What are DDL and DML

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I have heard the terms DDL and DML in reference to databases  but I don t understand what they are    What are they and how do they relate to SQL

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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

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DDL  Create Alter Drop of  Databases Tables Keys Index Views Functions Stored Procedures   DML  Insert  Delete Update Truncate of  Tables

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DDL  Data Definition Language   Create and modify the structure of database object in a database   These database object may have the Table  view  schema  indexes    etc   e g     CREATE  ALTER  DROP  TRUNCATE  COMMIT  etc    DML  Data Manipulation Language  DML statement are affect on table  So that is the basic operations we perform in a table    Basic crud operation are perform in table  These crud operation are perform by the SELECT  INSERT  UPDATE  etc    Below Commands are used in DML    INSERT  UPDATE  SELECT  DELETE  etc

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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

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DDL   Data Definition Language  any commands that provides structure and other information about your data  DML   Data Manipulation Language  there s only 3 of them  INSERT  UPDATE  DELETE   4  if you will count SELECT   INTO x tbl from tbl of MSSQL  ANSI SQL  CREATE TABLE x tbl AS SELECT   FROM tbl

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DDL stands for Data Definition Language  DDL is used for defining structure of the table such as create a table or adding a column to table and even drop and truncate table  DML stands for Data Manipulation Language  As the name suggest DML used for manipulating the data of table  There are some commands in DML such as insert and delete

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DDL  Change the schema  DML  Change the data  Seems specific to MySQL limitations  rails s source code

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DML is abbreviation of Data Manipulation Language  It is used to retrieve  store  modify  delete  insert and update data in database       Examples  SELECT  UPDATE  INSERT statements            DDL is abbreviation of Data Definition Language  It is used to create and modify the structure of database objects in database       Examples  CREATE  ALTER  DROP statements   Visit this site for more info  http   blog sqlauthority com 2008 01 15 sql-server-what-is-dml-ddl-dcl-and-tcl-introduction-and-examples

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The following is adapted from here MySQL What is DDL  DML and DCL    DDL DDL is short name of Data Definition Language  which deals with database schemas and descriptions  of how the data should reside in the database   CREATE     to create database and its objects like  table  index  views  store procedure  function and triggers   ALTER     alters the structure of the existing database  DROP     delete objects from the database  TRUNCATE     remove all records from a table  also  all spaces allocated for the records are removed  COMMENT     add comments to the data dictionary  RENAME     rename an object   DML DML is short name of Data Manipulation Language which deals with data manipulation  and includes most common SQL statements such SELECT  INSERT  UPDATE  DELETE etc  and it is used to store  modify  retrieve  delete and update data in database   SELECT     retrieve data from one or more tables  INSERT     insert data into a table  UPDATE     updates existing data within a table  DELETE     delete all records from a table  MERGE     UPSERT operation  insert or update  CALL     call a PL SQL or Java subprogram  EXPLAIN PLAN     interpretation of the data access path  LOCK TABLE     concurrency control   DCL DCL is short name of Data Control Language which includes commands such as GRANT  and mostly concerned with rights  permissions and other controls of the database system   GRANT     allow users access privileges to database  REVOKE     withdraw users access privileges given by using the GRANT command   TCL TCL is short name of Transaction Control Language which deals with transaction within a database   COMMIT     commits a transaction  ROLLBACK     rollback a transaction in case of any error occurs  SAVEPOINT     a point inside a transaction that allows rollback state to what it was at the time of the savepoint  SET TRANSACTION     specify characteristics for the transaction

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DDL is Data Definition Language  Just think you are defining the DB  So we use CREATE ALTER TRUNCATE commands  DML is after defining we are Manipulating the data  So we use SELECT INSERT  UPDATE  DELETE command   Remember DDL commands are auto-committed  You don t need to use COMMIT statements  DML  Data Manipulation Language  commands need to be commited rolled back

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In simple words   DDL Data definition language   will work on structure of data  define the data structures   DML  data manipulation language   will work on data  manipulates the data itself

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In layman terms suppose you want to build a house  what do you do   DDL i e Data Definition Language   Build from scratch Rennovate it Destroy the older one and recreate it from scratch   that is    CREATE ALTER DROP  amp  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

[sql] What are DDL and DML?

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