Question

Update table

Asked by: Asw

Hi,

I have a table contaning Quantity, Company fields, I have another table contaning July, Company fields.

I need to transfer the Quantity from the first database to the july field in the second database where the company in the first database is = to the company in the second database.

I would like to use the sql update statement,

How will I do this?

The database is paradox.

Thanks
Asw

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Asked On
2004-02-28 at 06:25:20ID20901175
Tags

table

,

update

Topic

Delphi Programming

Participating Experts
3
Points
250
Comments
10

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Answers

 

by: bpanaPosted on 2004-02-28 at 06:29:54ID: 10476043

for SQL Server:

update T2
set T2.July = T1.Quantity
from YourTable1 T1, YourTable2 T2
where T1.Company = T2.Company

maybe is the same for paradox tables

 

by: aikimarkPosted on 2004-02-28 at 14:18:02ID: 10477755

Update YourTable2 As T2
Set T2.July =
(Select T1.Quantity
From YourTable1 As T1
Where T1.Company = T2.Company)

 

by: AswPosted on 2004-02-28 at 23:16:43ID: 10479161

Hi aikimark,  bpana,

They dont work.

Thanks
Asw

 

by: bpanaPosted on 2004-02-28 at 23:31:07ID: 10479179

hi asw,

what does it mean that they fddon't work?
you get an error message?

bogdan

 

by: AswPosted on 2004-02-29 at 02:31:29ID: 10479546

Hi bpana,

I get an error message Invalid use of keyword token from line number 3.

Thanks
Asw

 

by: mocartsPosted on 2004-02-29 at 02:43:33ID: 10479580

UPDATE TABLE_JULY SET JULY=(SELECT QUANTITY FROM TABLE_CURRENT WHERE TABLE_JULY.COMPANY_ID=TABLE_CURRENT.COMPANY_ID)

generally must work. what db acces layer do you use? (BDE, ADO etc)

wbr, mo.

 

by: AswPosted on 2004-02-29 at 03:16:17ID: 10479662

Ok aikimarks example works now;

Update Dot As T2
Set T2.July =
(Select T1.sumQuantity
From dump As T1
Where T1.Company = T2.Company)

but if the company has 2 orders for july then I get an error:  Single row subquery produced more than 1 row.

Any ideas how to get round this?

Thanks
Asw

 

by: mocartsPosted on 2004-02-29 at 03:21:06ID: 10479671

with aggregates I think
just rewrite your subquery:

(Select SUM(T1.sumQuantity) From dump As T1 Where T1.Company = T2.Company Group By T1.Company)

wbr, mo.

 

by: AswPosted on 2004-02-29 at 03:26:50ID: 10479681

Thanks Mocarts,

I will give it a try and come back to you.

Asw

 

by: aikimarkPosted on 2004-02-29 at 05:02:14ID: 10479918

ASW,

<but if the company has 2 orders for july then I get an error:  Single row subquery produced more than 1 row.>

What you have asked us is to provide an Update query for your two tables.  It appears that what you would LIKE to do (use a single SQL Update statement) is not possible in your production environment.  Here are some questions for us all.
1) Do both/all of these multiple July entries contain valid data?
2) Is it acceptable to drop/ignore one of these July entries?
3) Is one of these July entries more valid? (supercedes)
4) If 3) is true, what criteria is used to select the most valid row?

One simple work-around is:
(Select FIRST T1.sumQuantity ...
or
(Select LAST T1.sumQuantity ...

I'm not sure if the FIRST or LAST keywords are supported by your database engine.

Other solutions require us to use a datetime field or autonumber field as a tie-breaker.  We don't know that much detail about the tables' definitions.

==============================
I think there's something flawed with the design or data validation if there are multiple records, then some other processing must take place before updating the table, as mocarts comment indicates -- sum the quantity field before updating.

==============================
mocarts,

Is the Group By really necessary?  This should work:
(Select SUM(T1.Quantity) From YourTable1 As T1 Where T1.Company = T2.Company)

20120131-EE-VQP-002

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