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Basic Guidelines for Data Integrity in Enterprise Software
The original Relational Model of Data for Large Shared Data Banks [acm.org] was a major milestone in the history of information technology that has undergone changes in understanding over the years....
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Dynamic IN without Dynamic T-Sql for Sql Server
Here is stripped down T-Sql code that illustrates a “no dynamic sql” approach to the common requirement for SQL Server stored procedures to accept comma delimited ID values while maintaining strong...
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On Relations and Relationships: Sql and the Rise Of Relational Database...
E.F. (“Ted”) Codd conceived of his relational model for databases while working at IBM in 1969. Codd’s approach took a cue from first-order predicate logic, the basis of a large number of other...
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Time After Time: Temporal Modeling for Sql Audits and Historic Views
Most database designs can also provide a quick answer to questions of the form: “What information do I currently have right now about last week ?” However, historic questions like “What information...
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Time After Time: Creating a Valid Time Sql Server Audit Table
In an earlier post Time After Time: Temporal Modeling for Sql Audits and Historic Views I discussed the concept of Valid-Time tables. This is a powerful technique that can be used for many different...
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Time After Time: Sql Server Audit Triggers and Query Syntax
In the last post Time After Time: Creating a Valid Time Sql Audit Table, we created the basic data structures required for the audit tables. To complete the solution, we are now ready to create an...
View ArticleKey Issues for Databases
A database table’s primary key is the field or combination of fields that yield a distinct value for every row in a data table. Beging able to unambiguously distinguish every piece of information in a...
View ArticleOn Relations and Relationships: Relational Reality
To elucidate a simplistic example of this, if you had a company table and an employee table and each company row could have many employee row associated with it, you would (assuming they were...
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