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Consider employee (e_no, e_name, e_salary, d_code), dept(d_code, d_name) and dependent (depndt_name, e_no, relation). Show the names of employees in purchase and accounts departments with at least one dependent.
SELECT e_name FROM employee, dependent, dept WHERE employee.d_code=dept.d_code AND employee.e_no=dependant.e_no AND d_name IN (‘ACCOUNTS', ‘PURCHASE') GROUP BY e_name HAVING COUNT (e_no)>=1
Define single valued and multivalued attributes. Single valued attributes: attributes with a single value for a particular entity are known as single valued attributes. Mult
What is a Database? To know what database is, we have to start from data, which is the basic building block of any DBMS. Data: Facts, figures, statistics etc. having no pa
Define the five basic operators of relational algebra? Five basic operators of relational algebra are: 1. Union (∪∪∪∪) - Selects tuples which are in either P or Q or in both
What is a dataset? A dataset is an in-memory database that is disconnected from any regular database, but has all the significant characteristics of a regular database. Dataset
A database administrator''s responsibilities and data contents
what is query processing ,query optimization and performance turring?
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How external/conceptual mapping and conceptual /internal mapping is performed
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
Problem: (a) Given the following relation: Stats(Name,Sex,Children, Occupation, Salary, Tax, Audits) Write SQL code to define the following security constraints: (i) User
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