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Types of SQL

1. Data Definition Language (DDL): DDL is used to define and manage the structure of the database. It includes creating, altering, and deleting tables, indexes, and other database objects.
2. Data Manipulation Language (DML): DML is used to manipulate the data stored in the database. It includes operations like inserting, updating, and deleting data records.
3. Data Query Language (DQL): DQL is used to retrieve data from the database. The most common DQL command is the SELECT statement, which fetches data based on specified conditions.
4. Data Control Language (DCL): DCL is used to control access to data within the database. It includes commands like GRANT and REVOKE, which assign and remove permissions.
5. Transaction Control Language (TCL): TCL is used to manage transactions within the database. It includes commands like COMMIT (to save changes) and ROLLBACK (to undo changes).
6. Procedural Language Extensions: Some databases offer extensions to SQL that allow for procedural programming. These include features like user-defined functions, stored procedures, and triggers.
7. Interactive SQL: This type of SQL is used for querying and updating data interactively. Users can enter SQL commands in a query tool or interface and get immediate results.
8. Embedded SQL: SQL statements can be embedded within programming languages like Java, C++, or Python to interact with the database from within the code.
9. Dynamic SQL: This allows you to create SQL statements dynamically during runtime based on certain conditions or variables.

Key Concepts of SQL

1. Tables and Databases
2. Data Types
3. Queries
4. CRUD Operations
5. Joins
6. Filtering
7. Sorting
8. Grouping and Aggregation
9. Subqueries
10. Indexes
11. Constraints
12. Transactions
13. Views
14. Stored Procedures and Functions
15. Normalization
16. Security

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