I have a table of metals
MetalID integer
MetalName text
MetalCode text
Item table
ItemID integer
ItemName text
...
Metal1 int Ref.-> metals.metalID
Metal2 int Ref.-> metals.metalID
Metal3 int Ref.-> metals.metalID
I am trying to select three MetalCodes
SELECT m.MetalCode as 'Metal1', m.MetalCode as 'Metal2',m.MetalCode as 'Metal3'
FROM Item as k
INNER JOIN Metals AS m ON m.metalID=k.metal1
INNER JOIN Metals AS m ON m.metalID=k.metal2
INNER JOIN Metals AS m ON m.metalID=k.metal3
WHERE k.ItemID=?
Looks like I am doing it completely wrong. Please, help.
You should specify different aliases for your tables . you are calling all of them m.
SELECT m1.MetalCode as 'Metal1', m2.MetalCode as 'Metal2',m3.MetalCode as 'Metal3'
FROM Item as k
INNER JOIN Metals AS m1 ON m1.metalID=k.metal1
INNER JOIN Metals AS m2 ON m2.metalID=k.metal2
INNER JOIN Metals AS m3 ON m3.metalID=k.metal3
WHERE k.ItemID=?