The ratio of the number of males and females in an apartment is 14:11. If 25% of the males and 25% of the females read newspapers out of 200 persons, the percentage of the persons who don’t read newspapers is:
Total no. of persons = 200 Males = 200 x (14/25) = 112 and Females = 200 x (11/25) = 88 25% of males who read newspaper = 112 x (25/100) = 28 25% of females who read newspaper = 88 x (25/100) = 22 Therefore no. of persons who do not read newspaper = 200 - (28 + 22) = 150 Required % = 150 x (100/200) = 75%
In a relational database, a foreign key is used to:
What is the purpose of the SQL "GROUP BY" clause?
The purpose of the primary key in a database is to
Which of the following joins returns all rows from both tables, filling in NULL values for non-matching rows?
Which of the following is true about Information?
Which of the following memories has the shortest access times?
What does the term "normalization" refer to in the context of database design?
A collection of Data organized in a manner that allows access, retrieval & use of the data
What is the full form of DBMS?
Which of the following statements about ACID properties in a DBMS is incorrect?
