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Differentiate between a unique key and a primary key.
- By default, clustered index on column are created by primary key while nonclustered index are created by unique key.
- Primary key doesn't allow NULLs however unique key allows one NULL.
Explain Candidate Key and Super Key A super key is a set of one or more than attributes that, taken collectively, permits us to identify uniquely a tuple in the relation. Wher
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
differences between a classified catalog and a dictionary catalog
What is an Operand? The data on which the operation is to be performed is known as an Operand
You are required to implement integrity constraints within the database to enforce the following requirements: For Projects: Start date must be supplied. Start date cannot be i
Consider the relations EMP(ENO,ENAME,AGE,BASIC_SALARY) WORK_IN(ENO,DNO) DEPT(DNO,DNAME,CITY) Express the following queries in SQL (i) Find names of employees who work in a dep
What is the initial step for object-oriented designing The initial step for object-oriented designing is object modeling. Before we go into deep about object modeling first of
Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
define locking in simple language and decribed it
how to implement hyrise in C plus plus
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