+ Rdbms Interview Questions and Answers, Question1: What is RDBMS? Question2: What is normalization? Question3: What are different normalization. + Dbms+rdbms Interview Questions and Answers, Question1: What is database or database management systems (DBMS)? Question2: What is database?. In the above article, we have kept the most asked RDBMS Interview Questions with their detailed answers to it. So that you can crack the interview with ease.
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Download PDF. Add New Question. RDBMS Interview Questions and Answers will guide us here that relational database management system (RDBMS) is a. This set of RDBMS Interview Questions and Answers for freshers focuses on “ Accessing Sql from a Programming Language”. 1. Which of the. RDBMS Questions and Answers – Modification of Database This set of RDBMS Interview Questions and Answers focuses on “Modification of.
Moreover, it creates a relationship between these tables using foreign keys. Define primary key, foreign key, candidate key, super key? A primary key can be defined at column level or table level. Only one primary key per table is allowed. Foreign key: foreign key allows the values present in the referenced column only.
It allows duplicate or null values.
It can be defined as column level or table level. Candidate Key: A Candidate key is minimum super key, there is no proper subgroup of Candidate key attributes can be a super key. Super Key: A superkey is a set of attributes of a relation schema on which all attributes of the schema are partially dependent. No two rows can have the same value of super key attributes. What is a different type of indexes? Answer : A stored procedure is a named group of SQL statements that have been previously created and stored in the server database.
Stored procedures accept input parameters so that a single procedure can be used over the network by several clients using different input data. And when the procedure is modified, all clients automatically get the new version. Stored procedures reduce network traffic and improve performance. Stored procedures can be used to help ensure the integrity of the database. Question 5. What Is Trigger? Triggers are stored in and managed by the DBMS. Triggers are used to maintain the referential integrity of data by changing the data in a systematic fashion.
A trigger cannot be called or executed; the DBMS automatically fires the trigger as a result of a data modification to the associated table. Triggers can be viewed as similar to stored procedures in that both consist of procedural logic that is stored at the database level. Stored procedures, however, are not event-drive and are not attached to a specific table as triggers are.
Stored procedures are explicitly executed by invoking a CALL to the procedure while triggers are implicitly executed. In addition, triggers can also execute stored procedures. Question 6. What Is View? Answer : A simple view can be thought of as a subset of a table. It can be used for retrieving data, as well as updating or deleting rows.
Rows updated or deleted in the view are updated or deleted in the table the view was created with. It should also be noted that as data in the original table changes, so does data in the view, as views are the way to look at part of the original table. These bodies of code are called methods.
Objects that contain same types of values and the same methods are grouped together into classes.
What is an Entity? What is an Entity type? It is a collection set of entities that have same attributes. What is an Entity set? It is a collection of all entities of a particular entity type in the database.
What is an Extension of entity type? The collections of entities of a particular entity type are grouped together into an entity set.
What is Weak Entity set? An entity set may not have sufficient attributes to form a primary key, and its primary key compromises of its partial key and the primary key of its parent entity, then it is said to be Weak Entity set. What is an attribute?
It is a particular property, which describes the entity. What is a Relation Schema and a Relation? A relation Schema denoted by R A1, A2,?
A relation is defined as a set of tuples. Let r be the relation which contains set tuples t1, t2, t3, What is the degree of a Relation? It is the number of attribute of its relation schema. What is Relationship? It is an association among two or more entities. Relationship Set - The collection or set of similar relationships. Relationship Type - Relationship type defines a set of associations or a relationship set among a given set of entity types.
Degree of Relationship Type - It is the number of entity type participating. A database schema is specified by a set of definitions expressed by a special language called DDL. It specifies user views and their mappings to the conceptual schema. This language is to specify the internal schema. This language may specify the mapping between two schemas. What is Data Storage - Definition Language? The storage structures and access methods used by database system are specified by a set of definition in a special type of DDL called data storage definition language.
This language that enables user to access or manipulate data as organized by the appropriate data model. What is DML Compiler? It translates DML statements in a query language into low-level instruction that the query evaluation engine can understand.