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Let consider the given partial relation EMP. Let us make some sub-queries for them
EMPNO
ENAME
JOB
SAL
DEPTNO
7566
Nirmal
MANAGER
2975
10
7788
Kailash
ANALYST
3000
7839
Karuna
PRESIDENT
5000
20
7902
Ashwin
7905
Ashwini
4000
Example: Get the details of the people having the minimum salary.
SELECT ENAME, JOB, SAL
FROM EMP
WHERE SAL = ( SELECT MIN (SAL) FROM EMP);
Output:
From SAD to OOAD (Structured Analysis and Design (SAD) to Object Oriented Analysis and Design (OOAD). We will find here how we can map various models in SAD to different model
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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.
give me a diagram about physical or internal level
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