Solution:Step 1: Understand LEFT JOINLEFT JOIN returns all rows from the left table (Invoices) and matching rows from the right (Clients).Step 2: Analyze unmatched rowsIf no matching client exists, client columns are NULL.Final Answer:All invoices with client names where available, NULL if no client

[Solved] Consider tables:Invoices(InvoiceID, ClientID)Clients(ClientID, ClientName)What will this query return?SELECT i.InvoiceID, c.ClientName FROM Invoices i LEFT JOIN Clients c ON i.ClientID = c.ClientID; | SQL

SQL - INNER JOIN

Consider tables:
Invoices(InvoiceID, ClientID)
Clients(ClientID, ClientName)
What will this query return?

SELECT i.InvoiceID, c.ClientName FROM Invoices i LEFT JOIN Clients c ON i.ClientID = c.ClientID;

AAll invoices with client names where available, NULL if no client matches

BOnly invoices with matching clients

CAll clients with their invoices, NULL if no invoice exists

DAll invoices and clients combined without condition

Step-by-Step Solution

Solution:

Step 1: Understand LEFT JOIN
LEFT JOIN returns all rows from the left table (Invoices) and matching rows from the right (Clients).
Step 2: Analyze unmatched rows
If no matching client exists, client columns are NULL.
Final Answer:
All invoices with client names where available, NULL if no client matches -> Option A
Quick Check:
LEFT JOIN keeps all left rows, fills NULL for no match [OK]

Quick Trick: LEFT JOIN keeps all left table rows [OK]

Common Mistakes:

MISTAKES

Confusing LEFT JOIN with INNER JOIN
Expecting all clients regardless of invoices
Assuming NULLs never appear

Master "INNER JOIN" in SQL

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More SQL Quizzes

Consider tables:

Step 1: Understand LEFT JOIN

Step 2: Analyze unmatched rows

Final Answer:

Quick Check:

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