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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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Disadvantage of Venture Capital

1. No confidentiality - Generally VC treat information confidential . But they refuse to sign non - disclosure agreement due to the legal ramification of doing so. 

2. Quick Liquidity - Most VC seek to realize their investment in the company in 3 to 5 years . 

3. Complex Process - It is a lengthy and complex process which needs a detailed business plan and financial projections . Until and Unless the VC are properly satisfied with business plan , whether or not it will succeed in the future , they won't exist.

4. Loss of Control - VC firms add one of their team members to the Management team , while this is usually done for ensuring the success of the business , it can also create internal problems .

5. Loss over decisions - Another big problem faced in VC funding is that one will have to give up many key decisions on how the company will process or operate.

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