March 2018
Intermediate to advanced
816 pages
19h 35m
English
Content preview from SQL Server 2017 Developer???s Guide
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Temporal constraints
Depending on the business problem you are solving, you might need to implement many temporal constraints. Remember that for application time, SQL Server does not help you much. You need to implement the constraints in your code, using SQL Server declarative constraints where possible. However, most of the constraints you need to implement through custom code, either in triggers or in stored procedures, or even in the application code.
Imagine the Suppliers table example. One supplier can appear multiple times in the table because the same supplier could be under contract for separate periods of time. For example, you could have two tuples like this in the relation with the shortened header Suppliers (supplierid, companyname ...
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