Question

Possible Duplicate:
convert MySQL SET data type to Postgres

I have postgresql 8.4.

I am trying to build up a query without success. I would like to insert elements into an array if they are not exists in the conserning row.

TABLE “test”:

+------------------+------------------+
| id               | varchar(20)      |
| timestp          | timestamp        |
| place            | varchar(20)      |
| myarray[][]      | varchar[14][254] |
+------------------+------------------+

+---------+---------------------+-----------+----------------+
|  xyz    | 2010-01-01 10:10:10 | nowhere   |  "{abc,qwert}" |
+---------+---------------------+-----------+----------------+

So I would like to add “{fgh,gfdsa}” to myarray WHERE (id=’xyz’ AND timestp=”2010-01-01 10:10:10″ AND place=’nowhere’) IF it is not already in myarray

I tried something like this>

UPDATE test
SET myarray = array_append(wascon2,'{fgh,gfdsa}') 
WHERE (id='xyz' AND timestp="2010-01-01 10:10:10" AND place='nowhere'
AND NOT EXISTS 1 FROM test WHERE (myarray='{fgh,gfdsa}')));

This doesnt work, it will append the array every time when I call it.

+---+---------------------------+-------------------------------------------+
|xyz|2010-01-01 10:10:10|nowhere|{"{abc,qwert}","{fgh,gfdsa}","{fgh,gfdsa}"}|
+---+---------------------------+-------------------------------------------+

If think I should use >

myarray = ANY ('{fgh,gfds}'::varchar[]) 

somehow but I cant find out how..

The best wolud be a plpgsql function for me.

Answer 1

UPDATE test
    SET myarray = myarray || array['fgh','gfdsa']::varchar[][]
    WHERE
        id = 'xyz'
        AND timestp = '2010-01-01 10:10:10'
        AND place = 'nowhere'
        AND not(myarray @> array['fgh','gfdsa']::varchar[][])
    ;