Mastering Data Manipulation Language (DML): Essential Commands and Practical Applications in DBMS

The DBMS provides data manipulation language (DML) that enables users to retrieve and manipulate the data. The statement that is used to retrieve the information is called a query. The part of the DML used to retrieve the information is called a query language. The DML are of two types, namely, non-procedural DML and procedural DML. The non-procedural or high-level or declarative DML requires a user to specify what data are required without specifying how to retrieve the required data. For example, SQL (Structured Query Language) is a non-procedural query language. The procedural or low-level DML requires the user to specify what data are required and how to access that data by providing a step-by-step procedure. For example, relational algebra is a procedural query language.

Here are some tasks that come under DML:

• Select: It is used to retrieve data from a database.
• Insert: It is used to insert data into a table.
• Update: It is used to update existing data within a table.
• Delete: It is used to delete all records from a table.
• Merge: It performs UPSERT operation, i.e., insert or update operations.
• Call: It is used to call a structured query language or a Java subprogram.
• Explain Plan: It has the parameter of explaining data.
• Lock Table: It controls concurrency.