Constraints restrict data values from "summary" of SQL and Relational Theory by C. Date
The concept of constraints in databases is a crucial one. Constraints play a significant role in ensuring the integrity of the data stored in a relational database. One essential function of constraints is to restrict the values that can be placed in certain columns of a table. This restriction helps maintain the consistency and accuracy of the data within the database. By applying constraints to specific columns, database designers can enforce rules that dictate the acceptable values for those columns. For example, a constraint may specify that a column can only contain numeric values between a certain range, or that a column must contain a unique value for each row in the table. These rules help prevent the insertion of incorrect or inconsistent data into the database. Constraints can take variou...
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