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Mastering SQL Concepts

Authored by kani mozhi

Computers

University

Used 1+ times

Mastering SQL Concepts
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does SQL stand for?

Standard Query Language

Structured Query Language

Structured Query List

Simple Query Language

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which SQL command is used to retrieve data from a database?

UPDATE

SELECT

INSERT

DELETE

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of the WHERE clause in SQL?

To sort records in ascending order.

To join multiple tables together.

To filter records based on specified conditions.

To create new database tables.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Explain the difference between INNER JOIN and LEFT JOIN.

INNER JOIN fills unmatched rows with default values from the left table.

INNER JOIN returns all rows from both tables regardless of matches.

LEFT JOIN only returns rows from the right table with no NULLs.

INNER JOIN returns matched rows only; LEFT JOIN returns all rows from the left table with matched rows from the right table, filling with NULLs if no match.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a primary key in a database?

A primary key is a type of foreign key.

A primary key is an optional field in a database.

A primary key is a unique identifier for a record in a database.

A primary key can be duplicated across records.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you count the number of rows in a SQL table?

SELECT COUNT(*) FROM table_name;

COUNT(table_name);

SELECT SUM(*) FROM table_name;

SELECT ROW_COUNT(table_name);

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What SQL function would you use to find the average value of a column?

COUNT()

MAX()

SUM()

AVG()

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