MySQL mcq questions and answers | MySQL MCQs

This question is about data types in MySQL. TINYINT is a data type used to store small integers.
Signed means that the TINYINT can store both positive and negative values.
To figure out the minimum value, we need to understand how signed TINYINT works:
* It uses 8 bits of memory.
* One bit is used to represent the sign (positive or negative).
* The remaining 7 bits are used to store the actual number.
This means the range of values for a signed TINYINT is -128 to 127.
Therefore, the correct answer is Option B: -128.

This question is about how MySQL handles comparing a value with NULL. Remember, NULL in databases means "unknown" or "missing" value.

When you compare a known value (like a number or text) with NULL, the result is always NULL. This is because you can't really determine if an unknown value is equal to, greater than, or less than something known.

So, the correct answer is Option D: null.

This question asks about Triggers and Events in MySQL.
Let's break it down:
* Triggers are like special instructions that run automatically when something happens in a table. For example, you could have a trigger that updates a balance field whenever a new transaction is added to a banking table.
* Events are like scheduled tasks that run at specific times or intervals. You can set up an event to perform a certain action, like backing up your database, every night at 10 PM.
Now, the question asks if these triggers and events run automatically.
The answer is False. Both triggers and events are defined by you (the developer) and need to be activated by the server. They don't run on their own.
So, the correct answer is Option B: False.

This question asks about sorting data in a descending order in MySQL.

Think of sorting like arranging things from smallest to biggest or vice versa.

Descending order means arranging data from biggest to smallest.

Out of the given options, DESC is the keyword used for sorting data in descending order.

So the answer is Option A: DESC.

Let's look at the other options:

ASC is used for sorting data in ascending order (smallest to biggest).

ALTER and MODIFY are used for changing the structure of tables, not for sorting data.

This question is about how to include a "Check Constraint" directly within the definition of a data type in MySQL. Check constraints are used to ensure that data entered into a column meets specific criteria.
Let's break down the options:
Option A: ENUM
ENUM is a data type in MySQL that allows you to create a list of predefined values for a column. It does not directly support Check Constraints.
Option B: ENUM1 and Option C: ENUM2
These options are not valid data types in MySQL.
Option D: None of the mentioned
This is the correct answer. MySQL does not have a data type that directly merges a Check Constraint into its definition. You would need to create the Check Constraint separately using an `ALTER TABLE` statement.
In Summary:
MySQL does not have a data type that merges Check Constraints directly into its definition. You need to create the Check Constraint separately.

This question asks about a command-line option used with the 'mysqldump' tool in MySQL. 'mysqldump' is used to create backups of your database.

The options given are used to specify how the tables in your backup should be stored when you restore them to a new database.

We're looking for the option that lets you change the storage engine used for all the tables. Storage engines are like different ways MySQL can organize data within tables.

Of the options provided, only '-new-storage-engine' is designed to change the storage engine used for tables. It allows you to specify a new storage engine for all tables during the restoration process.

So the correct answer is Option B: -new-storage-engine.

This question is about how MySQL handles errors when you run a SQL script (a file with multiple SQL commands). Imagine you have a list of tasks to do, and some might have mistakes.
The question asks which option tells MySQL to ignore any errors and just try to run every single command in the script.
Here's a breakdown of the options:
Option A: -ensure - This option is not a valid MySQL option.
Option B: -force - This is the correct answer! The -force option tells MySQL to keep executing commands even if it encounters errors.
Option C: -violent - This is not a valid MySQL option.
Option D: -run - This is the default behavior of MySQL. It will try to run commands, but will stop if it encounters an error.
So, the answer is Option B: -force

This question is asking about how PHP interacts with web pages. PHP stands for Hypertext Preprocessor, and it's a programming language used to create dynamic web pages.
Let's break down the options:
Option A: statically generated - This means the content of the page is fixed and doesn't change. Think of a simple HTML file.
Option B: dynamically generated - This means the content of the page can change depending on various factors like user input, database information, or the time of day.
Option C: not generated - PHP doesn't create any output; this is incorrect.
Option D: no output - Similar to Option C, this is incorrect.
The correct answer is Option B: dynamically generated.
PHP is designed to produce dynamic web pages. It interacts with databases, processes user input, and can generate different content based on various conditions.
Think of PHP like a recipe for your web page. It takes ingredients (data, user input), mixes them together, and creates a final dish (the web page).

This question is about understanding the CREATE VIEW statement in MySQL.
This statement is used to create a view, which is a virtual table based on the data from another table.
In the given code, xyz is the name that is being given to the view being created.
Therefore, the correct answer is Option C: view.

This question is about how MySQL searches for information when you use a search string. Let's break it down:
Imagine you're looking for a book in a library. You could:
* Option A: Boolean mode - Think of this like using very specific search terms. You might search for "book AND author: Jane Austen". This would only find books written by Jane Austen.
* Option B: Natural language - This is like just typing in a sentence like "Find me a book about the American Revolution". MySQL will try to understand the words and find matching results.
* Option C: Query expansion - This is when MySQL adds more words to your search to help it find more relevant results. Imagine searching for "car". MySQL might automatically add words like "vehicles", "automobiles", or "trucks" to broaden your search.
* Option D: Cross mode - This is not a standard search mode in MySQL.
The answer is Option B: Natural language.
This mode allows you to search for information in a more natural, conversational way, just like you would speak to someone.