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johnsql
Posting Yak Master
161 Posts |
 Posted - 2007-01-19 : 11:25:34
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| Hi, I have a question about the MEANING of a table column 'PriorLeaseID' which is a FOREIGN key of table 'lease' and then the column references to the same table itself 'lease':ALTER TABLE [dbo].[Lease] WITH NOCHECK ADD FOREIGN KEY([PriorLeaseID])REFERENCES [dbo].[Lease] ([leaID])Thanks in advance |
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AndrewMurphy
Master Smack Fu Yak Hacker
2916 Posts |
Posted - 2007-01-19 : 11:42:27
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| basically when you add a lease....which is derived/related (according to some business rules) to another lease (already in the system), then your sql definition will check that the instruction to insert/create a new lease verifies that the 'old lease value' supplied actually exist in the system.your code however does need to be made to work, when there is no priorlease number available/supplied...is when a fresh customer comes inthe door and asks for a lease.... |
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A foreign column references to the same table?