How can we get the number of records or rows in a table using MySQL? *

Computers and Technology

1 answer:

luda_lava [24]3 years ago

3 0

The number of records or rows in a table using MySQL can be got by using the COUNT statement.

Explanation:

To counts all of the rows in a table, whether they contain NULL values or not, use COUNT
That form of the COUNT() function basically returns the number of rows in a result set returned by a SELECT statement
The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause.
It sets the number of rows or non NULL column values.
COUNT() returns 0 if there were no matching rows.
The SQL COUNT function is an aggregate function that returns the number of rows returned by a query. You can use the COUNT function in the SELECT statement to get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc.

You might be interested in

How to get an object from a container in java.

Vinil7 [7]

If it stores any type of objects mixed, use Object as storage class. All classes inherit from Object and for primitives use their respective wrapper classes. Or just use one of the bazillion container classes that already exist.

3 0

3 years ago

Which windows command always navigates the command-line interface back to the root directory?

Pie

The answer is "cd \".

5 0

3 years ago

A ____ is a key-dependent, one-way hash function that allows only specific recipients(symmetric key holders) to access the messa

Alexxx [7]

Answer: (C) MAC

Explanation:

MAC is stand for the message authentication code and it is one of the key dependent hash function. Message authentication provide the data integrity and also the origin of data authentication.

It basically allow the specific recipients known as the holder of the symmetric key.
The message authentication code uses the CBC (Cipher block chaining) mode for constructing the MAC algorithm and it also uses the block cipher for the conjunction by using the CBC operations.

On the other hand, all the options are incorrect as they are not the key dependent hash function.

Therefore, Option (C) is correct.

7 0

3 years ago

Who developed one of the first mathematical models of a multilevel security computer system?

svp [43]

Answer:

C. Bell and LaPadula

Explanation:

The first mathematical models of multilevel security computer system was developed by Bell and Lapadula. Their full names are David Elliot Bell and Leonard J. Lapadula. Their model used to define the concept of modes of access,secure state machine and outlined the rules of access.

6 0

3 years ago

Sql is an example of a ________ category programming language. 4gl 3gl 5gl 2gl

kicyunya [14]

The answer is Fourth-generation language (4GL). Sql is an example of a 4GL category programming language. SQL is considered a Fourth-generation language (4GL), whereas Java and C++ are third-generation languages (3GLs). Fourth-generation languages are programming languages that are closer to human language than the high-level languages like Java.

8 0

4 years ago