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Consider the relation schemas as follows.
works (person name, company name, salary); lives (person name, street, city); located in(company name, city); managers (person name, manager name); where manager name refers to person name.
Express the following queries firstly using Relational Algebra and then using SQL.
i) Find the names of the persons who work for company 'FBC' (company name= ‘FBC').
ii) List the names of the persons who work for company ‘FBC' along with the cities they live in.
iii) Find the persons who work for company ‘FBC' with a salary of more than 10000. List the names of these persons along with the streets and cities where they live.
iv) Find the names of the persons who live and work in the same city.
v) Find the names of the persons who do not work for company ‘FBC'.
Give detail description on Transactions. - Using transactions we can group all SQL commands into a single unit. - Transaction begins with some task and finishes only when a
How to reduce data redundency
Foreign Keys and NULL Let us take the relation: DEPT DEPT ID DNAME BUDGET D1 M
Explain Relational model and their use in DBMS? Relational Model - The relational model was first introduced through E.F. Codd of the IBM Research in the year of 1970. The mode
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One-way Associations If an association is only traversed in single direction, then it is known as one-way association. It is implemented as a pointer or an attribute which con
give some example real-life situations where DBMS are most suiitabe
What are stored-procedures? And what are the advantages of using them? Stored procedures are database objects that perform a user defined operation. A stored procedure can have
What are called multilevel indices? Indices with two or more levels are known as multilevel indices.
What are the causes of bucket overflow in a hash file organization? What can be done to reduce the occurrence of bucket overflow? When a record is inserted, the bucket to that
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