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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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Color Theory

 Today we will discuss about colour theory and how is it useful in graphic designing , UX / UI design , Fashion and Interior Designing. 

CMYK - Cyan , Magenta , Yellow and Black , this is mostly used for color printing , Graphic designers are recommended to use CMYK .

RGB - Red , Blue ,and Green and this is used for digital work. If some is UX / UI designer who want to design digital screen then RGB can be the option for you. 

RGB colors are more vibrant because they are wider than CMYK .

Division of Colours - 

1. Hue - It is the origin of color that we see , like red , blue etc .

2. Saturation - It is the intensity of hue . Taking example of Red , if intensity increases saturation (color becomes more vibrant) and if intensity decreases , saturation decreases which makes the color less vibrant.

3. Value - Keeping value in simple terms is brightness of the colour . Value can be divided into 2 parts ie Tint and Shade . 

Tint is basically a brighter version of Hue . A Tint can be made by mixing white in the colour . So for example if we have red color as hue which originally see from our eyes when mixed with White make a vibrant Red , a brighter Red which is a Tint . 

Shade - Shade is the darker version of Hue . We can make a Shade by adding Black colour into the Hue . So for example taking Hue which red and adding black colour into it which makes it darker makes a Shade.

We can also add a Tone into a Colour by adding Grey into it . 

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