Using Triggers for UPDATE Tables MySQL - mysql

Question

I have a TEMP table that is fed data using a Stored Proc when the table is shown through the website. This works great. I have this table as an editable one so that if/when the data in this table is edited then it will send the updated data back to my TEMP table, again this updates as it should. I now have a Trigger that will take certain fields from the TEMP and update my LIVE db table.
My problem is that when I add in other fields to update based on what is UPDATED it will do so for each row within the TEMP table. I have tried various ways, below being my last attempt to just update that particular row.
CREATE
DEFINER = 'user'#'%'
TRIGGER update_epcplanneddate
AFTER UPDATE
ON ims.temp_tobebooked
FOR EACH ROW
BEGIN
UPDATE epc_planning p
INNER JOIN temp_tobebooked b ON b.PropID = p.PropID
SET
p.EPCStatus = CASE WHEN p.PropID = b.PropID THEN 3 END,
p.EPCPlannedDate = b.EPCPlannedDate,
p.EPCBookingDate = CASE WHEN p.PropID = b.PropID THEN NOW() END,
p.LastUpdateDate = CASE WHEN p.PropID = b.PropID THEN NOW() END,
p.LastUpdateUser = b.InputBy
WHERE p.PropID = b.PropID;
END
How can I update what I need to update along with the extra fields based on this UPDATE?

Answer 1

So changing the JOIN to using NEW.colum the Trigger now looks like this
CREATE
DEFINER = 'user'#'%'
TRIGGER update_epcplanneddate
AFTER UPDATE
ON temp_tobebooked
FOR EACH ROW
BEGIN
UPDATE epc_planning p
SET
p.EPCStatus = 3,
p.EPCPlannedDate = NEW.EPCPlannedDate,
p.EPCBookingDate = NOW(),
p.LastUpdateDate = NOW(),
p.LastUpdateUser = NEW.InputBy
WHERE p.PropID = NEW.PropID;
END