Editing Database trigger (section)

==== Schema-level triggers ====

* After Creation
* Before Alter
* After Alter
* Before Drop
* After Drop
* Before Insert

The four main types of triggers are:
# Row-level trigger: This gets executed before or after ''any column value of a row'' changes.
# Column-level trigger: This gets executed before or after the ''specified column'' changes.
# For each row type: This trigger gets executed once for each row of the [[result set]] affected by an insert/update/delete.
# For each statement type: This trigger gets executed only once for the entire result set, but also fires each time the statement is executed.