How to retrieving the last record in each group?
SELECT p1.postid FROM Posts p1 INNER JOIN (SELECT pi.owneruserid, MAX (pi.postid) AS maxpostid FROM Posts pi GROUP BY pi.owneruserid) p2 ON (p1.postid = p2.maxpostid) WHERE p1.owneruserid = 20860; 1 row in set (1 min 17.89 sec) Even the EXPLAIN analysis takes over 16 seconds: Now produce the same query result using my technique with LEFT JOIN:
How to get last record in each MySQL Group?
The group by will always return the first record in the group on the result set. SELECT id, category_id, post_title FROM posts WHERE id IN ( SELECT MAX(id) FROM posts GROUP BY category_id ); This will return the posts with the highest IDs in each group.
Where do I find the number of records I have?
On the Design tab, in the Query Setup group, click the down arrow next to All (the Top Values list), and either enter the number of records that you want to see, or select an option from the list. Click Run to run the query and display the results in Datasheet view.
How is an update query used in a database?
You can think of update queries as a powerful form of the Find and Replace dialog box. You cannot use an update query to add new records to a database, or to delete records from a database. To add new records to a database you use an append query, and to delete whole records from a database you use a delete query.
How to show most recent record in group by studentID?
FROM temp t2 INNER JOIN ( SELECT MAX (DateApproved) as MaxDate, StudentId FROM temp GROUP BY StudentId ) t1 ON t1.MaxDate = t2.DateApproved and t1.StudentId = t2.StudentId Thanks for contributing an answer to Stack Overflow!
How to get the last post in each category?
I want to be able to get the last post in each category which are Title 3, Title 5 and Title 6. To get the posts by the category you will use the MySQL Group By keyboard. But the results we get back from this query is. The group by will always return the first record in the group on the result set.