DML Full Form is “Data Manipulation Language.” It is a subset of the SQL (Structured Query Language) used for manipulating and modifying data within a database.
DML consists of various commands, including
- Select
- Insert
- Update
- Delete
Understanding the basic concepts of DML and its commands is important when working with databases. In the world of databases, managing and manipulating data is an important aspect. This is where DML (Data Manipulation Language) is helpful for us.
In this blog, we will explain What Is DML, its importance, and its various commands with examples. So, let’s first understand What is DML?
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What is DML (Data Manipulation Language)?
So basically, we use DML (DML full form: Data Manipulation Language) to interact with a database. Also to make changes to the data it holds. It’s like having a conversation with the database. It will make the changes in the data accordingly.
SQL is a popular language for working with databases because of table format and built-in functions for data manipulation. However, there are cases when complex data relationships require more advanced tools, and that’s where Data Manipulation Language comes in handy.
Understanding Data Manipulation Language is essential for anyone working with databases, as it allows them to manipulate and manage data effectively. By utilizing DML commands appropriately, users can ensure the accuracy, consistency, and integrity of the data within a database.
Executing DML statements requires transaction control. Every change made to a database through an update or deletion is considered a transaction. To handle these changes, Transaction Control Language (TCL) statements are used. TCL manages the modifications made by DML statements, ensuring data integrity and consistency.
| Also Read : SQL Interview Questions |
Types Of DML (Data Manipulation Language)
There Are Two Types Of DML:
1. Non-procedural DML
- The most commonly used type of DML is Non-procedural DML.
- It allows users to specify the desired data without specifying the exact steps or procedures to retrieve it.
- Users can focus on stating their requirements, and the database system handles the implementation details.
- It makes interacting with the database much easier.
- Non-procedural DML makes it easier for users to retrieve data. User doesn’t need to worry about the underlying procedures.
- Users can concentrate on what they need; rather than how to get it.
2. Procedural DML
- Procedural DML allows users to specify both the data they need and the specific steps or procedures to retrieve it.
- Users have more control and can define a series of operations to manipulate the data according to their specific requirements.
- It is useful for complex data manipulation tasks that require precise control over the sequence of operations.
- Procedural DML gives users the ability to define custom procedures or scripts to perform advanced data manipulations.
- Users can specify the order of operations and customize the logic to suit their specific needs.
- It provides a higher level of flexibility and control compared to non-procedural DML.
- Procedural DML is less commonly used compared to non-procedural DML but is valuable for more complex scenarios.
DML (Data Manipulation Language) Commands
DML provides several commands for different data manipulation tasks.
Let’s explore the most common commands used in more detail:
SELECT
We can retrieve data from (one or more) database(s) tables using the “SELECT” command. It allows you to specify the desired columns and apply filters to obtain the information you need.
Syntax :-
For Example:
INSERT
To add new records (entries) to a database table (one at a time), we utilize the “INSERT” command. It allows you to enter data values for each field in the table, thereby creating new database entries.
Syntax:
For Example:
UPDATE
The UPDATE command is used to modify existing data in a database table. It enables you to change specific values within one or more rows, ensuring that the data reflects any updates or corrections required.
Syntax:
For Example:
DELETE
The DELETE command allows you to remove specific records from a database table. It helps in eliminating unwanted or outdated data, ensuring the database remains clean and efficient.
Syntax:
For Example:
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Advantages Of DML (Data Manipulation Language)
- DML provides an easy way to modify and retrieve data in a database.
- It allows for custom procedures and scripts, enabling complex data manipulations.
- DML ensures data consistency and enforces constraints to prevent invalid modifications.
- DML statements are executed as transactions, ensuring all changes are committed or rolled back.
- It can be automated to perform routine data manipulation tasks, saving time.
- DML statements can be optimized for efficient data retrieval and manipulation.
- DML maintains referential integrity across tables, keeping related data consistent.
Disadvantages Of DML (Data Manipulation Language)
- Limited control over complex business rules
- Risk of data inconsistency and errors
- Performance impact with large data manipulations
- Potential for unintended data loss or modification
- Complex transaction management
- Security vulnerabilities and unauthorized access risks
- Potential for human errors during data manipulation operations
FAQ’S
What are the 4 commands of DML?
- Select
- Insert
- Update
- Delete
What is the difference Between DDL and DML?
- DDL is used to define and modify the database structure.
- DML is used to manipulate the data within the database.
Why is DDL faster than DML?
DDL is faster than DML because it involves simpler operations on database structures, while DML deals with complex data manipulations.
Is it truncated DDL or DML?
Truncate is considered a DDL (Data Definition Language) statement.
Which Institute is Best For SQL Training In Pune?
Technogeeks is the best place to learn SQL. You will learn SQL sub-languages like DDL, DML, TCL, etc.
Technogeeks working IT professionals will give you the SQL training you need to become a database professional. This course is also useful for advanced engineers who need to refresh their skills. This SQL course is not just for engineers; it’s also for business analysts who need to gain crucial insight into new trends.
Conclusion
In this blog post, we explored the fundamentals of DML, its importance, and its various commands. Hopefully, this blog has helped you grasp the concept of DML and its practical usage in database operations. It is important to use DML commands wisely to maintain the accuracy and relevance of your database.
Any Query Regarding DML Please Mentioned In The Comment Section.
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