Understanding SQL Joins

Understanding SQL Joins

12th Grade

10 Qs

quiz-placeholder

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Understanding SQL Joins

Understanding SQL Joins

Assessment

Quiz

Information Technology (IT)

12th Grade

Practice Problem

Medium

Created by

Siva rama krishnam raju V

Used 1+ times

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the primary purpose of an inner join?

To retrieve matching records from two or more tables.

To combine all records from two tables regardless of matches.

To update records in both tables based on a condition.

To delete records from one of the tables.

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How does an outer join differ from an inner join?

An inner join includes unmatched rows from one table.

An outer join is faster than an inner join.

An outer join only includes matched rows from both tables.

An outer join includes unmatched rows from one or both tables, while an inner join only includes matched rows.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of join returns all records from both tables?

Left Join

Inner Join

Full Outer Join

Right Join

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a cross join, what is the result of combining two tables?

The result is a filtered subset of the first table.

The result is a Cartesian product of the two tables.

The result is a single table with only matching rows.

The result is a summary table with aggregated data.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is a self join and when would you use it?

A self join is used to combine two different tables.

A self join is only applicable to hierarchical data structures.

A self join is a type of outer join that includes all records from both tables.

A self join is used to join a table to itself to compare rows within the same table.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What are join conditions and why are they important?

Join conditions are criteria for sorting records in SQL.

Join conditions are only necessary for inner joins.

Join conditions are used to filter data within a single table.

Join conditions are criteria for matching records from different tables in SQL.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How can join performance be affected by indexing?

Indexing has no impact on join performance whatsoever.

Indexing improves join performance by enabling faster row lookups and reducing full table scans.

Indexing only benefits single table queries, not joins.

Indexing slows down join performance by increasing data retrieval time.

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