Was ist ein Trigger it?
Ein Datenbanktrigger, meist nur Trigger genannt (englisch für Auslöser), ist eine Funktion diverser Datenbankmanagementsysteme, insbesondere großer relationaler Datenbankmanagementsysteme.
Was ist ein Trigger in der Medizin?
2 Physiologie/Pathologie Als Trigger bezeichnet man einen Schlüsselreiz bzw. den Auslöser eines Körpervorgangs oder einer Erkrankung.
Was können Trigger sein?
„Triggern“ ist ein Ausdruck der Psychologie (und der Medizin) und meint einen Auslöser für einen bestimmten Vorgang. Wenn mich etwas triggert, löst etwas eine starke emotionale Reaktion aus.
What do you need to know about triggers in DBMS?
What is a Trigger in DBMS? 1 Triggers. Triggers are the SQL statements that are automatically executed when there is any change in the database. 2 Syntax. CREATE TRIGGER: These two keywords specify that a triggered block is going to be declared. 3 Example. 4 Advantages of Triggers. 5 Disadvantages of Triggers.
What is the purpose of triggers in SQL?
Triggers are the SQL statements that are automatically executed when there is any change in the database. The triggers are executed in response to certain events (INSERT, UPDATE or DELETE) in a particular table. These triggers help in maintaining the integrity of the data by changing the data of the database in a systematic fashion.
What is an example of a trigger in DML?
For example, if the student age is less than 10, don’t allow to insert the record into the table. After Trigger: – this trigger is called after once DML statement is executed. It can perform any kind of transaction. Combination of triggers: – We can have combination of row, statement, BEFORE and AFTER triggers.
Is there insert lock on student in DBMS?
There will be INSERT lock on STUDENT which is not released for trigger to select the count. Hence trigger will be waiting for the insert to complete. But the insert is waiting for the trigger to complete to proceed for the next row insertion or to complete the transaction.