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When are they useful? Justify with an example.
The temporary tables are commonly used to support specialized rollups or exact application processing needs. Unlike a permanent table, a space is not allocated to a temporary table while it is established. Space will be dynamically allocated for the table as rows are inserted. The
CREATE GLOBAL TEMPORARY
TABLE command is used to create a temporary table in Oracle.
CREATE GLOBAL TEMPORARY TABLE (
) ON COMMIT {PRESERVE|DELETE} ROWS;
Consider the two relations given below Given that A is the primary key of R, D is the primary key of S and there is a referential integrity among S.A and R.A, discuss all
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
A file manipulation command that extracts some of the records from a file is called ? A file manipulation command that extracts some of the records from a file is called SELECT
For every n-ary relationship type R where n>2, we make a new table S to represent R. We contain as foreign key attributes in s the primary keys of the relations that show the parti
Why a report generator is used ? Report generator is used for print files on paper.
You are required to program (in a high level language such as C, C++, Java) and implement a cache simulator which will have the following inputs and outputs:- INPUTS
The Database MySQL scripts cars_for_sale.sql and car_details.sql containing the data to use for this task have been supplied. To complete this task, you need to first create
In tuple relational calculus P1 → P2 is equivalent to ? A In tuple relational calculus P1→ P2 is equivalent to ¬P1 V P2. (The logical implication expression A B, meaning
Normal 0 false false false EN-US X-NONE X-NONE
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
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