SQL ALTER TABLE : ADD, DROP, MODIFY, RENAME - Shiksha Online
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SQL ALTER TABLE : ADD, DROP, MODIFY, RENAME - Shiksha Online
ALTER TABLE in SQL is used to change the structure of the existing table. In this article, we will briefly discuss how to add, modify, drop, rename columns, constraints, and data type in a table.
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💡 SQL Interview Question: 👉 How do you add a PRIMARY KEY constraint to an existing table in SQL? This is a frequently asked SQL interview question to test your understanding of constraints and table modification. Here’s the clean SQL query 👇 ALTER TABLE employees ADD CONSTRAINT pk_employees PRIMARY KEY (employee_id); 🎯 Explanation: ALTER TABLE is used to modify an existing table ADD CONSTRAINT defines a new table constraint pk_employees is the name of the primary key constraint employee_id b
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