Update multiple rows from results from a SELECT query to the same table

Question

I'm trying to figure out how to combine these two queries.

SELECT `o`.`Order_ID`
FROM `Orders` `o`
JOIN `CustomerDetails` `cd` ON `cd`.`Customer_ID` = `o`.`Customer_ID`
WHERE `o`.`OrderPlaceServerTime` >= '2013-06-01 00:00:00'
AND `o`.`OrderPlaceServerTime` <= '2013-06-31 23:59:59'
AND `cd`.`SalesRep_ID` = 6

This gives me a list of Order_ID s that I need to update with the SalesRep_ID = 6 from the above Query.

After I get the list of Order_ID s from the Query above I use...

UPDATE Orders SET SalesRep_ID =  '6'
WHERE  (Order_ID = 541304
OR  Order_ID = 541597
OR  Order_ID = 542318)

Doing so updates the orders with the correct SalesRep_ID .

Ultimately I'd like to combine these to make one query where I would just change the SalesRep_ID

Answer 1

A solution with proper UPDATE syntax with JOIN for MySql

UPDATE Orders o JOIN CustomerDetails d 
    ON d.Customer_ID = o.Customer_ID
   SET o.SalesRep_ID = 6
 WHERE o.OrderPlaceServerTime >= '2013-06-01 00:00:00'
   AND o.OrderPlaceServerTime <= '2013-06-31 23:59:59'
   AND d.SalesRep_ID = 6

Here is SQLFiddle demo

Answer 2

You can do it in a single query by just simply combining them:

UPDATE Orders SET SalesRep_ID =  '6'
WHERE Order_ID IN (
   SELECT `o`.`Order_ID`
   FROM `Orders` `o`
   JOIN `CustomerDetails` `cd` ON `cd`.`Customer_ID` = `o`.`Customer_ID`
   WHERE `o`.`OrderPlaceServerTime` >= '2013-06-01 00:00:00'
      AND `o`.`OrderPlaceServerTime` <= '2013-06-31 23:59:59'
      AND `cd`.`SalesRep_ID` = 6
);

Answer 3

There is a little trick to this. You have to fool MySQL into thinking that you are working on different tables.

UPDATE Orders SET SalesRep_ID =  '6'
WHERE  (Order_ID IN (SELECT order_id FROM (SELECT `o`.`Order_ID`
FROM `Orders` `o`
JOIN `CustomerDetails` `cd` ON `cd`.`Customer_ID` = `o`.`Customer_ID`
WHERE `o`.`OrderPlaceServerTime` >= '2013-06-01 00:00:00'
AND `o`.`OrderPlaceServerTime` <= '2013-06-31 23:59:59'
AND `cd`.`SalesRep_ID` = 6) AS TEMP));

Link to SQLFiddle