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Constraints

NOT NULL CONSTRAINT -    Ensures that a column cannot have a null value. DEFAULT CONSTRAINT -    Provides a default value for a column when none is specified  UNIQUE CONSTRAINT -   Ensures that all values in columns are different  CHECK CONSTRAINT -   Makes sure that all values in a column satisfy certain criteria  PRIMARY KEY CONSTRAINT -   Used to uniquely identify a row in the table  FOREIGN KEY CONSTRAINT -   Used to ensure referential integrity of the data  Primary Key - is used uniquely to identify each row in a table . It can consist of one or more columns on a table . When Multiple columns are used on a table it is called composite key.  Foreign Key - Foreign key is a column or columns that references a column most often primary key of another table . The purpose of foreign key is to maintain referential integrity of the data. Pg admin  Data base - training - right click on training - query click  Always add semi colen to run the query  Int - integer  varchar - variable charact
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How to Start Research Paper from the Beginning

 Research is finding solution to a problem. Apple , Smart watches are all doing research to find out the solution and get better use of the technology. Research is solution to a problem . There is certain Procedure to follow when doing research.

Whenever you start a research you need some starting point . 

Problems can be related to theory , day to day problems , Research studies , Discussion with experts , Innovations in technology. 

Firstly write down your area of interest and try to identify 2 research problems in your area of interest.


Use the SMART approach to start any kind of research paper 

S- Specific

M-Measurable

A-Attainable

R-Relevant 

T-Time-bound 


Process of Research 


Formulating the Research Problems

Extensive review of literature 

Developing the Hypothesis 

Developing Research Design 

Determining Sample Design 

Collection of Data 

Execution of the research work

Analysis of Data 

Hypothesis testing 

Generalisation and interpretation 

Preparation of the Report

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