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Full Discussion: MySQL join four tables!
Top Forums Programming MySQL join four tables! Post 302592391 by yifangt on Monday 23rd of January 2012 05:49:08 PM
Old 01-23-2012
MySQL join four tables!

Hello;
I want merge four MySQL tables to get the intersection that have a common field for all of them. Join two tables is fine to me, but my this case is different from common situations and there are not very many discussions about it. Can anybody give me some idea? Thanks a lot!
Here is part of my simplified tables (out of ~30000 rows per table and more than 10 columns of complicate formats, so that I do not want use shell command JOIN or other want to do the job!):
Code:
TableA:
A1   O
A2   P
A3   Q
A4   R
A5   S
A6   T

TableB:
B1   A1
B2   A2
B3   A3
B4   A4
B5   A1
B6   A2

Table C: 
C1   A1
C2   A2
C3   A2
C4   A4
C5   A4
C6   A1

TableD
D1   A1
D2   A2
D3   A3
D4   A4
D5   A5
D6   A1

The output is expected to be:
Code:
B1   A1   C1   A1   D1   A1   O   
B2   A2   C2   A2   D2   A2   P
B4   A4   C4   A4   D4   A4   R

My Code is:

SELECT
B.ID, B.AGI,
C.ID, C.AGI,
D.ID, D.AGI,
A.ID, A.AGI FROM TableB B, TableC C, TableD D, TableA A WHERE
B.AGI = A.ID
AND C.AGI = A.ID
AND D.AGI = A.ID
AND B.AGI = C.AGI
AND D.AGI = C.AGI
AND B.AGI = D.AGI;

But the output is not what I expected:
Code:
+------+------+------+------+------+------+------+------+
| ID   | AGI  | ID   | AGI  | ID   | AGI  | ID   | AGI  |
+------+------+------+------+------+------+------+------+
| B1   | A1   | C1   | A1   | D1   | A1   | A1   | O    |
| B5   | A1   | C1   | A1   | D1   | A1   | A1   | O    |
| B1   | A1   | C6   | A1   | D1   | A1   | A1   | O    |
| B5   | A1   | C6   | A1   | D1   | A1   | A1   | O    |
| B1   | A1   | C1   | A1   | D6   | A1   | A1   | O    |
| B5   | A1   | C1   | A1   | D6   | A1   | A1   | O    |
| B1   | A1   | C6   | A1   | D6   | A1   | A1   | O    |
| B5   | A1   | C6   | A1   | D6   | A1   | A1   | O    |
| B2   | A2   | C2   | A2   | D2   | A2   | A2   | P    |
| B6   | A2   | C2   | A2   | D2   | A2   | A2   | P    |
| B2   | A2   | C3   | A2   | D2   | A2   | A2   | P    |
| B6   | A2   | C3   | A2   | D2   | A2   | A2   | P    |
| B4   | A4   | C4   | A4   | D4   | A4   | A4   | R    |
| B4   | A4   | C5   | A4   | D4   | A4   | A4   | R    |
+------+------+------+------+------+------+------+------+
14 rows in set (0.00 sec)

Can anybody give me some idea? Got lost with the LEFT/ RIGHT/INNER JOINs. Expert suggestion can save me days of scratch. Thanks a lot!
 

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IRSEND(1)								FSF								 IRSEND(1)

NAME
irsend - basic LIRC program to send infra-red commands SYNOPSIS
irsend [options] DIRECTIVE REMOTE CODE [CODE...] DESCRIPTION
Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such as TV boxes, HiFi sets, etc. DIRECTIVE can be: SEND_ONCE - send CODE [CODE ...] once SEND_START - start repeating CODE SEND_STOP - stop repeating CODE LIST - list configured remote items SET_TRANSMITTERS - set transmitters NUM [NUM ...] SIMULATE - simulate IR event REMOTE is the name of a remote, as described in the lircd configuration file. CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file. NUM is the transmitter number of the hardware device. For the LIST DIRECTIVE, REMOTE and/or CODE can be empty: LIST "" "" - list all configured remote names LIST REMOTE "" - list all codes of REMOTE LIST REMOTE CODE - list only CODE of REMOTE The SIMULATE command only works if it has been explicitly enabled in lircd. -h --help display usage summary -v --version display version -d --device use given lircd socket [/var/run/lirc/lircd] -a --address=host[:port] connect to lircd at this address -# --count=n send command n times EXAMPLES
irsend LIST DenonTuner "" irsend SEND_ONCE DenonTuner PROG-SCAN irsend SEND_ONCE OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3 irsend SEND_STOP OnkyoAmpli VOL-DOWN irsend SET_TRANSMITTERS 1 irsend SET_TRANSMITTERS 1 3 4 irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S" FILES
/etc/lirc/lircd.conf Default lircd configuration file. It should contain all the remotes, their infra-red codes and the corresponding timing and wave- form details. DIAGNOSTICS
If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics: "irsend: could not connect to socket" "irsend: Connection refused" (or "Permission denied"). SEE ALSO
The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory. lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org. irsend 0.8.7pre1 May 2010 IRSEND(1)
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