Update query failing with error : 1175

Question

I am trying to update a table using the following query

update at_product A join
(
SELECT atbillfields.billeditemguid,count(*) AS numberOfPeopleBought
    ,sum(atbillfields.billeditemqty) AS soldquantity
FROM jtbillingtest.at_salesbill atsalesbill 
JOIN jtbillingtest.at_billfields atbillfields
    ON atsalesbill.billbatchguid=atbillfields.billbatchguid
WHERE atsalesbill.billcreationdate BETWEEN '2013-09-09' AND date_add('2013-09-09', INTERVAL 1 DAY)
GROUP BY atbillfields.billeditemguid) B ON B.billeditemguid = A.productguid
SET A.productQuantity = A.productQuantity - B.soldquantity

But, getting the following exception:

Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect.

When I gave a where clause with the update like A.productQuantity = 1, it updated that particular.

Can someone point why I am unable to execute the query and how to solve the issue?

Answer 1

Have a look at:

http://justalittlebrain.wordpress.com/2010/09/15/you-are-using-safe-update-mode-and-you-tried-to-update-a-table-without-a-where-that-uses-a-key-column/

If you want to update without a where key you must execute

SET SQL_SAFE_UPDATES=0;

right before your query.

Another option is to rewrite your query o include a key.

Answer 2

This error means you're operating in safe update mode and therefore you have two options:

• you need to provide a where clause that includes an index for the update to be successful or
• You can disable this feature by doing SET SQL_SAFE_UPDATES = 0;