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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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Colour Theory

 Colour Wheel - Starting from the basics , a colour wheel comprises of Primary , Secondary and Tertiary Colours.

Primary Colours - It comprises of RED , BLUE And YELLOW . 

Secondary Colours - If we mix Primary colours together they make Secondary Colours which comprises of GREEN , ORANGE And PURPLE . 

Tertiary Colours - If we mix Primary and Secondary Colour they make Tertiary Colours . Tertiary Colours comprises of YELLOW ORANGE , RED ORANGE , RED VIOLET , BLUE VIOLET , BLUE GREEN And YELLOW GREEN .

Color Wheel is mainly divided into 2 parts which is COOL Colours and WARM Colours .


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