无法使用我的SQL查询访问表。 没有得到理想的结果

Question

I'm having trouble displaying setid's from the table 'sets' with my SQL query. I'm only receiving setid's from 'inventory', not from 'sets'.

$setidquery = "SELECT inventory.itemid,
                        inventory.setid,
                        inventory.colorid,
                        inventory.itemtypeid,
                        colors.colorname,
                        parts.partname,
                        parts.partid,
                        sets.setid
                        FROM inventory
                        JOIN parts ON inventory.itemid = parts.partid
                        JOIN colors ON inventory.colorid = colors.colorid
                        JOIN sets ON sets.SetID = inventory.SetID
                        WHERE sets.setid = '$_COOKIE[setid]'
                        ORDER BY partname ASC
                        LIMIT 1000";

'$_COOKIE[setid]' is a search from a previous stage, so as you can probably guess, that will be the specific 'SetID'. But when enter a setid from the table sets, nothing shows up.

For example the set 375-2 shows up fine, because that set is in the table inventory, but the set 0011-2 does not show up, because that one is in the table sets.

Database scheme: http://weber.itn.liu.se/~stegu76/TNMK30-2016/legodatabasen.pdf

Goal: To print a table with sets from both inventory and sets.

Sorry for repeating myself a lot, just trying to be specific.

Answer 1

If you use JOIN it only get's the records where sets.SetID = inventory.SetID match. If you only have a record in the table sets and not in inventory the records don't match with your join. You probably need to use RIGHT JOIN to also show records that don't have matching results with the Inventory table.