I have the following table:
CREATE TABLE `graph` (
`tableid1` varchar(20) NOT NULL,
`tupleid1` int(11) NOT NULL,
`tableid2` varchar(20) NOT NULL,
`tupleid2` int(11) NOT NULL,
`node1` int(11) NOT NULL,
`node2` int(11) NOT NULL,
`weight` int(10) NOT NULL,
PRIMARY KEY (`tableid1`,`tupleid1`,`tableid2`,`tupleid2`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
and I'm running this query (note the 'group by'):
insert into graph (node1, node2, tableid1, tupleid1, tableid2,
tupleid2, weight)
select 0, 0, a.tableid, a.tupleid, b.tableid, b.tupleid, count(*)
from transactionlog a, transactionlog b
where a.transactionid = b.transactionid
and (a.tableid, a.tupleid) {'<'} (b.tableid, b.tupleid)
group by a.tableid, a.tupleid, b.tableid, b.tupleid
However, after running for a few hours, the query fails with the
following error:
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:
Duplicate entry 'new_order-248642-order_line-13126643' for key
'group_key'
How is this possible? There were no concurrently running queries
inserting into 'graph'. I'm using mysql-5.4.3; is this a beta
bug/anyone else happen to know something about this? Thanks in
advance.
--
Yang Zhang
http://www.mit.edu/~y_z/
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