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Having Clause with sub queries: First we have to recollect the GROUP BYclause. The following query searches the minimum salary in every department.
SELECT DEPTNO, MIN (SAL)
FROM.EMP
GROUP BY DEPTNO;
Output:
DEPTNO
SAL
10
2975
20
3000
Question 1 Discuss the classification of DBMS based on location of database Question 2 Explain with examples different SQL commands used for creating and deleting relations.
i am required to come up with entities relationships, optionality and cardinality from a scenario. there is a night club and bookings for a musician band
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
Saving Derived Attributes to Avoid Re-computation Data that is derived from other data should be stored in the computed form to avoid re-computation. For this, we could define
Sub query in the UPDATE command : Example : //Double the commission for employees, who have got at least 2 increments. UPDATE EMP SET COMM = COMM * 2 WHERE
Why is database design important?
What is an Operand? The data on which the operation is to be performed is known as an Operand
What are the two approaches to store relations in distributed database? a) Replication b) Fragmentation
These are designed to reduce the effects of a database failure and make sure a database is restored to a consistent state if a failure does arise. Manual backup/restore utilities n
While sorting field groups we cannot use more than one key field False.
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