add values with 'on duplicate key' - mysql

Question

I have the folowing array called $words
Array
(
[0] => Array
(
[token] => dwA
[pos] => *DII.7,8*
)
[1] => Array
(
[token] => nTr
[pos] => *DI.5,9*
)
[2] => Array
(
[token] => dwA
[pos] => *DI.2,8*
)
[3] => Array
(
[token] => nTr
[pos] => *DI.2,8*
))
I want to insert it with the following :
foreach ($words as $value)
{
$word = $value['token'];
$attestation = $value['pos'];
$insert="INSERT INTO Examples (Word, Attestation) VALUES ('$word', '$attestation')
mysql_query($insert) OR die(mysql_error());
}
The table 'Examples' has a key called ID with auto increasement;
the field word is 'unique'
what I want is that in the field 'Attestation' the values are added each time the 'word' is the same
so the result should be the following:
Id word Attestation
1 dwA *DII.7,8*, *DI.2,8*
2 nTr *DI.5,9*, *DI.2,8*
so I tried to add a 'on duplicate key' phrase
foreach ($words as $value)
{
$word = $value['token'];
$attestation = $value['pos'];
$insert="INSERT INTO Words2 (Word, Attestation) VALUES ('$word', '$attestation')
on duplicate key update Attestation =
";
mysql_query($insert) OR die(mysql_error());
}
but I can't figure out what I have to add after Attestation = so that the differents attestations are added one after the other, like for example : DI.5,9, DI.2,8
Or is the 'on duplicate key' not the correct way to do this?

Answer 1

Try this;
INSERT INTO Words2 (Word, Attestation) VALUES ('$word', '$attestation')
on duplicate key update Attestation = CONCAT(Attestation, ', ', '$attestation')
Although, it may a bit difficult to break those values apart later on. You may want to consider another table, so you can set up a one-to-many relationship.