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🎯 Primary Key vs Unique Key (SQL) #education #coding #sql #dataanalytics #datascience
🎯 Primary Key vs Unique Key in SQL (Interview Ready) Definition: 👉 Primary Key – Uniquely identifies each row in a table. 👉 Unique Key – Ensures all values in a column are unique. --- 🎯 Main Purpose: 👉 Primary Key = Main identity of the table 👉 Unique Key = Alternate/secondary identity --- 🔢 Number Allowed: 👉 Only ...
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