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The CREATE TRIGGER statement is used to add triggers to the database schema.
Triggers are database operations that are automatically performed when a specified database event occurs.
For Example: The price of a product changes constantly.
It is important to maintain the history of the prices of the products.
And it’s pretty unanimous – from luminaries like Tom “Triggers are evil” Kyte to people like this dude (“Triggers are powerful – and much despised”). To answer your question, let me start by quoting myself again: Simple triggers to populate primary key columns from sequences are pretty uncontroversial; however, there is no upper limit to their potential complexity.
Well, I dare you to walk into a room full of Oracle experts wearing an I ♥ DATABASE TRIGGERS t-shirt. Database triggers are the Oracle feature that developers love to hate, perhaps above every other.
to allow inserting and updating exactly the desired data.
If the software must support multiple database backends or versions, perhaps the generic, standard queries are the best bet.Both the WHEN clause and the trigger actions may access elements of the row being inserted, deleted or updated using references of the form "NEW.column-name" and "OLD.column-name", where column-name is the name of a column from the table that the trigger is associated with.OLD and NEW references may only be used in triggers on events for which they are relevant, as follows: If a WHEN clause is supplied, the SQL statements specified are only executed if the WHEN clause is true.Any data that violates any unique index will cause the same problem. For example, I might export some data to a spreadsheet, send it to a client, and the client might update or add some data and return the spreadsheet to me.That’s a terrible way to update data, but for various reasons, I’m sure many readers have found themselves in a similar situation.
We can create a trigger to update the 'product_price_history' table when the price of the product is updated in the 'product' table.