SQL stands for structured query language. It is used to manage and access data from database.
A database may contain more than one table having unique name for each table.
SQL language have many different versions but it supports most of the commands in similar manner :-

• SELECT:- SELECT command is used to select the data from database.Syntax of SELECT command is

SELECT * FROM table_name

To select particular column from table:

SELECT column_name FROM table_name

• INSERT:- INSERT command is used to insert elements in the column of a table.
  Syntax of INSERT command is:

INSERT INTO table_name(attributes) VALUES (values)

• UPDATE:- UPDATE command is used to make changes in the table.
  Syntax of UPDATE command is :

UPDATE table_name SET column1=value1 WHERE column1=value2

• DELETE:- DELETE command is used to delete some content from the table.
  Syntax of DELETE command:
  
To delete whole content

DELETE * FROM table_name

To delete particular column from the table

DELETE FROM table_name WHERE name(attributes)= xyz(values)

• ORDER BY:- ORDER BY command is used to arrange record in ascending order automatically.
  Syntax of ORDER BY command is:
To arrange in ascending order:

SELECT column_name FROM table_name ORDER BY column_name

To arrange record in descending order:

SELECT column_name FROM table_name ORDER BY column_name DESC