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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 - ...
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Gradient Colours

 Gradients - Is a gradual transition from one colour to another to add character and persolanity to design 

4 types of Gradients - 

1. Linear - popular

2. Radio

3. Angular 

4. Diamond 

You can make one by going to a website called coolors.co 

Create a Gradient button 

In a slider there are 2 colours and now make them identical by using the same colour code on both the sides .

Now you can shift the slider of colour to right or left to make analogous . 

Use ANALOGOUS COLOUR HARMONY to make the best colour gradient.


CONTRAST - 

AA For minimum Contrast . 4.5 TO 1 , 3 TO 1 - BOLD 

AAA For ENHANCED CONTRAST . 7 TO 1 , 4.5 TO 1 - BOLD 


How to measure ?

Online checkers called coolors 

Chek contrast checker 


TOOLS FOR ACCESSIBILITY -

1. STARK - Figma , sketch and adobe - color contrast ratio 

2. CONTRAST - Its a figma plug in that checks contrast ratio unlike stark with 3 times for free , but this one is unlimited 

3. WHO CAN USE - It shows how colour combination can affect various visual impaired people.


DRIBBLE , MUZLI AND COLOUR HUNT ARE GOOD OPTIONS FOR COLOUR INSPIRATION . 


TOOLS FOR MAKING COLOUR PALETTE CREATION 

1. COOLORS - Used to fine colour combinations , click on generate to generate a colour palette .now each colour lock them and make a colour palette. then export to use it in your design. Luminance option for grayscale mode. You can use image also to make a colour palette .

2. MYCOLOR.SPACE - It gives all colours you need based on primary colour , so click on colour you want and generate 

3. COLOR.ADOBE - Its an advanced tool which helps you create different colour harmonies and adjust them on the colour picker , explore them and countless colour palette , trend section gives different trend colours in different fields . 

4. KHROMA - It uses AI to create personalised colour palette  . choose 50 favorite colours and start training button and there will be 100 variety of colour palette. 


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