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Logical Operators
Rules of Precedence:
Order evaluated
Operator
1
All comparison operators
2
NOT
3
AND
4
OR
Example: To produce those records of salesman or president who are having salary above 15000/-
Select ename, job, sal from emp
Where job = 'SALESMAN' or job = 'PRESIDENT'
And sal>15000;
The query formulation as above is wrong for the problem statement. The correct formulation would be:
SELECT ENAME, JOB, SAL FROM EMP
WHERE (JOB = 'SALESMAN' OR JOB = 'PRESIDENT') AND SAL>15000;
want a idea for final year project
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Evaluate: a.When transactions T1 and T2 are in a deadlock, one of the transactions will eventually implement to completion and let the other one continue implementation. b.
Complete replication: It implies maintaining of a whole copy of the database at every site. Thus, the reliability & availability and performance for query response are maximized.
ALTER TABLE Command : This command is used for variation of existing structure of the table in the given situation: When a new column is to be added to the table structure.
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Explain the Recoverable Schedule A recoverable schedule is one in which for each pair of transactions Ti and Tj such that Tj reads a data item formerly written by Ti, the comm
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