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Worksheet for Class 12 Computer Science Dbms And Structured Query Language
Class 12 Computer Science students should refer to the following printable worksheet in Pdf for Dbms And Structured Query Language in Class 12. This test paper with questions and answers for Class 12 will be very useful for exams and help you to score good marks
Class 12 Computer Science Worksheet for Dbms And Structured Query Language
Basic Database concepts
Data : Raw facts and figures which are useful to an organization. We cannot take decisions on the basis of data.
Information: Well processed data is called information. We can take decisions on the basis of information Field: Set of characters that represents specific data element.
Record: Collection of fields is called a record. A record can have fields of different data types.
File: Collection of similar types of records is called a file.
Table: Collection of rows and columns that contains useful data/information is called a table. A table generally refers to the passive entity which is kept in secondary storage device.
Database: Collection of logically related data along with its description is termed as database.
Relation: Relation (collection of rows and columns) generally refers to an active entity on which we can perform various operations. It is also known as table.
Tuple: A row in a relation is called a tuple. It is also known as record.
Attribute: A column in a relation is called an attribute. It is also termed as field or data item.
Degree: Number of attributes in a relation is called degree of a relation.
Cardinality: Number of tuples in a relation is called cardinality of a relation.
Primary Key: Primary key is a key that can uniquely identifies the records/tuples in a relation. This key can never be duplicated and NULL.
Foreign Key: Non key attribute of a table acting as primary key in some other table is known as Foreign Key in its current table. This key is used to enforce referential integrity in RDBMS.
Candidate Key: Attributes of a table which can serve as a primary key are called candidate keys.
Alternate Key: All the candidate keys other than the primary key of a relation are alternate keys for a relation.
DBA: Data Base Administrator is a person (manager) that is responsible for defining the data base schema, setting security features in database, ensuring proper functioning of the data bases etc.
Select Operation: The select operation selects tuples from a relation which satisfy a given condition.
It is denoted by lowercase Greek Letter σ (sigma).
Project Operation:The project operation selects columns from a relation which satisfy a given condition. It is denoted by lowercase Greek Letter π (pi). It can be thought of as picking a sub set of all available columns.
Union Operation: The union (denoted as ∪) of a collection of relations is the set of all distinct tuples in the collection. It is a binary operation that needs two relations.
Set Difference Operation: This is denoted by – (minus) and is a binary operation. It results in a set of tuples that are in one relation but not in another
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CBSE Class 12 Computer Science Dbms And Structured Query Language Worksheet
We hope students liked the above worksheet for Dbms And Structured Query Language designed as per the latest syllabus for Class 12 Computer Science released by CBSE. Students of Class 12 should download in Pdf format and practice the questions and solutions given in the above worksheet for Class 12 Computer Science on a daily basis. All the latest worksheets with answers have been developed for Computer Science by referring to the most important and regularly asked topics that the students should learn and practice to get better scores in their class tests and examinations. Studiestoday is the best portal for Class 12 students to get all the latest study material free of cost.
Worksheet for Computer Science CBSE Class 12 Dbms And Structured Query Language
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Dbms And Structured Query Language worksheet Computer Science CBSE Class 12
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Dbms And Structured Query Language CBSE Class 12 Computer Science Worksheet
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Worksheet for CBSE Computer Science Class 12 Dbms And Structured Query Language
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