Compare and contrast data manipulation and definition language and provide an example and statement from each category
Compare and contrast data manipulation and definition language and provide an example and statement from each category
Prerequisite – DDL, DQL, DML, DCL, and TCL Commands DDL is Data Definition Language that is used to define data structures. For example: create table, alter table are instructions in SQL. DML is Data Manipulation Language that is used to manipulate data itself. For example: insert, update, and delete are instructions in SQL.
The difference between DDL and DML:
DDLDMLIt stands for Data Definition Language.It stands for Data Manipulation Language.It is used to create database schema and can be used to define some constraints as well.It is used to add, retrieve or update the data.It basically defines the column (Attributes) of the table.It add or updates the row of the table. These rows are called tuple.It doesn’t have any further classification.It is further classified into Procedural and Non-Procedural DML.Basic command present in DDL are CREATE, DROP, RENAME, ALTER etc.BASIC command present in DML are UPDATE, INSERT, MERGE etc.DDL does not use WHERE clause in its statement.While DML uses WHERE clause in its statement.DDL is used to define the structure of a database.DML is used to manipulate the data within the database.DDL is used to create and modify database objects like tables, indexes, views, and constraints.DML is used to perform operations on the data within those database objects.DDL statements are typically executed less frequently than DML statements.DML statements are frequently executed to manipulate and query data.DDL statements are typically executed by database administrators.DML statements are typically executed by application developers or end-users.DDL statements are not used to manipulate data directly.DML statements are used to manipulate data directly.DDL statements do not change the contents of the database.DML statements change the contents of the database.Examples of DDL commands: CREATE TABLE, ALTER TABLE, DROP TABLE, TRUNCATE TABLE, and RENAME TABLE.Examples of DML commands: SELECT, INSERT, UPDATE, DELETE, and MERGE.
