What are DDL and DML?

DDL is Data Definition Language : it is used to define data structures.

For example, with SQL, it would be instructions such as create table, alter table, ...


DML is Data Manipulation Language : it is used to manipulate data itself.

For example, with SQL, it would be instructions such as insert, update, delete, ...

4 years ago

DDL is Data Definition Language : Specification notation for defining the database schema. It works on Schema level.

DDL commands are:

create,drop,alter,rename

For example:

create table account (

  account_number  char(10),

 balance integer);

DML is Data Manipulation Language .It is used for accessing and manipulating the data.

DML commands are:

select,insert,delete,update,call

For example :

update account set balance = 1000 where account_number = 01;

4 years ago

In layman terms suppose you want to build a house, what do you do.

DDL i.e Data Definition Language

Build from scratch
Renovate it
Destroy the older one and recreate it from scratch
that is

CREATE
ALTER
DROP & CREATE
DML i.e. Data Manipulation Language

People come/go inside/from your house

SELECT
DELETE
UPDATE
TRUNCATE
DCL i.e. Data Control Language

You want to control the people what part of the house they are allowed to access and kind of access.

GRANT PERMISSION

4 years ago