MySQL mcq questions and answers | MySQL MCQs

This question asks about a technology called CGI. It's short for something, and you need to choose the correct full form from the options.

CGI stands for Common Gateway Interface.

So the answer is Option B.

Let's break down why the other options are incorrect:

* Option A: Computer Gateway Interface - This is not the correct full form.
* Option C: Computer Generated Interface - This is not the correct full form.
* Option D: Common Generated Interface - This is not the correct full form.

CGI is a standard way for web servers to interact with external programs, which can be written in different programming languages. It's used to create dynamic web pages that are generated on the fly, based on user input or other factors.

This question is about how MySQL manages data replication. Imagine you have two MySQL servers: a master server and a slave server. The master server is the original source of data, and the slave server keeps a copy of that data.

When data changes happen on the master server (like adding new data or updating existing data), these changes are recorded in a special log called the binary log.

The slave server then reads these changes from the binary log and applies them to its own copy of the database.

So, the answer to the question is Option C: binary log.

Let's look at why the other options are incorrect:

* Option A: error log: This log records errors that occur during the operation of the MySQL server. It doesn't directly relate to replication.
* Option B: general query log: This log records all SQL queries executed on the server. It's not specifically used for replication.
* Option D: relay log: This log is used by the slave server to store the changes it receives from the master server before applying them to its database. While it's involved in replication, the changes are initially recorded in the binary log.

This question is about how MySQL handles numbers that are too big or too small for the data type they are supposed to be.
Imagine you have a box that can only hold numbers between 0 and 10. If you try to put the number 12 in the box, what happens?
MySQL doesn't automatically adjust the number to fit. It will either give you an error or store a distorted value.
So the answer is Option A: True

This question is about how MySQL's DISTINCT keyword works.
Imagine you have a table called "employee" with a column named "emp_id". This column stores employee IDs. The table has these IDs: {1, 2, 2, 3, 3, 5, 6, 7, 8, 8}.

The SQL statement `SELECT DISTINCT emp_id FROM employee;` means you want to get a list of all the unique "emp_id" values from the table. This means it will remove any duplicate IDs.

So, the correct answer is Option B: {1,2,3,5,6,7,8} because this shows only the unique employee IDs, removing the duplicate entries.

This question asks about how to view information about indexes within a table using the mysqlshow command in MySQL.

Indexes are special data structures that help speed up data retrieval in a database table. They act like an index in a book, allowing MySQL to quickly locate specific rows based on specific values.

Let's look at the options:
* Option A: -no-data This option tells mysqlshow to only show the table structure and not the actual data within the table. It's not related to viewing indexes.
* Option B: -indexes This option is specifically designed to show information about the indexes defined for a table. This is the correct answer!
* Option C: -keys This option is very similar to -indexes and also shows information about indexes. It's another correct answer.
* Option D: -flag This option is not a valid option for mysqlshow.

In summary: The options that display information about indexes in a table using mysqlshow are -indexes and -keys.

This question is asking about the data type in MySQL that is used to store single precision floating point numbers. This means numbers that can have decimal points and are not whole numbers.
Let's look at the options:
Option A: FLOAT
This is the correct answer! FLOAT is the data type used for single-precision floating point numbers in MySQL.
Option B: DOUBLE
This is the data type used for double-precision floating point numbers, which are more precise than single-precision numbers.
Option C: INT
This is the data type used for integers, which are whole numbers without decimal points.
Option D: BIGINT
This is the data type used for larger integers than INT can handle.
So, the answer is Option A: FLOAT.

Imagine you have a big box filled with smaller boxes. You want to find a specific item, but you need to open the bigger box first to see what smaller boxes are inside. Then, you need to open those smaller boxes to find your item.

This is similar to how subquerying works in MySQL. It allows you to run one query (like opening the big box) inside another query (like opening the smaller boxes) to get specific information.

So the answer to the question is Option C: subquerying.

This question is about how you use the gcc compiler to create an executable file from your code.

The gcc compiler is a powerful tool for building programs in languages like C and C++. It takes your source code and transforms it into a file that your computer can understand and run.

The question asks which option you use with gcc to tell it what to name the executable file.

Here's a breakdown of the options:

Option A: -e This option isn't used for specifying the executable name.

Option B: -o This is the correct option! The -o option is used to specify the output filename, which is your executable file. For example, gcc -o myprogram myprogram.c would compile myprogram.c and create an executable file called myprogram.

Option C: -a This option isn't used for specifying the executable name.

Option D: -b This option isn't used for specifying the executable name.

So, the answer is Option B: -o

In MySQL, the LOW_PRIORITY modifier is used to tell the database to prioritize other queries over the one with this modifier. It basically makes the query wait in line behind other queries.

Here's how it works for different SQL statements:
* DELETE: LOW_PRIORITY can be used with DELETE statements to make them wait behind other queries while deleting data.
* INSERT: LOW_PRIORITY can be used with INSERT statements to make them wait behind other queries while inserting new data.
* LOAD DATA: LOW_PRIORITY can be used with LOAD DATA statements to make them wait behind other queries while loading data from a file.
* REPLACE: LOW_PRIORITY is not supported for REPLACE statements.

So, the answer is Option C: 3 because LOW_PRIORITY applies to DELETE, INSERT, and LOAD DATA statements.

This question is about range conditions in MySQL. Range conditions help you filter data based on specific ranges of values.

Let's break down the options:

Option A: <>
This operator means "not equal to". It doesn't define a range; it simply checks if a value is different from another.

Option B: !=
Similar to option A, this operator also means "not equal to". It's another way to express not being within a specific range.

Option C: =
This operator means "equal to". It doesn't define a range either; it checks for a specific value.

Option D: >/<
This is the key! ">" means "greater than" and "<" means "less than". These operators help you define a range by specifying a minimum or maximum value.

Therefore, the correct answer is Option D: >/< because they are the operators used for range conditions in MySQL.