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what is Lossless-join decomposition
Discuss the count function? The COUNT function used returns the number of tuples or values fixed in a query. The count function comprises two types of syntax: (1) COUNT (*)
I need to Map an E-R diagram to a relational schema
Explain the concept of generalization and aggregation in E_R diagrams. Give one example for each one of them? Generalization: Consider extending the entity set account throug
assume we have the following apllicationthat model sccer team the games they play and the players inv each teamin the design we want to capture
What is an ER diagram? Why is it used in Database management system (DBMS)?
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
The Maximum no of key fields that can be used in a header is?? 50
Database systems have many opposite efforts ?
Example : Search the name, department number and salary of employees drawing minimum salary in that department. SELECT ENAME, SAL, DEPTNO FROM EMP WHERE SAL IN (SELECT MI
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