Question

I’m having some problems in getting the correct query for my needs

SELECT tbl_participants.name, 
       tbl_transactions.consumer_rfid, 
       tbl_transactions.trans_price 
FROM   tbl_participants, 
       tbl_transactions 
WHERE  tbl_participants.id = tbl_transactions.trader_id

What I have is 2 simple table: one stored the participants (traders/consumers) the other one the transactions (form trader to consumer). I’m trying to bring back the following information: trader’s name, consumer’s name and price of transaction

tbl_participants has id(unique), name (of participant)
tbl_transactions has trader_id(taken from above table), consumer rfid(taken from above table)

my query should return the trader’s name (based on id), consumer’s name (based on rfid) and value of transaction

Thank you

Answer 1

Just a semi-wild guess from reading the comments:

SELECT tbl_participants.name AS consumer,
       tbl_transactions.trans_price AS price
FROM   tbl_participants,
       tbl_transactions
WHERE  tbl_participants.id = tbl_transactions.trader_id;

I can’t make up what you mean by name | consumer name | price…

EDIT: After some more information, this is what I came up with:

SELECT p1.name AS name,
       p2.name AS consumer_name,
       t.trans_price AS price
FROM   tbl_participants p1,
       tbl_participants p2,
       tbl_transactions t
WHERE  p1.id = t.trader_id
AND    p2.card_rfid = t.consumer_rfid;