Help! Howto use the join function in a query with select distinct ?

Hi!
I have 2 tables. I want to select only 1 painting of each artists.
select distinct idartist
from tbl_artworks
where blah blah blah
order by rand()
how does the "join" function work for add: name, lastname, title, image and much more... i try... but i fail...
tbl_artists
idartist
name
lastname
1
Paul
Gaugain
2
Vincent
Van Gogh
3
Pablo
Picasso
tbl_artworks
idartwork
idartist
title
image
1
1
days of gods
image1.jpg
2
2
sunflower
image2.jpg
3
3
Dora maar au chat
image3.jpg
4
2
Sky
image4.jpg
5
3
La vie
image5.jpg

Getting a single random image for each probably requires a combination of sql and cf. It would take someone smarter than me to do it with sql alone. I would probably try something like this:
1. Run a database query that gets all the images from all the artists.
2. Run a Q of Q that gets a distinct list of artist ids.
3. Loop through that list and run a Q of Q to get all the images for that artist.
4. Still in that loop, use randrange (1 to the recordcount) to select a random record from your Q of Q

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How can I use the join condition for this query?

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Hi, If you insist inner joins then please try
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FROM
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>
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Waiting for event (power: off, protocol: unknown/undefined)...
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>
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rsp: 707041746e65696c4374736554 90a4
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_EXCHANGE_TPDU) R-TPDU: 00000f70704
1746e65696c437473655490a475
Raw reply data: 0000000f707041746e65696c437473655490a475
Sending reply...
Waiting for event (power: on, protocol: t=1)...
Raw event data: 060040041122334400
Event: VCAD_EC_EXCHANGE_TPDU (0x06) C-TPDU: 0040041122334400
Processing app. command...
App. block:
NAD: 0x00
PCB: 0x40 (T1_I_BLOCK); Seq. #: 1; More data: 0
LEN: 4
INF:
11223344
EDC: 0x00
cmd name: N/A (class #1)
cmd: 11223344
Responding with the reversed command data, SW is hardcoded to 90<INS>
rsp: 9022
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_EXCHANGE_TPDU) R-TPDU: 0040029022f
0
Raw reply data: 000040029022f0
Sending reply...
Waiting for event (power: on, protocol: t=1)...
Raw event data: 03
Event: VCAD_EC_POWER_OFF (0x03)
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_POWER_OFF)
Raw reply data: 00
Sending reply...
Waiting for event (power: off, protocol: unknown/undefined)...
>
If someone know how to use this function or have any advice to help me to select a specific protocol with Jcop API, please let me know.
If you you need any more information don't hesitate to ask.
Best regards
Edited by: Cyril on Sep 22, 2011 9:54 AM

-1
I'm using a virtual terminal (windows driver), and I don't see how I could turn off the Auto-pps. I've also tried with a real reader and a card and I have the same error.
-2
I've tried value in the range of the atr (based on this analysis: [url http://smartcard-atr.appspot.com/parse?ATR=3b909580811fc7dc]http://smartcard-atr.appspot.com/parse?ATR=3b909580811fc7dc ). But I don't know if only I value of baud-rate is possible in the range. Anyway I just would like to change the protocol, not the baud-rate.
-3
I've already tried to call pps function before, after the first reset, or with another reset later and I always got the same thing.
 term = (PCSCJCTerminal)JCTerminal.getInstance("PCSC", readers.get(0).toString().substring(15));
 term.open();
 System.out.println("\nTerminal opened");
 //Getting the ATR
 atr = new ATR(term.waitForCard(2000));
 System.out.println("ATR: "+toHex(atr.getBytes()));
 jcard = new JCard(term,atr,0);
 jcard.reset();
 try {
 term.pps(JCTerminal.PROTOCOL_T0, (int)312500);
 } catch (Exception e) {
 e.printStackTrace();
 }The same pps is always send after each reset...

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