WHERE を AND にすると期待している結果が得られると思います。

久光 一誠 <ds1i-hsmt@xxxxxxxxxx>:

$B5W8w$H?=$7$^$9(B

$B2<5-$N$h$&$J#3$D$N%F!<%V%k$,$"$j!"(B

$B>&IJ%F!<%V%k(B(tabS)
[id] [name]
1 $B%F%l%S(B
2 $B@vBu5!(B

$B9q%F!<%V%k(B(tabK)
[id] [name]
1 $BF|K\(B
2 $BJF9q(B
3 $BCf9q(B

$B9qJL>pJs%F!<%V%k(B(tabJ)
[shouhin_id] [kuni_id] [jouhou]
1 1 $B>pJs(BA
1 3 $B>pJs(BB
2 2 $B>pJs(BC

$B$3$N%F!<%V%k9=@.$+$iNc$($P%F%l%S$K4X$9$k9qJL>pJs$r9q%F!<%V%k$N(Bid$B=g$K(B
$B!!>pJs(BA
$B!!!J6uCM$^$?$O(BNULL$B!K(B
$B!!>pJs(BB
$B$H$$$&7A$G<h$j=P$=$&$H;W$$(B

SELECT  tabJ.jouhou
FROM tabK LEFT JOIN tabJ ON tabK.id = tabJ.kuni_id
WHERE shouhin_id = 1
ORDER BY tabK.id

$B$H=q$$$?$N$G$9$,!"$3$l$G$O7k9g@h$,$J$$$b$N$O6uCM$^$?$O(BNULL$B$GJV$C$F$3$:!"4|BT$7$?7k2L$K$J$j$^$;$s$G$7$?!J>pJs(BA$B$H>pJs(BB$B$N#29T$7$+JV$C$F$3$J$+$C$?!K!#(B
$B>e5-$N%F!<%V%k9=@.$G!"9q%F!<%V%k$N(Bid$B=g$K1h$C$F9qJL>pJs%F!<%V%k$+$i!J>pJs$,$J$$>l9g$O6uCM$^$?$O(BNULL$B$,JV$C$F$/$k$h$&$K!K<h$j=P$9$K$O$I$s$J(BSQL$BJ8$r=q$$$?$i$$$$$G$7$g$&$+!)(B

$B$J$*9qJL>pJs%F!<%V%k$O>&IJ(BID$B$H9q(BID$B$N%;%C%H$,=EJ#$7$J$$;EAH$_$K$7$F$"$k$N$G!"0l$D$N>&IJ$KF1$89q$N>pJs$,J#?t8=$l$k$3$H$O$J$$A0Ds$G9M$($F$$$^$9!#(B

$B$h$m$7$/$*4j$$$$$?$7$^$9!#(B