👉 How to Get Common Records from Two Tables in SQL Server | INTERSECT Tutorial
🔥 SQL Server INTERSECT Explained | Find Common Records Easily 🔥
In this video, we learn how to fetch common records from two tables using the powerful INTERSECT operator in Microsoft SQL Server 💻
📌 What is INTERSECT?
INTERSECT is a set operator in SQL that returns only the rows that are present in both result sets.
Think of it like the common part of two lists 🤝
🧠 Syntax Used in This Video:
SELECT EmployeeID, Name FROM Table1 INTERSECT SELECT EmployeeID, Name FROM Table2;
⚙️ How It Works (Step-by-Step):
👉 Step 1: First query selects data from Table1
👉 Step 2: Second query selects data from Table2
👉 Step 3: INTERSECT compares both results
👉 Step 4: Only matching rows (all column values must match) are returned ✅
📊 Important Rules to Remember:
✔️ Both SELECT statements must have the same number of columns
✔️ Column data types must be compatible
✔️ Order of columns should be the same
✔️ Automatically removes duplicate rows 🚫
💡 Example:
Table1:
EmployeeIDName1A2B3C
Table2:
EmployeeIDName2B3C4D
✅ Result after INTERSECT:
EmployeeIDName2B3C
🚀 Why Use INTERSECT?
✨ Clean and readable syntax
✨ No need for joins
✨ Perfect for comparing datasets
✨ Ensures exact match across columns
⚠️ When NOT to Use INTERSECT:
❌ When you need partial matching (use JOIN instead)
❌ When column structures differ
❌ When performance tuning requires more control
🎯 Use Cases:
🔹 Finding common employees in two departments
🔹 Comparing backup vs live data
🔹 Data validation and auditing
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