## 39.2. Event Trigger Firing Matrix

Table 39.1 lists all commands for which event triggers are supported.

Table 39.1. Event Trigger Support by Command Tag

Command Tag | `ddl_​command_​start` | `ddl_​command_​end` | `sql_​drop` | `table_​rewrite` | Notes
--- | --- | --- | --- | --- | ---
`ALTER AGGREGATE` | `X` | `X` | `-` | `-` |
`ALTER COLLATION` | `X` | `X` | `-` | `-` |
`ALTER CONVERSION` | `X` | `X` | `-` | `-` |
`ALTER DOMAIN` | `X` | `X` | `-` | `-` |
`ALTER DEFAULT PRIVILEGES` | `X` | `X` | `-` | `-` |
`ALTER EXTENSION` | `X` | `X` | `-` | `-` |
`ALTER FOREIGN DATA WRAPPER` | `X` | `X` | `-` | `-` |
`ALTER FOREIGN TABLE` | `X` | `X` | `X` | `-` |
`ALTER FUNCTION` | `X` | `X` | `-` | `-` |
`ALTER LANGUAGE` | `X` | `X` | `-` | `-` |
`ALTER LARGE OBJECT` | `X` | `X` | `-` | `-` |
`ALTER MATERIALIZED VIEW` | `X` | `X` | `-` | `-` |
`ALTER OPERATOR` | `X` | `X` | `-` | `-` |
`ALTER OPERATOR CLASS` | `X` | `X` | `-` | `-` |
`ALTER OPERATOR FAMILY` | `X` | `X` | `-` | `-` |
`ALTER POLICY` | `X` | `X` | `-` | `-` |
`ALTER PROCEDURE` | `X` | `X` | `-` | `-` |
`ALTER PUBLICATION` | `X` | `X` | `-` | `-` |
`ALTER ROUTINE` | `X` | `X` | `-` | `-` |
`ALTER SCHEMA` | `X` | `X` | `-` | `-` |
`ALTER SEQUENCE` | `X` | `X` | `-` | `-` |
`ALTER SERVER` | `X` | `X` | `-` | `-` |
`ALTER STATISTICS` | `X` | `X` | `-` | `-` |
`ALTER SUBSCRIPTION` | `X` | `X` | `-` | `-` |
`ALTER TABLE` | `X` | `X` | `X` | `X` |
`ALTER TEXT SEARCH CONFIGURATION` | `X` | `X` | `-` | `-` |
`ALTER TEXT SEARCH DICTIONARY` | `X` | `X` | `-` | `-` |
`ALTER TEXT SEARCH PARSER` | `X` | `X` | `-` | `-` |
`ALTER TEXT SEARCH TEMPLATE` | `X` | `X` | `-` | `-` |
`ALTER TRIGGER` | `X` | `X` | `-` | `-` |
`ALTER TYPE` | `X` | `X` | `-` | `X` |
`ALTER USER MAPPING` | `X` | `X` | `-` | `-` |
`ALTER VIEW` | `X` | `X` | `-` | `-` |
`COMMENT` | `X` | `X` | `-` | `-` | Only for local objects
`CREATE ACCESS METHOD` | `X` | `X` | `-` | `-` |
`CREATE AGGREGATE` | `X` | `X` | `-` | `-` |
`CREATE CAST` | `X` | `X` | `-` | `-` |
`CREATE COLLATION` | `X` | `X` | `-` | `-` |
`CREATE CONVERSION` | `X` | `X` | `-` | `-` |
`CREATE DOMAIN` | `X` | `X` | `-` | `-` |
`CREATE EXTENSION` | `X` | `X` | `-` | `-` |
`CREATE FOREIGN DATA WRAPPER` | `X` | `X` | `-` | `-` |
`CREATE FOREIGN TABLE` | `X` | `X` | `-` | `-` |
`CREATE FUNCTION` | `X` | `X` | `-` | `-` |
`CREATE INDEX` | `X` | `X` | `-` | `-` |
`CREATE LANGUAGE` | `X` | `X` | `-` | `-` |
`CREATE MATERIALIZED VIEW` | `X` | `X` | `-` | `-` |
`CREATE OPERATOR` | `X` | `X` | `-` | `-` |
`CREATE OPERATOR CLASS` | `X` | `X` | `-` | `-` |
`CREATE OPERATOR FAMILY` | `X` | `X` | `-` | `-` |
`CREATE POLICY` | `X` | `X` | `-` | `-` |
`CREATE PROCEDURE` | `X` | `X` | `-` | `-` |
