“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;

Question

A cylinder of diameter 10 cm rotates concentrically inside another hollow cylinder of inner diameter 10.1 cm. Both cylinders are 20 cm long and stand with their axis vertical. The annular space is filled with oil. If a torque of 100 kg cm is required to rotate the inner cylinder at 100 rpm, determine the viscosity of oil. Ans. μ= 29.82poise

Answer 1

Question

Chapter 4, Problem 9CAT

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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