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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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Disadvantages of Trade Barriers

 Disadvantages 

1. World Trade - Export will also stop. If export is affected , foreign currency will also decrease and export generate employment opportunities . If restricting import , export of our country will also decrease.

2. Effect on Consumer Welfare - Putting barriers will affect production , when putting restriction , domestic producers will become inefficient and lethargic and quality will not improve . Charges of product will be higher . Before 1991 , India was all about domestic producer due to which consumer will deprive from good quality product.

3. Corruption and Red tapism - It will increase corruption , bribe to hold commodity and get license by bribing . Tariff barrier is declining and non tariff barrier is rising .

4. Competition in Market Decrease - It will affect consumer and economic growth of country 

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