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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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7 Pillars to achieve logistical competency

  1. Network design - If you have temporary located warehouse you will be able to meet customer need faster , its you who decide whether to be close with supplier or customer .

2. Information Management - Use of technology making flow of information inside and outside the organisation.

3. Transportation -Cost of transportation impacts a lot , you have to chose your transportation vehicle according to the product and operational area .

4. Inventory Management - No damage ,train workers 

5. Warehouse Management - Store well your product , renting will be mostly best option 

6. Material Handling - Handling the material without wastage and spoilage .

7. Packaging - Your packaging shape dimension will lead to logistic competency .

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