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| Articles about Constraints |
| What is data integrity? Explain constraints? | | 2008-04-11 08:21:15 | | Data integrity is an important feature in SQL Server. When used properly, it ensures that data isaccurate, correct, and valid. It also acts as a trap for otherwise undetectable bugs within applications.A PRIMARY KEY constraint is a unique identifier for a row within a database table. Every table shouldhave a primary key constraint to uniquely identify each row and only one primary key constraint can becreated for each table. The primary key constraints are used to enforce entity integrity.A UNIQUE constraint enforces the uniqueness of the values in a set of columns, so no duplicate valuesare entered. The unique key constraints are used to enforce entity integrity as the primary keyconstraints.A FOREIGN KEY constraint prevents any actions that would destroy links between tables with thecorresponding data values. A foreign key in one table points to a primary key in another table. Foreignkeys prevent actions that would leave rows with foreign key values when there are no primary keyswith | | By: Technical Interview Questions | | |
| | Theory of constraints link carnival | | 2007-07-27 07:50:10 | |
Saturday is Theory of Constraints link carnival day!
Each and every Tuesday I collect the top 10 breaking Theory of Constraints stories and best blog posts from across the interweb and present them here, to you, in one handy bite size piece for your reading pleasure.
Enjoy!
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| | By: learn about lean & six-sigma | | |
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