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Suppose you have a trigger that is called on an INSERT to a certain table. If your trigger is using the BEFORE option, the code within the trigger will be executed before the INSERT into the table occurs. A common use of the BEFORE trigger is to verify the input values of the INSERT, or modify the values accordingly.
BEFORE INSERT triggers allow the modification of the values that shall be inserted into the table. AFTER INSERT triggers cannot modify the data anymore, but can be used to initiate actions on other tables, for example, to implement auditing mechanism.
In relational databases, the log trigger or history trigger is a mechanism for automatic recording of information about changes inserting or/and updating or/and deleting rows in a database table. It is a particular technique for change data capturing, and in data warehousing for dealing with slowly changing dimensions.
A 16-year-old New Mexico boy was arrested Saturday morning after he allegedly gunned down his parents and teenage siblings and then drunkenly called 911 to confess to the quadruple homicide ...
Change data capture both increases in complexity and reduces in value if the source system saves metadata changes when the data itself is not modified. For example, some Data models track the user who last looked at but did not change the data in the same structure as the data. This results in noise in the Change Data Capture.
A new study suggests that intermittent fasting is more effective than calorie-counting for weight loss and belly fat burn. A dietitian explains how to start.
Natalie Rupnow, who also went by Samantha, shot and killed a teacher and a student and wounded six others during study hall on Monday at Abundant Life Christian School in Madison, Wisconsin ...
Transaction Logic is an extension of predicate logic that accounts in a clean and declarative way for the phenomenon of state changes in logic programs and databases.This extension adds connectives specifically designed for combining simple actions into complex transactions and for providing control over their execution.