“SELECT” command: The “SELECT” command is used to retrieve data in a database . Syntax for selecting values from the table is as follows: SELECT STUDENT_ID FROM STUDENT; The given query is used to display each student ID from “STUDENT” table. “COUNT” function: It is the one function of aggregate function. The “COUNT” function is used to compute the number of rows in a table. Example: The example for “COUNT” function is given below: SELECT COUNT() FROM STUDENT WHERE MARK_CREDIT >= 90; The above query is used to display the number of students whose mark credit is greater or equal to “90” by using “COUNT” function. From the given query, the asterisk () represent any column. User can also count the number of rows in a query by selecting a particular column instead of using the asterisk. The below example is as follows SELECT COUNT(STUDENT_ID) FROM STUDENT WHERE MARK_CREDIT >= 90;

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Chapter 4, Problem 14TD

Program Plan Intro

“SELECT” command:

The “SELECT” command is used to retrieve data in a database.

Syntax for selecting values from the table is as follows:

SELECT STUDENT_ID FROM STUDENT;

The given query is used to display each student ID from “STUDENT” table.

“COUNT” function:

It is the one function of aggregate function.

The “COUNT” function is used to compute the number of rows in a table.

Example:

The example for “COUNT” function is given below:

SELECT COUNT() FROM STUDENT WHERE MARK_CREDIT >= 90;

The above query is used to display the number of students whose mark credit is greater or equal to “90” by using “COUNT” function.

From the given query, the asterisk () represent any column.

User can also count the number of rows in a query by selecting a particular column instead of using the asterisk.

The below example is as follows
SELECT COUNT(STUDENT_ID) FROM STUDENT WHERE MARK_CREDIT >= 90;

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