Coding challenge - Unique constraint between column in 2 different tables

Hi I have 3 tables like
project--> pk: projectid
category --> pk: categoryid FK: projecid
Buyer --> Pk: buyerid FK : Categoryid
each project can have multiple categories, and each category can have multiple buyer. I need to ensure that a buyer can be adde to a project (uniqueness of projectid & Buyer id). I tried with triggers and its erroring out. Is there a easier way to enforce this?

Selvaganapathy wrote:
Hi I have 3 tables like
project--> pk: projectid
category --> pk: categoryid FK: projecid
Buyer --> Pk: buyerid FK : Categoryid
each project can have multiple categories, and each category can have multiple buyer. I need to ensure that a buyer can be adde to a project (uniqueness of projectid & Buyer id). I tried with triggers and its erroring out. Is there a easier way to enforce this?I think there is a logical error in the problem description.
If one project can have multiple categories (P1 has C1 and C2) and one category can have multiple buyers (C1 has B1 and B2) then the project is automatically matched to two buyers (P1 has B1 and B2). This is against the rule project+buyer are unique.
I think Selvaganapathy should explain the business logic with a practical example. my feeling is that the unuiqness is only on part of the buyer, not on part of the project. Like one Buyer can only be matched to one project, but one project can have several buyers. But this would allow totaly different solutions. Like adding the project ID to the Buyer table as a foreign key.
Edited by: Sven W. on Aug 31, 2009 4:23 PM

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NOT NULL,
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NULL,
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NULL,
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OFF, ALLOW_ROW_LOCKS
= ON,
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ON)
ON [PRIMARY]
ON [PRIMARY]
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SET
ANSI_PADDING OFF
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TABLE [dbo].[SECTION](
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IDENTITY(1,1)
NOT NULL,
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NOT NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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ASC,
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ASC
)WITH
(PAD_INDEX
= OFF,
STATISTICS_NORECOMPUTE
= OFF,
IGNORE_DUP_KEY =
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= ON,
ALLOW_PAGE_LOCKS =
ON)
ON [PRIMARY]
ON [PRIMARY]
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SET
ANSI_PADDING OFF
GO
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TABLE [dbo].[TUITION_BILL](
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IDENTITY(1,1)
NOT NULL,
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NOT NULL,
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NOT NULL,
      [Acad_Level] [varchar](50)
NOT NULL,
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NOT NULL,
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NOT NULL,
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NOT NULL,
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NULL,
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NULL,
CONSTRAINT [PK_TUITION_BILL]
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CLUSTERED
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ASC,
      [DEPT_ID]
ASC,
      [Acad_Level]
ASC,
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ASC,
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ASC
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= OFF,
IGNORE_DUP_KEY =
OFF, ALLOW_ROW_LOCKS
= ON,
ALLOW_PAGE_LOCKS =
ON)
ON [PRIMARY]
ON [PRIMARY]
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SET
ANSI_PADDING OFF
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CREATE
TABLE [dbo].[TUITION_PAYMENT](
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IDENTITY(1,1)
NOT NULL,
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NOT NULL,
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NOT NULL,
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NOT NULL,
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NOT NULL,
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NOT NULL,
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and Veterinary','Mohamoud Abdilahi','065')
INSERT
INTO SECTION(SNAME,DEPT_ID,Acad_Level,SHIFT,[TIME],ROOM)VALUES('2A',1,'Year
2','Morning','8:00-10:00','Room 1')
INSERT
INTO TUITION_BILL(STUDENT_ID,DEPT_ID,Acad_Level,SECTION_ID,SEMESTER,Acad_Year,BILL_DATE,GROSS_AMT_DUE)
VALUES(138218,1,'Year
2',1,'One','2014-2015','2014-09-10',200.00)
INSERT
INTO TUITION_BILL(STUDENT_ID,DEPT_ID,Acad_Level,SECTION_ID,SEMESTER,Acad_Year,BILL_DATE,GROSS_AMT_DUE)
VALUES(138218,1,'Year
2',1,'Two','2014-2015','2015-01-10',200.00)
INSERT
INTO TUITION_PAYMENT(RECEIPT_NO,STUDENT_ID,DEPT_ID,Acad_Level,SECTION_ID,SEMESTER,Acad_Year,SCHOLARSHIP,
PAYMENT_DATE,PAYMENT_AMT,REFERENCE,REMARKS)VALUES(1,138218,1,'Year
2',1,'One','2014-2015',0.00,'2014-10-10',200.00,'N','N')

Coding challenge - Unique constraint between column in 2 different tables

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