mysql - Updating Multiple Tables with Join -


i have following query works fine:

$query = "update             mpt         join             compounds         on             compounds.mpt = mpt.id         set             mpt.supervisor_comments = " . $this->db->escape($comments['mpt']) . "                     compounds.id = " . $id;

and updates mpt table linked a row in compounds table particular id.

i try extending query update 2 fields @ once, however, @ point i'm told:

unknown column 'mpt.id' in 'on clause'  update mpt, bpt join compounds on compounds.mpt = mpt.id , compounds.bpt = bpt.id set mpt.supervisor_comments = 'abcd' compounds.id = 5

even though in previous example worked fine... suggestions or advice?

$query = "update                mpt, bpt            join                compounds            on                compounds.mpt = mpt.id , compounds.bpt = bpt.id            set                mpt.supervisor_comments = " . $this->db->escape($comments['mpt']) . "                           compounds.id = " . $id;

precedence join operator higher comma in tables list, when joining bpt compounds table mpt hasn't been joined yet. obvious fix count place parenthesis so:

update (mpt, bpt) join compounds on ...

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