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What are the time stamps associated with each data item?
W-timestamp (Q) denotes the largest time stamp if any transaction that implemented WRITE (Q) successfully.
R-timestamp (Q) denotes the largest time stamp if any transaction that implemented READ (Q) successfully.
Explain the difference between the three storage types - volatile, non volatile and stable. Ans: Volatile storage: if storage media loses data while power goes off,
Adding Redundant Associations for Efficient Access The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
Project Description: I would like to get a database of a website which has clients email name and phone number. If you are able to get information from a website, by entering
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
Super keys of a relation can have extra attributes. Candidate keys are minimal super key, i.e. such a key have no extraneous attribute. An attribute is known as extraneous if even
Discuss The difference between drop table R and delete from R. DROP TABLE command deletes all the records with the table definition. This command will automatically committed
Question : (a) Explain with the help of appropriate examples the difference between ‘Data' and ‘Information'. (b) A digital image is an array of pixels, where each pixel h
What is the purpose of storage manager? The storage manager is responsible for the following a) Interaction with the file manager b) Translation of DML commands in to low
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