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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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Variety of Colours

 Now we will discuss about different colours and how to apply them . 

As we have discussed that there are 2 colours which is COOL and WARM . 

COOL - Cool colours can be Snow , Water , Sky . In a nutshell something which calm , soothing and refreshed . 

WARM - Warm colors represents sunlight , Heat and Friendliness . In a nutshell they are Cozy , exciting and Energetic .

It is important to understand what type of Brand or Company you are building and depending on that You can decide your type of Colour . 

Example - Imagica is a brand which offers excitement on different adventurous rides , then you can use Warm Colours . 

You can use Cool Colours where there is trust , professionalism and safeness . Example Groww has cool colours which represents trust and professionalism. 

Now there is a Different Variety which is not available in Colour Wheel which is NEUTRAL Colours , it comprises of White , Brown , Grey and Black . They usually Compliments with different colours of colour wheel .  They are usually used as Backgrounds to highlight the Website .

Adding hue and Saturation to neutral Colours makes the site more appealing as only white or grey colour sometimes not attract a person . 

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