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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 Make Colours ?

Change your colour model to HSB in Figma 

Change the mode in fill to HSB mode and Modify your 6 variants of colour on the basis of your brand and need . 

How to choose base colour ?

Base colour is the dominant colour of the project and to choose the base colour check the brand colours first. 

List the characteristics of brand and relate it to the colour psychology 

Example KFC is a brand so its base colour would be red which is familiar to its customers.

Accent Colours - Accent colours are used for links , call to actions , progress bar etc.They are usually bright and saturated , you ca make one by choosing base colour and different colour harmonies like monochromatic , analogous etc . 

To make accent colour in figma use primary colour and increase or decrease the hue by 30 or 40 points and also increase or decrease the brightness by 5 to 10 points . 

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