Concatenate fields and use the Alias field to link another field in another table

DannerCorp
DannerCorp used Ask the Experts™
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I have two tables that I would like to link together for making labels.  I would like to link the tables together to get my results.   The issue lies when I inner join the tables.  table a has two fields and table b has one field that I need to link together to get my results.  I was able to get the alias to link the tables together, but I get stuck on how to link an alias to another table in the same query.

Here is the tables and my query
Work_Order
Base_ID       Lot_ID   Part_ID        Printed_Date
WO-00009    1           112A7000    12/31/2012

Trace
Part_ID         AProperty_1      SN
112A7000     WO-00009/1     SN1223

I would like the results to be
Part_ID          SN              Printed_Date
112A7000     SN1223      12/31/2012

I think my issue is with the Alias . .

SELECT WORK_ORDER.BASE_ID, WORK_ORDER.LOT_ID, WORK_ORDER.PART_ID, [WORK_ORDER].[BASE_ID]+ '/' + [WORK_ORDER].[LOT_ID] AS WO
FROM WORK_ORDER
INNER JOIN TRACE ON WORK_ORDER.PART_ID = TRACE.PART_ID AND WO = TRACE.APROPERTY_1
WHERE WORK_ORDER.PRINTED_DATE > 12/31/12

Thanks so much!!  Happy New Year!!
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Saurabh Bhadauria

Commented:
Try like this.... You can not use aliases in where clause....need to write full expression 

SELECT WORK_ORDER.BASE_ID, WORK_ORDER.LOT_ID, WORK_ORDER.PART_ID, [WORK_ORDER].[BASE_ID]+ '/' + [WORK_ORDER].[LOT_ID] AS WO
FROM WORK_ORDER
INNER JOIN TRACE ON WORK_ORDER.PART_ID = TRACE.PART_ID AND [WORK_ORDER].[BASE_ID]+ '/' + [WORK_ORDER].[LOT_ID] = TRACE.APROPERTY_1
WHERE WORK_ORDER.PRINTED_DATE > 12/31/12

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Pratima Pharande

Commented:
You said you need result like this
Part_ID          SN              Printed_Date
112A7000     SN1223      12/31/2012

for this result Query will be

Select Work_Order.Part_ID,SN ,Printed_Date From Work_Order
inner join Trace on Work_Order.Part_Id = Trace.Part_ID

To Correct your given query try this

SELECT WORK_ORDER.BASE_ID, WORK_ORDER.LOT_ID, WORK_ORDER.PART_ID, [WORK_ORDER].[BASE_ID]+ '/' + [WORK_ORDER].[LOT_ID] AS WO
FROM WORK_ORDER
INNER JOIN TRACE ON WORK_ORDER.PART_ID = TRACE.PART_ID AND ([WORK_ORDER].[BASE_ID]+ '/' + [WORK_ORDER].[LOT_ID]) = TRACE.APROPERTY_1
WHERE WORK_ORDER.PRINTED_DATE > '12/31/12'
Armand GSenior Programmer

Commented:
You certainly cannot use a column alias but you could try using subquery aliases if you're heavily using custom columns on your queries like this:

SELECT A.BASE_ID, A.LOT_ID, A.PART_ID, A.WO FROM 
(SELECT *, [WORKORDER].[BASE_ID]+ '/' + [WORKORDER].[LOT_ID] AS WO
FROM WORKORDER) A
INNER JOIN TRACE ON A.PART_ID = TRACE.PART_ID AND A.WO = TRACE.APROPERTY_1
WHERE A.PRINTED_DATE > 12/31/12

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A is the subquery alias and replaces the Work_Order table on the outer query.
awking00Information Technology Specialist

Commented:
select t.part_id, t.sn, x.printed_date
from trace t,
(select base_id + '/' + lot_id as aproperty_1, part_id, printed_date
 from work_order
 where x.printed_date > 12/31/2012) as x
where t.part_id = x.part_id and t.aproperty_1 = c.aproperty_1
Senior Programmer
Commented:
Though if the query I've posted is not working you can add apostrophe's or specify a long date format:
SELECT A.BASE_ID, A.LOT_ID, A.PART_ID, A.WO FROM 
(SELECT *, [WORKORDER].[BASE_ID]+ '/' + [WORKORDER].[LOT_ID] AS WO
FROM WORKORDER) A
INNER JOIN TRACE ON A.PART_ID = TRACE.PART_ID AND A.WO = TRACE.APROPERTY_1
WHERE A.PRINTED_DATE > '12/31/12'

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or
SELECT A.BASE_ID, A.LOT_ID, A.PART_ID, A.WO FROM 
(SELECT *, [WORKORDER].[BASE_ID]+ '/' + [WORKORDER].[LOT_ID] AS WO
FROM WORKORDER) A
INNER JOIN TRACE ON A.PART_ID = TRACE.PART_ID AND A.WO = TRACE.APROPERTY_1
WHERE A.PRINTED_DATE > '2012-12-31'

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A

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