StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POJoin table to get the latest rows from unique row
primarykey
Id
13759280
data
AcceptedAnswerId
13759506
AnswerCount
2
ClosedDate
CommentCount
5
CommunityOwnedDate
CreationDate
2012-12-07T08:13:27.127
FavoriteCount
0
LastActivityDate
2012-12-07T08:46:28.093
LastEditDate
2017-05-23T10:28:40.620
LastEditorUserId
-1
OwnerUserId
507203
ParentId
0
PostTypeId
1
Score
0
ViewCount
181
LastEditorDisplayName
text
Body
I have two table The table structure goes something like this Table A <pre><code>╔══════╦════════╗ ║ P_ID ║ P_NAME ║ ╠══════╬════════╣ ║ 1 ║ name1 ║ ║ 2 ║ name2 ║ ║ 3 ║ name3 ║ ║ 4 ║ name5 ║ ╚══════╩════════╝ </code></pre> Table B <pre><code>╔═════╦════════╦════════╦═══════════╦═══════╗ ║ ID ║ P_ID ║ C_ID ║ C_PRICE ║ TIME ║ ╠═════╬════════╬════════╬═══════════╬═══════╣ ║ 1 ║ 1 ║ 3 ║ 11 ║ 11111 ║ ║ 2 ║ 2 ║ 4 ║ 22 ║ 22222 ║ ║ 3 ║ 3 ║ 5 ║ 33 ║ 33333 ║ ║ 4 ║ 3 ║ 6 ║ 44 ║ 44444 ║ ║ 5 ║ 3 ║ 6 ║ 55 ║ 55555 ║ ║ 6 ║ 4 ║ 7 ║ 66 ║ 66666 ║ ╚═════╩════════╩════════╩═══════════╩═══════╝ </code></pre> The requirement is 1. Join two table 2. Group By C_ID 3. The latest rows in Group By I tried to modify the answer By Bill Karwin from <a href="https://stackoverflow.com/questions/497535/how-do-i-join-the-most-recent-row-in-one-table-to-another-table/498179#498179">How do I join the most recent row in one table to another table?</a> <pre><code>SELECT e.*, s1.* FROM table_a e INNER JOIN table_b s1 ON (e.p_id = s1.p_id) LEFT OUTER JOIN table_b s2 ON (e.p_id = s2.p_id AND s1.id < s2.id) WHERE s2.p_id IS NULL; </code></pre> but I could not achieve what I want. From his answer I will get <pre><code>╔═════╦════════╦════════╦═══════════╦═══════╦═════════╗ ║ ID ║ P_ID ║ C_ID ║ C_PRICE ║ TIME ║ P_NAME ║ ╠═════╬════════╬════════╬═══════════╬═══════╬═════════╣ ║ 1 ║ 1 ║ 3 ║ 11 ║ 11111 ║ name1 ║ ║ 2 ║ 2 ║ 4 ║ 22 ║ 22222 ║ name2 ║ ║ 5 ║ 3 ║ 6 ║ 55 ║ 55555 ║ name3 ║ ║ 6 ║ 4 ║ 7 ║ 66 ║ 66666 ║ name5 ║ ╚═════╩════════╩════════╩═══════════╩═══════╩═════════╝ </code></pre> But the output what I want is as below ( dublicate P_ID is ok but for each dublicate P_ID should not have dublicate C_ID ) <pre><code>╔═════╦════════╦════════╦═══════════╦═══════╦═════════╗ ║ ID ║ P_ID ║ C_ID ║ C_PRICE ║ TIME ║ P_NAME ║ ╠═════╬════════╬════════╬═══════════╬═══════╬═════════╣ ║ 1 ║ 1 ║ 3 ║ 11 ║ 11111 ║ name1 ║ ║ 2 ║ 2 ║ 4 ║ 22 ║ 22222 ║ name2 ║ ║ 3 ║ 3 ║ 5 ║ 33 ║ 33333 ║ name3 ║ ║ 5 ║ 3 ║ 6 ║ 55 ║ 55555 ║ name3 ║ ║ 6 ║ 4 ║ 7 ║ 66 ║ 66666 ║ name5 ║ ╚═════╩════════╩════════╩═══════════╩═══════╩═════════╝ </code></pre>
Tags
<mysql><sql><join><greatest-n-per-group>
Title
Join table to get the latest rows from unique row
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. UScjmling
plurals
PostLinksPostIdRelatedPostId
1. 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
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
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.