Solved

mysql update and get max(uploadDatetime)

Posted on 2015-01-05
2
387 Views
Last Modified: 2015-01-06
I have a query and I want to get the max datetime for the update does anyone know how I can do this

DROP Table if exists TEMP_PARTS;
CREATE TABLE TEMP_PARTS(SELECT  il.PartDesc as 'Tool Type', il.PartNumber, ip.Quantity, Cast('2012:01:01 12:00:00 AM'as DateTime) AS 'InsertDate', ip.InventoryListID, ip.locationID
                FROM Inventory_Parts as ip
                JOIN Inventory_InventoryList as il ON il.UID = ip.InventoryListID
                WHERE LocationID = 1 and isVisible = 1);
                
                UPDATE TEMP_PARTS tp
                JOIN Inventory_InventoryList as il ON il.UID = tp.InventoryListID
                JOIN Inventory_PartsHistory ph ON ph.InventoryListID = il.UID
//////I want tp.InsertDate = MAX(ph.InsertDate) WHERE///////////////////////////////// 
                Set tp.InsertDate = ph.InsertDate WHERE tp.PartNumber = il.PartNumber AND tp.LocationID = ph.locationID);
                
                SELECT * FROM TEMP_PARTS

Open in new window

0
Comment
Question by:r3nder
2 Comments
 
LVL 18

Accepted Solution

by:
Simon earned 500 total points
ID: 40532575
From what I can make out from your query (without table definitions) it looks like the UPDATE can be simplified to avoid the joins and just use a subquery to get the max(insertdate) for that item.

UPDATE TEMP_PARTS tp
Set tp.InsertDate = (select max(InsertDate) from inventory_PartsHistory WHERE InventoryListID = tp.InventoryListID AND  locationID=tp.LocationID);

Even if you DO need the join to Inventory_InventoryList, you'd still use a subquery to get the max(insertdate) from the Inventory_PartsHistory table.
0
 
LVL 6

Author Closing Comment

by:r3nder
ID: 40533506
Thanks Simon worked great
0

Featured Post

MIM Survival Guide for Service Desk Managers

Major incidents can send mastered service desk processes into disorder. Systems and tools produce the data needed to resolve these incidents, but your challenge is getting that information to the right people fast. Check out the Survival Guide and begin bringing order to chaos.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
When table data gets too large to manage or queries take too long to execute the solution is often to buy bigger hardware or assign more CPUs and memory resources to the machine to solve the problem. However, the best, cheapest and most effective so…
Via a live example, show how to shrink a transaction log file down to a reasonable size.
Viewers will learn how the fundamental information of how to create a table.

825 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question