SQLite Index, Trigger & View - Shikshaglobe

SQLite is a relational database management system (RDBMS) contained in a C programming library. In contrast to other database management systems SQLite is not a client–server database engine. Rather it is embedded into the end program. SQLite indexes can be used to speed up the performance of search operations within a database. Indexes are created on one or more columns of a table and the data within those columns is used to order the records in the index. SQLite also supports "trigger" based indexes - where an index is automatically created and maintained when a particular action (trigger) occurs on a table. A "view" in SQLite is simply a virtual table that is populated by running a SELECT query against one or more real tables in the database. An SQLite index trigger is a database object that is triggered whenever an attempt is made to insert update or delete a row in a table that has the index. The index trigger can be used to enforce uniqueness constraints check data integrity or perform other tasks. A view is a virtual table that is populated by the results of a query. Views are useful for security purposes as they can be used to restrict access to data.SQLite is a relational database management system (RDBMS) similar to MySQL Oracle PostgreSQL and Microsoft SQL Server. Unlike these other database systems SQLite does not have a separate server process. Instead the SQLite library is linked into the application program and used directly. This makes SQLite very easy to use because there is no configuration or setup required.SQLite supports two types of triggers: row-level triggers and statement-level triggers. Row-level triggers fire once for each row that is inserted updated or deleted by the trigger event. Statement-level triggers fire once for each INSERT UPDATE or DELETE statement executed against the trigger table.Views in SQLite are virtual tables that are not stored on disk but are instead derived from other tables (or views). A view consists of a SELECT statement that is run every time the view is accessed. Views can be used to restrict access to data in a table or.

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