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sql Interview Questions
Backbasics
What is SQL?
SQL (Structured Query Language) is a standard language for managing and manipulating relational databases. It is used for querying, updating, and managing data in databases. Common SQL commands include `SELECT`, `INSERT`, `UPDATE`, `DELETE`, `CREATE`, and `ALTER`.
What is a primary key in SQL?
A primary key is a unique identifier for records in a table. It ensures that no duplicate values exist in the column or combination of columns marked as the primary key. Each table can have only one primary key.
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