Master detail problem

Forgot to say I am using TQuery.
Thanks
Andy

Hello!

Can you please be more specific like all fields you need to be returned and from what table, so I can help you

hi,

let suppose you have "Customer" table:
id_customer int not null primary key,
customer_name varchar(50)

use select statement:

and "debts" table:
fk_customer int not null references customer(id_customer),
debth_date timesatmap,
debth_info varchar

select id_customer, customer_name
from customer, debts
where id_customer = fk_customer

in this case no master records will be selected if record has not details


-------
Igor

Hi Igor,Freshman3k  

If you use the database wizard from delphi's menu , and create a form using the options master/detail form and
create a form using TQuery objects use DBdemos alias and master customer and detail orders, now run the program and scroll down the list you will come across a master record but no detail , now I don't want any master if no detail is available.

If you could show me how to do this with the above demo I would be able to adapt my program.

Thanks for your help.

Andy

select * from mastertable where id in (select master_id from childtable)

use this select for your master and you will have the effect you want

meikl ;-)

hi igor, freshman :-))

Hi Meikl,

Can you do me an example based on my previous comment.

Thaks

Andy

well,
i will post it this evening in about 3 hours

meikl ;-)

Hi Meikl,

Can you do me an example based on my previous comment.

Thaks

Andy

Thanks Meikl

Thanks Meikl the points are yours.

Thanks for you comments Igor, freshman3k.

Andy

HI,
If you want TO SHOW the master records which don't have the corresponding detail records you use OUTER joins.
If you DON'T want TO SHOW those records you use inner joins.
That's all.
Sincerely,
Nestorua.

Thanks nestorua.

Meikl can you help me a little more?

Your solution works fine if no detail record exists at all, but if the detail records are not available because you have selected  orders.Amountpaid < 70000 the solution does not work.

How can I make it work?

Select
  orders."OrderNo",
  orders."CustNo",
  orders."SaleDate",
  orders."ShipDate",
  orders."EmpNo",
  orders."ShipToContact",
  orders."ShipToAddr1",
  orders."ShipToAddr2",
  orders."ShipToCity",
  orders."ShipToState",
  orders."ShipToZip",
  orders."ShipToCountry",
  orders."ShipToPhone",
  orders."ShipVIA",
  orders."PO",
  orders."Terms",
  orders."PaymentMethod",
  orders."ItemsTotal",
  orders."TaxRate",
  orders."Freight",
  orders."AmountPaid"
From "orders.db"
As orders
Where
  "orders"."CustNo" =:"CustNo"
and  orders."AmountPaid" > 70000   <===  This line added

hi all,

hi meikl,


i think that statement bellow will do the same and may be faster (not sure):

select customer.* from customer, orders
where orders.custno = customer.custno


-----
Igor.

yep, igor, should be faster,

asw, you must move the where part into the masterquery

(just taking igors suggestion)
select customer.* from customer, orders
where orders.custno = customer.custno
and  orders."AmountPaid" > 70000  

or from the graded answer

Select
 customer."CustNo",
 customer."Company",
 customer."Addr1",
 customer."Addr2",
 customer."City",
 customer."State",
 customer."Zip",
 customer."Country",
 customer."Phone",
 customer."FAX",
 customer."TaxRate",
 customer."Contact",
 customer."LastInvoiceDate"
From "customer.db"
As customer
where  customer."CustNo"  in (select orders."CustNo" from "orders.db" As orders where orders."AmountPaid" > 70000)

hope this helps

meikl ;-)

Thanks Meikl, Igor
that works excellent.

Can you recommend anywhere I can learn about sql statements

Andy

well andy,

go to
http://www.sqlcourse.com/

thats an interactive sql-tutorial and
shows the basics for sql-statements and
you can test yourself there

meikl ;-)

Thank meikl