Implementation of Queue using lists in python click
Popular posts from this blog
Machine Learning
What is Machine Learning ? Machine Learning is concerned with design and development of algorithms which allows a computer to improve performance based on data. Applications of Machine Learning Gmail - Priority inbox :A sample of user defined important mails are given and machine should identify new important mails. Handwritten digit recognition Generating captions with sentiments. Autonomous robotics bioinformatics Medical diagnosis Stock market analysis Types of Machine Learning Supervised Learning : A pair of a training data and a target is given at a time. At each step, machine learns and refine a mapping form Unsupervised Learning : Only the data is given. Machine learns the structure inherited in data. Reinforcement Learning : U...
Constraints
Constraints protect the database from errors. It puts restrictions on database state. Types of Constraints in Relational Model Domain Constraint Key Constraint Entity Integrity Constraint Referential Integrity Constraint Types of Constraints that cannot be captured in relational model Semantic Constraints (Business Rules) eg : Buy one get one free Domain Constraint Value of each attribute in a tuple must be atomic (no repeating values) and consistent with its domain(data type). It could be null if allowed. Key Constraint key constraint specifies that the values in the column declared as a primary key must be unique. Types of keys Candidate Key A relation has several keys referred to as candidate keys.but one candidate key is unique. it is called the prima...
Comments
Post a Comment