`CREATE PUBLICATION` | `X` | `X` | `-` | `-` |
`CREATE RULE` | `X` | `X` | `-` | `-` |
`CREATE SCHEMA` | `X` | `X` | `-` | `-` |
`CREATE SEQUENCE` | `X` | `X` | `-` | `-` |
`CREATE SERVER` | `X` | `X` | `-` | `-` |
`CREATE STATISTICS` | `X` | `X` | `-` | `-` |
`CREATE SUBSCRIPTION` | `X` | `X` | `-` | `-` |
`CREATE TABLE` | `X` | `X` | `-` | `-` |
`CREATE TABLE AS` | `X` | `X` | `-` | `-` |
`CREATE TEXT SEARCH CONFIGURATION` | `X` | `X` | `-` | `-` |
`CREATE TEXT SEARCH DICTIONARY` | `X` | `X` | `-` | `-` |
`CREATE TEXT SEARCH PARSER` | `X` | `X` | `-` | `-` |
`CREATE TEXT SEARCH TEMPLATE` | `X` | `X` | `-` | `-` |
`CREATE TRIGGER` | `X` | `X` | `-` | `-` |
`CREATE TYPE` | `X` | `X` | `-` | `-` |
`CREATE USER MAPPING` | `X` | `X` | `-` | `-` |
`CREATE VIEW` | `X` | `X` | `-` | `-` |
`DROP ACCESS METHOD` | `X` | `X` | `X` | `-` |
`DROP AGGREGATE` | `X` | `X` | `X` | `-` |
`DROP CAST` | `X` | `X` | `X` | `-` |
`DROP COLLATION` | `X` | `X` | `X` | `-` |
`DROP CONVERSION` | `X` | `X` | `X` | `-` |
`DROP DOMAIN` | `X` | `X` | `X` | `-` |
`DROP EXTENSION` | `X` | `X` | `X` | `-` |
`DROP FOREIGN DATA WRAPPER` | `X` | `X` | `X` | `-` |
`DROP FOREIGN TABLE` | `X` | `X` | `X` | `-` |
`DROP FUNCTION` | `X` | `X` | `X` | `-` |
`DROP INDEX` | `X` | `X` | `X` | `-` |
`DROP LANGUAGE` | `X` | `X` | `X` | `-` |
`DROP MATERIALIZED VIEW` | `X` | `X` | `X` | `-` |
`DROP OPERATOR` | `X` | `X` | `X` | `-` |
`DROP OPERATOR CLASS` | `X` | `X` | `X` | `-` |
`DROP OPERATOR FAMILY` | `X` | `X` | `X` | `-` |
`DROP OWNED` | `X` | `X` | `X` | `-` |
`DROP POLICY` | `X` | `X` | `X` | `-` |
`DROP PROCEDURE` | `X` | `X` | `X` | `-` |
`DROP PUBLICATION` | `X` | `X` | `X` | `-` |
`DROP ROUTINE` | `X` | `X` | `X` | `-` |
`DROP RULE` | `X` | `X` | `X` | `-` |
`DROP SCHEMA` | `X` | `X` | `X` | `-` |
`DROP SEQUENCE` | `X` | `X` | `X` | `-` |
`DROP SERVER` | `X` | `X` | `X` | `-` |
`DROP STATISTICS` | `X` | `X` | `X` | `-` |
`DROP SUBSCRIPTION` | `X` | `X` | `X` | `-` |
`DROP TABLE` | `X` | `X` | `X` | `-` |
`DROP TEXT SEARCH CONFIGURATION` | `X` | `X` | `X` | `-` |
`DROP TEXT SEARCH DICTIONARY` | `X` | `X` | `X` | `-` |
`DROP TEXT SEARCH PARSER` | `X` | `X` | `X` | `-` |
`DROP TEXT SEARCH TEMPLATE` | `X` | `X` | `X` | `-` |
`DROP TRIGGER` | `X` | `X` | `X` | `-` |
`DROP TYPE` | `X` | `X` | `X` | `-` |
`DROP USER MAPPING` | `X` | `X` | `X` | `-` |
`DROP VIEW` | `X` | `X` | `X` | `-` |
`GRANT` | `X` | `X` | `-` | `-` | Only for local objects
`IMPORT FOREIGN SCHEMA` | `X` | `X` | `-` | `-` |
`REFRESH MATERIALIZED VIEW` | `X` | `X` | `-` | `-` |
`REVOKE` | `X` | `X` | `-` | `-` | Only for local objects
`SECURITY LABEL` | `X` | `X` | `-` | `-` | Only for local objects
`SELECT INTO` | `X` | `X` | `-` | `-` |