SQL Database

WHAT IS DATABASE AND mySQL?

1. Database is collection of data stored in such manner that it can be easily accessed.

2. So you have a database managment system which connects computer to database

3. There are two types of databse first is relational & another is nonrelational and afer this mySQL is use for non relational database

SELECT STATEMENT

USE sql_inventory;

SELECT * 
FROM products 
-- WHERE product_id = 1
ORDER BY name;

above statement tells that select the data base called sql_inventory then select all things from table called products and sort them by their name || select the products whose id is

SELECT
    name,
    quantity_in_stock,
    (quantity_in_stock+10)*(100) AS 'factor'
FROM products

above statement selects the columns named name,quantity_in_stock,and in last columned named factor it puts each value of column quantity_in_stock by performing arithmetic operations in it.

SELECT DISTINCT quantity_in_stock FROM sql_inventory.products;

above code removes duplicated

SELECT * FROM sql_inventory.products WHERE unit_price <= 3.00;

filtering of databases

SELECT name FROM sql_inventory.products WHERE quantity_in_stock=38 OR quantity_in_stock=64 OR quantity_in_stock=90 ;

SELECT name FROM sql_inventory.products WHERE quantity_in_stock IN (38,64,90) ;

IN vs OR

SQL & REGULAR EXPRESSIONS