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A super key is an attribute or set of attributes used to recognize the records uniquely in a relation.
For instance, in the Relation PERSON defines earlier PERSON_ID is a super key since PERSON_ID is unique for every person. Likewise (PERSON_ID, AGE) and (PERSON_ID, NAME) are also super keys of the relation PERSON as their combination is also unique for each record.
East Coast Aquarium Relational Database
what is lossless & dependency preserving decomposition ?
statical data
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
i am not clear with the climetic condition of the north indian plain. can u plz explain it for me
Multiple column Queries: Syntax: SELECT COLUMN1, COL2,...... FROM TABLE WHERE (COLUMN1, COL2, ...) IN (SELECT COLUMN1, COL2,.... FROM TABLE WHERE );
What are the different kinds of database end users? Discuss the major activities of each? End-Users - End-users are the people whose jobs need access to the database for que
What is an Operand? The data on which the operation is to be performed is known as an Operand
1. A company wants a report containing a breakdown of payroll by department. Input, which should be stored in 3 parallel arrays, includes each employee's department number, hourly
Hello.I have database access assignment which consist of creation Form, Subform, Calculation, Macros
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