Category: SQL

SQL CREATE VIEW statement is used to create a virtual table that is based on the result set of a SELECT statement. A view does not store any data of its own; instead, it references data from one or more tables in the database. Views are used to simplify complex queries and to provide a…(Continue Reading)

SQL triggers are special types of stored procedures that are automatically executed in response to specific events or actions that occur in a database. Triggers can be defined to execute in response to events such as inserts, updates, or deletes on tables, and can be used to enforce data integrity constraints, perform complex data validation,…(Continue Reading)

SQL indexes are data structures that allow for efficient retrieval of data from a database. They are used to speed up queries and improve database performance by reducing the amount of data that needs to be scanned to find the desired information. Indexes are created on one or more columns in a table, and they…(Continue Reading)

SQL views are virtual tables that are created using a SELECT statement in SQL. A view is a database object that acts as a filter to the data stored in one or more tables. It is a logical representation of data in a database that can be used to simplify the complexity of data and…(Continue Reading)

The SQL DROP statement is used to delete or remove database objects such as tables, views, indexes, stored procedures, functions, and triggers from a database. The syntax for the DROP statement is relatively simple and straightforward, but it is important to exercise caution when using this statement because it permanently deletes the specified database objects.…(Continue Reading)

The SQL ALTER statement is used to modify the structure of existing database objects such as tables, views, procedures, functions, and triggers. The ALTER statement allows you to change the properties of an existing object without having to drop and recreate it. Syntax The syntax for the ALTER statement varies depending on the type of…(Continue Reading)

The SQL CREATE statement is used to create a new table, view, index, or other object in a database. It is one of the most fundamental and widely used SQL commands, and it allows database administrators and developers to define the structure and properties of database objects. Syntax The syntax for the CREATE statement is…(Continue Reading)

In SQL, a ROLLBACK statement is used to undo a transaction that is currently in progress. When a transaction is started, SQL begins keeping track of all the changes made to the database during that transaction. If at any point during the transaction an error occurs or if the user decides to cancel the transaction,…(Continue Reading)

In SQL language, the COMMIT statement is used to permanently save changes made to the database since the last COMMIT or ROLLBACK statement was executed. Syntax The syntax for the SQL COMMIT statement is as follows: COMMIT; The COMMIT statement is used in conjunction with the transaction management commands, which allow you to group multiple…(Continue Reading)

SQL language is used to manage and manipulate data stored in relational databases. SQL statements are commands that are used to interact with a database, and they can be used to perform a wide range of tasks, from querying and updating data to creating and deleting tables. There are different types of SQL statements that…(Continue Reading)