DATABASE MANAGEMENT SYSTEM INTERVIEW QUESTIONS PDF
1) Define Database. A prearranged collection of figures known as data is called database. 2) What is DBMS? Database Management Systems. All students, freshers can download DBMS Basics quiz questions with answers as PDF files and eBooks. Solved examples with detailed answer description. Commonly asked DBMS interview questions | Set 1 Ans: Database management systems were developed to handle the following difficulties of typical Fille-processing Source: sppn.info /modpdf.
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DBMS Interview Questions. 1. What is database? A database is a collection of information that is organized. So that it can easily be accessed, managed, and. If you would like to view All All DBMS interview questions only, at one place, visit dbms interview questions with answers pdf, interview questions for dbms. DBMS Interview sppn.info - Download as PDF File .pdf), Text File .txt) or read online.
Eg: any person, book, etc. Entity Type is a collection of the entities which have the same attributes.
Entity Set is a collection of the entities of the same type. Eg: A collection of the employees of a firm. They include: Physical Level: This is the lowest level of the data abstraction which states how the data is stored in the database.
Logical Level: This is the next level of the data abstraction which states the type of the data and the relationship among the data that is stored in the database. Referential Integrity: This rule is related to the Foreign key which states that either the value of a Foreign key is a NULL value or it should be the primary key of any other relation.
Top 30 DBMS Interview Questions and Answers
Ans: E-R model is known as an Entity-Relationship model in the DBMS which is based on the concept of the Entities and the relationship that exists among these entities. Ans: This is basically a constraint which is useful in describing the relationship among the different attributes in a relation. This is the easiest form of the normalization process which states that the domain of an attribute should have only atomic values.
The objective of this is to remove the duplicate columns that are present in the table. Any table is said to have in the 2NF if it satisfies the following 2 conditions: A table is in the 1NF. Each non-prime attribute of a table is said to be functionally dependent in totality on the primary key.
Why DBMS Basics Interview Questions?
Any table is said to have in the 3NF if it satisfies the following 2 conditions: A table is in the 2NFm. Each non-prime attribute of a table is said to be non-transitively dependent on every key of the table. Ans: This is used with the SQL queries to fetch a specific data as per the requirements on the basis of the conditions that are put in the SQL. This is very helpful in picking the selective records from the complete set of the records.
DBMS Basics - Interview Questions and Answers
Q 24 How can you get the alternate records from the table in the SQL? Q 27 What are different types of joins in the SQL?
Left Join: This returns all the rows from the table which is on the left side of the join but only the matching rows from the table which is on the right side of the join. Right Join: This returns all the rows from the table which is on the right side of the join but only the matching rows from the table which is on the left side of the join. Full Join: This returns the rows from all the tables on which the join condition has put and the rows which do not match hold null values.
You can easily answer the interview questions based on DBMS Basics by practicing the exercises given below.
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Microbiology Biochemistry Biotechnology Biochemical Engineering. A database is a logically coherent collection of data with some inherent meaning, representing some aspect of real world and which is designed, built and populated with data for a specific purpose.
It is a collection of programs that enables user to create and maintain a database. In other words it is general-purpose software that provides the users with the processes of defining, constructing and manipulating the database for various applications.
Redundancy is controlled. A distinct recording of two tables is Union. A database object which helps in manipulating data row by row representing a result set is called cursor.
They are: Dynamic: it reflects changes while scrolling. Static: doesn't reflect changes while scrolling and works on recording of snapshot.
Keyset: data modification without reflection of new data is seen. They types of cursor are: Implicit cursor: Declared automatically as soon as the execution of SQL takes place without the awareness of the user. A query contained by a query is called Sub-query. Group-clause uses aggregate values to be derived by collecting similar data.
Functions which operate against a collection of values and returning single value is called aggregate functions 24 Define Scalar functions. Scalar function is depended on the argument given and returns sole value.
Restrictions that are applied are: Only the current database can have views. You are not liable to change any computed value in any particular view.
Full-text index definitions cannot be applied. Temporary views cannot be created. Temporary tables cannot contain views. A 'correlated subquery' is a sort of sub query but correlated subquery is reliant on another query for a value that is returned.
In case of execution, the sub query is executed first and then the correlated query. Storage and access of data from the central location in order to take some strategic decision is called Data Warehousing.
Enterprise management is used for managing the information whose framework is known as Data Warehousing. Joins help in explaining the relation between different tables.Q 8 What are the main differences between Primary key and Unique Key?
What do you mean by atomicity and aggregation? Nested Loops is executed from the inner to the outer as: A query with respect to DBMS relates to user commands that are used to interact with a data base.
Clustered indexes is the index according to which data is physically stored on disk. Jump to Page. The object itself comprises bodies of object for its operation which are called methods.
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