greatest-n-per-group

I have a correlated subquery that will return a list of quantities, but I need the highest quantity, and only the highest. So I tried to introduce an order by and a LIMIT of 1 to achieve this, but MySQL throws an error stating it doesn't yet support limits in subqueries. Any thoughts on how to work around this? SELECT Product.Name, ProductOption.Name, a.Qty, a.Price, SheetSize.UpgradeCost, FinishType.Name, FinishOption.Name, FinishTierPrice.Qty, FinishTierPrice.Price FROM `Product` JOIN `ProductOption` ON Product.idProduct = ProductOption.Product_idProduct JOIN `ProductOptionTier` AS a ON a

I have a History table (like a log) that records changes to parts: TransactionID Part ID Description Last Updated 1 1 Fixed O-ring 2006-03-14 20:00:04.700 2 2 Replaced coil 2009-01-02 20:00:04.700 3 1 Replaced coil 2009-01-02 20:00:04.700 4 1 Replaced LED 2002-08-20 20:00:04.700 5 2 Sealed leakage 2007-03-08 20:00:04.700 6 3 Replace connector 2004-05-16 20:00:04.700 I have another table that will show what each Part ID stands for, but that is not the problem I'm facing now. I'm required to write a query that returns the latest maintenance done on every parts. So in this case, my expected

If I have a table with the following fields ID, SomeFK, SomeTime How would I write a query return the latest/top 3 items (based on SomeTime ) for each SomeFK . So, the result might look like SomeFK Sometime 0 2012-07-05 0 2012-07-04 0 2012-07-03 1 2012-07-03 1 2012-07-02 1 2012-07-01 2 2012-07-03 2 2012-07-02 2 2012-07-01 ....etc.... Returning the latest items for a particular SomeFK is easy, but i just can't think how to do it for the above. I also feel it should be dead simple! EDIT: Apologies, I missed a key bit of information. this is for SQL2000, so ROW_NUMBER() can't be used! SELECT

I have a table that looks similar to this: credit +---------+----------------+-------------+--------------+-------------------------+ | id (PK) | person_id (FK) | transaction | total credit | date_time | +---------+----------------+-------------+--------------+-------------------------+ | 345 | 1 | -1.00 | 34.50 | 2018-08-29 12:00:00.000 | | 897 | 1 | 5.45 | 39.95 | 2018-08-29 12:34:00.000 | | 378 | 2 | 0.01 | 0.01 | 2018-08-29 08:00:00.000 | | 789 | 2 | 20.00 | 20.01 | 2018-08-29 09:00:00.000 | +---------+----------------+-------------+--------------+-------------------------+ How would I

I know the title of the post is bad but hear me out. A question like this arose the other day at work, and while I found a way around it, the problem still haunts me. Lets assume Stackoverflow has only 3 tables. Users ( username ) Comments ( comment, creationdate ) UsersCommentsJoin , this is the join table between the first 2 tables. Now lets say I want to make a query that would return the all the users with the last 2 most recent comments. So the result set would look like this. |username| most recent comment | second most recent comment| How on earth do I go about creating that query ? I

I need to write a SQL-Server query but I don't know how to solve. I have a table RealtimeData with data: Time | Value 4/29/2009 12:00:00 AM | 3672.0000 4/29/2009 12:01:00 AM | 3645.0000 4/29/2009 12:02:00 AM | 3677.0000 4/29/2009 12:03:00 AM | 3634.0000 4/29/2009 12:04:00 AM | 3676.0000 // is EOD of day "4/29/2009" 4/30/2009 12:00:00 AM | 3671.0000 4/30/2009 12:01:00 AM | 3643.0000 4/30/2009 12:02:00 AM | 3672.0000 4/30/2009 12:03:00 AM | 3634.0000 4/30/2009 12:04:00 AM | 3632.0000 4/30/2009 12:05:00 AM | 3672.0000 // is EOD of day "4/30/2009" 5/1/2009 12:00:00 AM | 3673.0000 5/1/2009 12:01:00