Change MYSQL Query UPDATE to REPLACE INTO

Question

The query seems to be easy enough to convert as I have very specific requirement, if it exists just update else insert. But I am having really hard time converting it..probably because of multiple joins it is using. There is a catch to it though, there is no primary key.I would really appreciate it if someone take a crack at it and make my life easier ... :-)

There are only three columns for the table

ASSET_ASSOCIATION
-----------------

ASSET_ID | ASSET_FIELD_ID | ASSET_ASSOCIATED_ID

10        46               15
12        46               37
10        21               8

Query I am using is

.....

Is there any hope for me ?? Would really appreciate any help .....

Answer 1

http://dev.mysql.com/doc/refman/5.6/en/replace.html

REPLACE works exactly like INSERT , except that if an old row in the table has the same value as a new row for a PRIMARY KEY or a UNIQUE index , the old row is deleted before the new row is inserted.

No primary key or unique index, no REPLACE , full stop.

A table without a primary key is (almost always) a huge mistake. Get in touch with the DBA (or someone with sufficient privilege) and let him/her know there is no primary key on the table. S/he will add the primary key without you asking for it.