Types of Attributes • Simple attribute− Simple attributes are atomic values, which cannot be divided further. For example, a student's phone number is an atomic value of 10 digits. • Composite attribute− Composite attributes are made of more than one simple attribute. For example, a student's complete name may have first_name and last_name. • Derived attribute− Derived attributes are the attributes that do not exist in the physical database, but their values are derived from other attributes present in the database. For example, average_salary in a department should not be saved directly in the database, instead it can be derived. For another example, age can be derived from data_of_birth. • Single-value attribute− Single-value attributes contain single value. For example − Social_Security_Number. • Multi-value attribute− Multi-value attributes may contain more than one values. For example, a person can have more than one phone number, email_address, etc.
A boy lost his 25% of his money. After spending 30% of the remainder, he has Rs 1260 left. What money does he had initially?
A racing car going at an average speed of 108 km/hr takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (in ...
Seven years ago, the ratio of the ages of A and B was 4: 5. Eight years hence, the ratio of the ages of A and B will be 9:10. What is the sum of their p...
The boys and girls in a college are in the ratio 3:2. If 15% of the boys and 25% of the girls are adults, then adults are approximately how much % less ...
Among the 720 employees in the office, 30% engage exclusively in playing cricket, and 40% participate in both cricket and chess. If 20% of the employees...
The marks obtained by A is 25% more than B, and the marks obtained by C is 155 more than the difference of the marks obtained by A and B. If C obtained ...
A gave 40% of amount to B. B gave 15% of amount received from A to C. If amount received by C from B is Rs.120, then find the amount received by B from A.
The only expenses of Arun are on grocery, rent and fun expenses. Arun spent Rs. 4,250 on fun, amount spent by him on rent is Rs. 9,000 more than that on...
Z spends 60% of his salary and saves the remaining. After his salary is increased by 30%, he saves 55% of the increased amount besides the amount he use...
The price of a car increased by 5% while its sales decreased by 16%. What is the percentage change in the total revenue?