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What is NULL? Simply NULL means not in value.
Describe Parameteric end users? Parametric end users might be given update access, but are commonly not permitted to change the structure of data.
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not? If relational schema R (A, B, C) has distinct val
WHAT IS DSS? WRITE ITS REQUIREMENTS.
Question: a) Discuss the concept of data independence, explaining its importance in a database environment. b) To address the issue of data independence, the ANSI-SPARC t
write a database program for concurrency transaction in a bank
What are stored and derived attributes? Stored attributes: The attributes keeps in a data base are known as stored attributes. Derived attributes: The attributes that are de
What does Aggregation mean?
what is the importance of back up files
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