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Describe DROP TABLE command of SQL along with both the options - CASCADE and RESTRICT.
DROP TABLE command - This command drops the specified table. Dropping a table also drops indexes and grants related with it. Objects built on dropped tables are marked invalid and cease to work.
CASCADE and RESTRICT options - The DROP TABLE with RESTRICT option destroy the table unless a few view or integrity constraint refer to the given table; if so, the command fails. Other than along with the CASCADE option, any referencing views or integrity constraints are (recursively) dropped as well.
Explain the Project-Join normal form A relation R is in PJNF along with respect to a set of functional dependencies D if for all join dependencies of the outline *(R 1 , R 2 ,
Availability: A site having the copy of a replicated relation fails, even then the relation may be found in another site. Therefore, the system may carry on to process at least th
1. Staff(staffID, firstName, lastName, availabilityID, experience, phone, mobile, email); 2. Availability(availabilityID, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday,
Hardware failure : Hardware failures are the failures when some disk or hardware chip fails. This may result in loss of data. One such trouble can be that a disk gets damaged and
Design a gennalization and specialization hierarchy for an automobile sales company
Short Note on mid Square Method of hashing? Mid square method of hashing: In the method midsquare hashing, the key is squared and the address selected from the center of the s
What is difference between TRUNCATE and DELETE? - Truncate can't be rolled back whereas Delete can be. - Truncate keeps the lock on table whereas Delete keeps the lock on ea
Describe Graphical User Interface? Graphical User Interfaces (GUIs) - A GUI typically displays a schema to the user in diagrammatic form. The user can then specify a query th
i want help to complete my task
(a) Why did SAP introduce the extended star schema?
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