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t-sql joins


t-sql joins

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inevercheckthis2002
inevercheckthis2002
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I have three tables.

TableA
id_number
date
name

TableB
id_number
notes
status

TableC
id_number
location
item

Sometimes data may be entered in TableA and TableB.
Sometimes data may be entered in TableA and TableC.
Sometimes data may be entered in TableA and TableB and Table C..

I would like to return:
A.id_number B.notes B.status C.location C.item

..leaving fields from B or C empty when there is no data from them.

So, I have:

SELECT A.id_number B.notes B.status
FROM TableA as A
INNER JOIN TableB as B
ON A.id_number = B.id_number

...and I have
SELECT A.id_number C.location C.item
FROM TableA as A
INNER JOIN TableC as C
ON A.id_number = C.id_number


...how do I then combine the two so that I get
A.id_number B.notes B.status C.location C.item


Thanks....
Jan Van der Eecken
Jan Van der Eecken
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Just OUTER JOIN tableA, tableB and tableC on id_number.

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Sean Lange
Sean Lange
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Like this:


SELECT A.id_number, B.notes, B.status, C.location, C.item
FROM TableA as A
LEFT JOIN TableB as B ON A.id_number = B.id_number
LEFT JOIN TableC as C ON A.id_number = C.id_number



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inevercheckthis2002
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Jan Van der Eecken (6/19/2013)
Just OUTER JOIN tableA, tableB and tableC on id_number.


Point of clarification -- sometimes data will be entered in TableA and not in TableB or TableC. We do not want the rows from TableA unless there is matching data in TableB and/or TableC.

My understanding is that an outer join would return all rows from TableA.
Kingston Dhasian
Kingston Dhasian
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inevercheckthis2002 (6/20/2013)
Jan Van der Eecken (6/19/2013)
Just OUTER JOIN tableA, tableB and tableC on id_number.


Point of clarification -- sometimes data will be entered in TableA and not in TableB or TableC. We do not want the rows from TableA unless there is matching data in TableB and/or TableC.

My understanding is that an outer join would return all rows from TableA.


Quite simple. Add a WHERE clause to the query provided by Sean.

SELECT A.id_number, B.notes, B.status, C.location, C.item
FROM TableA as A
LEFT JOIN TableB as B ON A.id_number = B.id_number
LEFT JOIN TableC as C ON A.id_number = C.id_number
WHERE B.is_number IS NOT NULL OR C.id_number IS NOT NULL




Kingston Dhasian

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