MySQL mcq questions and answers | MySQL MCQs

This MySQL command is used to connect to a MySQL database. Let's break down the parts:

mysql: This is the command used to start the MySQL client.
-h xyz.host.try.net: This specifies the host name or IP address of the MySQL server.
-p: This tells the client to prompt for the password.
-u tamp: This is where we find the user name, which is tamp in this case.

Therefore, the answer is Option A: user name.

This question asks you to identify what the words 'abc' and 'xyz' represent in the given SQL statement. Let's break it down:
SQL Statement:
`CREATE TABLE abc (xyz);`
* `CREATE TABLE`: This tells MySQL we want to create a new table. * `abc`: This is the name we are giving to our new table. * `xyz`: This is the name of the column we are creating within the `abc` table.
Therefore, the correct answer is Option A: table name and column specs.

This question is about MySQL's server modes, which control how MySQL behaves. Imagine these modes as different settings you can adjust to change how your database works.

One important server mode is related to identifiers. Identifiers are names we give to things in a database, like table names, column names, or even functions.

The question asks about a server mode that prevents you from using names that are already used by built-in functions. For example, if you have a function called "SUM" (which adds numbers), you can't use "SUM" as a table name or a column name.

Let's look at the options:

A) ANSI: This mode makes MySQL follow the standards of the American National Standards Institute, which are rules for how databases should work. It's a general mode, not specifically focused on identifier names.
B) IGNORE_FUNC: This mode is exactly what we are looking for! It disables the use of built-in function names as identifiers.
C) TRADITIONAL: This mode activates a bunch of settings to make MySQL more like older versions, but it doesn't specifically address identifier names.
D) IGNORE_SPACE: This mode allows you to use spaces in your identifiers, but it's not related to the issue of built-in function names.

Therefore, the correct answer is Option B: IGNORE_FUNC

Remember, you can enable or disable server modes in MySQL. This gives you more control over how your database functions and prevents you from accidentally using names that could clash with existing functions.

This question is about how MySQL handles strings when you try to turn them into numbers.

Let's break down the options:

Option A: double precision floating point - This is a type of number that can have decimals and a very large range, like really big or really small numbers.
Option B: single precision floating point - Similar to a double precision, but has a smaller range of numbers.
Option C: decimal integer - This is a whole number, no fractions or decimals.
Option D: hexadecimal integer - This is a number system using base 16, often written with letters and numbers.

When MySQL turns a string into a number, it usually tries to make it a double precision floating point number. This means it can handle decimals and a wide range of numbers.

So the correct answer is Option A: double precision floating point.

This question is asking you about how to check if your MySQL server has a feature called query cache.
The query cache is a way to store the results of frequently used queries so that MySQL doesn't have to run them again and again, saving time and resources.
To find out if your server supports this feature, you need to look at a special variable.
Out of the options given, only "have_query_cache" is the correct variable that tells you if the query cache is enabled.
So the answer is Option A: have_query_cache.
The other options are not valid variables in MySQL.

This question asks about how many options you have to manage the LOCAL capability within MySQL at the time you're running it.

Think of it like this: LOCAL is a special feature that lets MySQL do certain things within a specific part of your system. You might want to control how this feature works while your MySQL server is running.

The question wants to know how many different ways you can control LOCAL at that moment in time.

Let's look at the options:

Option A: 0 – This means you can't control LOCAL at all during runtime. That's unlikely.
Option B: 1 – This means there's only one way to manage LOCAL while MySQL is running.
Option C: 2 – This means you have two different options to control LOCAL at runtime.
Option D: 3 – This means there are three different ways to manage LOCAL during runtime.

The correct answer will depend on how MySQL actually works. If you know MySQL's features, you can choose the answer that matches how it allows you to control LOCAL while it's running.

This question asks about the order in which MySQL processes UNION ALL and UNION DISTINCT operations.

UNION ALL combines the results of two or more queries, including all duplicate rows.

UNION DISTINCT also combines results, but it removes duplicate rows.

The question states that UNION ALL has a higher precedence than UNION DISTINCT. This means that UNION ALL is processed before UNION DISTINCT.

The correct answer is False. UNION ALL and UNION DISTINCT have the same precedence.

In simple terms, MySQL doesn't prioritize one over the other. They are treated equally.

This question asks about the number of attributes in a MySQL table. An attribute is like a column in the table, holding specific information about each row.

Let's break down the code:

     CREATE TABLE employee (
         emp_name CHAR(30),
         emp_id INT
     );

This code creates a table named "employee".

    emp_name CHAR(30) defines an attribute called emp_name (for employee name) that can store up to 30 characters.

    emp_id INT defines an attribute called emp_id (for employee ID) that stores integer values.

Since we have two attributes (emp_name and emp_id), the correct answer is Option C: 2.

This question is about how we can use one query (like a question) inside another query in MySQL. Think of it like this: Imagine you have a big question, and to answer it, you need to ask smaller questions first.

Subquerying is the correct answer. It's like asking a smaller question within a bigger question to get the information you need.

Here's why the other options are incorrect:
Nesting: While nesting is related to placing things inside each other, it's not the specific term for how queries work in MySQL.
Binding: Binding is about connecting data to variables, not about putting queries inside each other.
Encapsulating: This means to enclose something, but it doesn't describe how queries work together.
So the answer is Option C: subquerying.

This question is about CGI.pm, which is a module used in Perl programming language to create Common Gateway Interface (CGI) scripts.
CGI scripts are programs that allow web servers to interact with users and databases.
CGI.pm provides a convenient way to write CGI scripts in Perl.
Object-oriented programming (OOP) is a programming paradigm that uses objects and classes to structure code.
CGI.pm supports both procedural and object-oriented approaches.
Therefore, the answer to the question is True.
Option A is the correct answer.