DDL vs. DML: What’s the Difference?

 DDL vs. DML: What’s the Difference?

DDL and DML are two categories of SQL statements:

• DDL stands for Data Definition Language. These statements are used to define the database structure. Some examples of DDL statements are:

• CREATE - To create database objects like tables, views, indexes, etc.
• ALTER - To alter the structure of database objects. For example, adding a column to a table.
• DROP - To delete database objects.Chuwi herobook pro

• TRUNCATE - To remove all records from a table.Chuwi hi10 x

• DML stands for Data Manipulation Language. These statements are used to manipulate data stored in the database. Some examples of DML statements are:

• SELECT - To retrieve data from the database.
• INSERT - To insert new data into the database.
• UPDATE - To update existing data in the database.
• DELETE - To delete records from the database.

Key differences between DDL and DML:

• DDL changes the structure of the database, DML changes the actual data in the database.

• DDL is less frequent, DML can be very frequent.

• DDL commits automatically, DML needs to be explicitly committed.

• DDL can not be rolled back, DML can be rolled back.

• DDL locks the database, DML does not lock the database.

So in summary, DDL statements define and modify database structure, whereas DML statements manipulate the actual data in the database. Both are essential to interacting with and modifying a database.