SQL Constraints 101: Ensuring Data Accuracy and Integrity

Enforcing restrictions on the type of data that goes into a database table is a way to protect it from malicious attacks and have consistent data that adheres to requirements. When creating a database table, you may want to put restrictions on the type of data that gets stored in the table.

For example, when creating a table for students for a particular institution, each student is assigned a unique id, for which no other student is assigned that id. …

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