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plurals

POInsert into MYSQL table last submission date for a review
primarykey
Id
16739599
data
AcceptedAnswerId
16740173
AnswerCount
2
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-05-24T16:26:18.223
FavoriteCount
0
LastActivityDate
2013-05-24T17:15:15.100
LastEditDate
2013-05-24T16:34:16.440
LastEditorUserId
318972
OwnerUserId
318972
ParentId
0
PostTypeId
1
Score
0
ViewCount
132
LastEditorDisplayName
text
Body
I have a table called 'ratings' which contains an index which is a unique ascending number, ProductId which is a product code, rate1 to rate5 are the number of times each product has recieved a 1 or 5 star rating by a customer aveRate is the average rating for each product and lastSubDate should be the timestamp of when the last review for each product was submitted but it's currently empty. <pre><code>id ProductId rate1 rate2 rate3 rate4 rate5 aveRate lastSubDate 18 9996637 0 0 0 0 1 5 0000-00-00 00:00:00 26 9996628 1 0 0 0 0 1 0000-00-00 00:00:00 34 9996618 0 0 0 1 0 4 0000-00-00 00:00:00 36 9996614 5 0 0 0 0 1 0000-00-00 00:00:00 48 9996592 5 0 1 0 3 3 0000-00-00 00:00:00 66 9996566 0 0 0 1 3 5 0000-00-00 00:00:00 </code></pre> In another table I have called 'last_rate_date' I have ProductId and the date the product was last rated under lastSubDate. In this table the Product Id's can appear several times as per the example as each row represents a time a review was submitted by a customer. <pre><code>ProductId lastSubDate 9996665 2009-05-22 19:45:05 9996665 2009-08-06 11:30:07 9996665 2010-11-10 08:30:17 9996665 2011-06-10 09:15:47 9996665 2011-06-12 05:15:39 </code></pre> My questions is how can I modify the first table 'ratings' using SQL to insert the last time a product was reviewed under the 'lastSubDate' using the second table 'last_rate_date' to lookup the productId and the date bearing in mind each ProductId may appear mutiple times in this seconds table with differen't dates. This needs to be one as a one off table modification to the first table. Adter this is done I will amend the script which adds data to ratings table to always add a timestamp in the future when it's updated.
Tags
<mysql><timestamp>
Title
Insert into MYSQL table last submission date for a review
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USBen Paton
UserOwnerUserId
1. USBen Paton
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
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
1. This table or related slice is empty.

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