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PL/SQL - Triggers. In this chapter, we will discuss Triggers in PL/SQL. Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any of the following events −. A database definition (DDL) statement (CREATE, ALTER, or DROP).
Next. 39.1. Overview of Trigger Behavior #. A trigger is a specification that the database should automatically execute a particular function whenever a certain type of operation is performed. Triggers can be attached to tables (partitioned or not), views, and foreign tables.
MySQL supports triggers that are invoked in response to the INSERT, UPDATE or DELETE event. The SQL standard defines two types of triggers: row-level triggers and statement-level triggers. A row-level trigger is activated for each row that is inserted, updated, or deleted. For example, if a table has 100 rows inserted, updated, or deleted, the ...
12 de ene. de 2023 · Triggers prevent the insertion of invalid data into columns by validating input or performing corrective actions, such as logging errors or data manipulation. They facilitate cleanup operations by automatically deleting related data in other tables when specific events, like deletions, occur in the main table, minimizing errors and ensuring data consistency.
Se activará cuando una acción definida se ejecute en la tabla. El trigger puede usarse para ejecutar una de las siguientes sentencias MySQL en la tabla: INSERT, UPDATE y DELETE. Se puede invocar antes o después del evento. Puedes encontrar una explicación detallada sobre la función de los triggers y su sintaxis en este artículo.
26 de abr. de 2023 · Para deshabilitar los desencadenadores anidados, establezca la opción nested triggers de sp_configure en 0 (desactivada). La configuración predeterminada admite desencadenadores anidados. Si los desencadenadores anidados están desactivados, los desencadenadores recursivos también se deshabilitan, independientemente del valor de RECURSIVE_TRIGGERS establecido mediante ALTER DATABASE.
30 de sept. de 2020 · Our ancestors learned to make tools at least 2 million years ago to help them handle their needs. Today we have a variety of tools, including inner resources, to help us handle ours. These are some of the specific psychological and spiritual tools to help us respond, rather than react, to our own triggers. 1. Name it.
