multiple tables
primarykey
Id
7225838
data
AcceptedAnswerId
7225927
AnswerCount
1
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2011-08-29T03:39:32.153
FavoriteCount
1
LastActivityDate
2011-08-29T04:01:00.393
LastEditDate
LastEditorUserId
0
OwnerUserId
855586
ParentId
0
PostTypeId
1
Score
2
ViewCount
174
LastEditorDisplayName
text
Body
I'm trying to integrate a bunch of SELECTs all into one. I have multiple tables that look similar to the following: Table: A1 <pre><code>+---+----+----+----+----+ |id | I1 | I2 | I3 | I4 | +---+----+----+----+----+ | 1 | 5 | 6 | 1 | 3 | +---+----+----+----+----+ </code></pre> Table: A2 <pre><code>+---+----+----+----+ |id | I1 | I2 | I3 | +---+----+----+----+ | 1 | 3 | 10 | 5 | +---+----+----+----+ </code></pre> And 1 table that looks like this: Table: Standards <pre><code>+---+---------+ |id | Name | +---+---------+ | 1 | 'one' | | 2 | 'two' | | 3 | 'three' | | 4 | 'four' | | 5 | 'five' | | 6 | 'six' | | 7 | 'seven' | | 8 | 'eight' | | 9 | 'nine' | |10 | 'ten' | +---+---------+ </code></pre> PHP Code <pre><code><?php while(/*"A" tables*/){ $noi = // number of columns in this A table $id = // id of this A table $columns = ""; for ($i=1; $i<=$noi; $i++){ $columns = $columns . "A" . $id . ".I" . $i . ", "; } $columns = rtrim($columns, ", "); $sql = "SELECT s.* FROM A" . $id . " INNER JOIN Standards AS s ON s.id IN (" . $columns . ") WHERE A" . $id . ".id=1 ORDER BY s.id ASC"; $result = mysql_query($sql); } ?> </code></pre> I'd like to combine all of these SELECTS into 1. I was thinking I could run a for loop to generate all the names of the tables, but I wasn't sure exactly how to join them with the other JOIN ON ... IN (...) that's in there. The results I want to generate are: <pre><code>+---+---------+ |id | Name | +---+---------+ | 1 | 'one' | | 3 | 'three' | | 5 | 'five' | | 6 | 'six' | |10 | 'ten' | +---+---------+ </code></pre>
Tags
<php><mysql><sql>
Title
SELECT something JOIN ON something IN columns of multiple tables
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USabarrington
plurals
PostLinksPostIdRelatedPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
2. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POSELECT something JOIN ON something IN columns of multiple tables
 UserUserId
 USAndreas
 VoteTypeVoteTypeId
 VTFavorite
2. VO
 singulars
 PostPostId
 POSELECT something JOIN ON something IN columns of multiple tables
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 POSELECT something JOIN ON something IN columns of multiple tables
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.