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In all cases, the SQL statements running within triggers follow the common rules used for standalone SQL statements.

In particular, if an uncommitted transaction has modified values that a trigger being fired either must read (query) or write (update), then the SQL statements in the body of the trigger being fired use the following guidelines: privilege.

We can create a trigger to update the 'product_price_history' table when the price of the product is updated in the 'product' table.

1) Create the 'product' table and 'product_price_history' table Once the above update query is executed, the trigger fires and updates the 'product_price_history' table.

Like a stored procedure, a trigger is a named PL/SQL unit that is stored in the database and can be invoked repeatedly.

A trigger defined on a database fires for each event associated with all users. Compound triggers make it easier to program an approach where you want the actions you implement for the various timing points to share common data. When a trigger is fired, the tables referenced in the trigger action might be currently undergoing changes by SQL statements in other users' transactions.

SQL statements running in triggers follow the same rules that standalone SQL statements do.

Specifically: How Triggers and Constraints Differ Both triggers and constraints can constrain data input, but they differ significantly. For example, a trigger can prevent a DML statement from inserting a values that were inserted into the column before the trigger was defined or while the trigger was disabled.

Depending on what value is updated in Table A (called HNCMA. STATUS), I'd like to effect what is updated in table B (called LMD. Thanks CREATE OR REPLACE TRIGGER TR_UPDATE_STATUS AFTER UPDATE OF STATUS ON HNCMA.

AGREEMENTS_EOI FOR EACH ROW DECLARE Var Status Varchar(10); Var Status Code Int; BEGIN if :new.