SQL Primary & Composite Keys: Complete SQL Tutorial with Live Examples 🔑
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SQL Primary & Composite Keys: Complete SQL Tutorial with Live Examples 🔑
SQL Constraints - Primary Key | Composite Key 🔑 Learn the fundamentals of database keys! A primary key is a unique identifier that ensures each row in a table can be distinctly identified - no duplicates allowed and never null. A composite key combines multiple columns to create a unique identifier when a single column isn't enough. In this ...
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