#MYSQL JOIN LATEST RECORD TRIAL#

RIGHT OUTER JOIN Results are from the right table and matching data from the. LEFT OUTER JOIN Results are from the left table and matching data from the right table. INNER JOIN Results return matching data from both tables. The above is purely an example scenario to easily explain the joins I am trying to achieve and does not reflect an actual system design. FROM ARTICLES AS t -Join the the most recent history entries INNER JOIN REVISION lastHis ON t.ID lastHis.FKID -limits to the last history in the WHERE statement LEFT JOIN REVISION his2 on lastHis.FKID his2.FKID and lastHis.CREATEDTIME < his2.CREATEDTIME WHERE his2.ID is null. There are several MySQL JOIN types, and each type helps get different results when joining tables: 1. However, as a Customer may have multiple Addresses will the customer only be counted in the State of the most recent Address record? LEFT JOIN Address a ON a.CustomerID = c.CustomerID INNER JOIN Customer c ON c.CustomerID = p.CustomerID I would normally do something like: SELECT a.State, count(c.CustomerID) Therefore I'm not interested in any previous Address records for the Customer, only the most Recent (determined by AddressID). Such as 'How many customers last received a product in each State?'. What I would like to do is to list the number of customers for each State where the State is determined by the most recent Address record. Very often we need to select the most recent record or get the latest record for each date, user, id or any other group. Product (ProductID, CustomerID, Description)Ī customer can have multiple delivery addresses and mulitple products. Now I have that off my chest I can go back to using this in my real application.Imagine I have the following 3 tables in SqlServer: Customer (CustomerID, FirstName, LastName)Īddress (AddressID, CustomerID, Line1, City, State) So you need to do something like this: SELECT a.

#MYSQL JOIN LATEST RECORD TRIAL#

) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8 1 Answer Sorted by: 0 Without access to the specifics of your tables, the problem you face is knowing 'the most recent' trial (in table B) In many rdbms one can use ROWNUMBER () to solve this problem, but as yet MySQL does not supply that useful function. `saleID` int(10) NOT NULL auto_increment, ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 ago If using SSMS, you could use rownumber to do it as well. 9 17 comments Add a Comment Ddcooljoe 4 yr. `custID` int(10) NOT NULL auto_increment, left join and return only the latest record from right table IDDETAILS SUBIDDETAILS result that i want: I want to return only the latest and only one record per sub ID from right table. Here is the db dump if you want to play around. ON s1.custID = s2.custID AND s1.saledate s2.saledate ie even if there was no sale at all, I still want the customer data listed with NULLS for the sale data.Īnd the result set from the query below: custIDįor John and Winston we have the most recent sale they made. I want to list ALL customers together with the LAST sale they made. Very often we need to select the most recent record or get the latest record for each date, user, id or any other group. I have a table of customers and any sales they may have made. MySQL - Select Latest Record for Each Group. I am not a MySQL expert so there may be a better way to do this. SELECT FROM A LEFT JOIN B ON A.id (SELECT MAX(id) FROM B WHERE id. After spending a few hours searching and testing this one I thought I’d better share it since I found many similar questions but no answers. Easy solution to left join the 1 most/least recent row is using select over ON phrase.

Mysql join latest record