[Solved] When joining three tables Sales, Clients, and Items with:SELECT * FROM Sales s JOIN Clients c ON s.ClientID = c.ClientID JOIN Items i ON s.ItemID = i.... | SQL

SQL - INNER JOIN

When joining three tables Sales, Clients, and Items with:

SELECT * FROM Sales s JOIN Clients c ON s.ClientID = c.ClientID JOIN Items i ON s.ItemID = i.ItemID;

How does the join engine process the row matching?

AIt matches all three tables simultaneously in one step

BIt matches rows stepwise: first Sales with Clients, then the result with Items

CIt matches Sales only with Items, ignoring Clients

DIt matches Clients with Items first, then joins Sales

Step-by-Step Solution

Solution:

Step 1: Understand join order
Joins are processed left to right unless parentheses change order.
Step 2: Apply join conditions sequentially
First, Sales join Clients on ClientID, then that result joins Items on ItemID.
Final Answer:
It matches rows stepwise: first Sales with Clients, then the result with Items -> Option B
Quick Check:
Joins are evaluated sequentially left to right [OK]

Quick Trick: Joins process tables sequentially left to right [OK]

Common Mistakes:

MISTAKES

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