I
- ichar()
- IDENTIFY_SYSTEM
- idle_in_transaction_session_timeout
- idle_session_timeout
- ignore_checksum_failure
- ignore_invalid_pages
- ignore_system_indexes
- IMPORT FOREIGN SCHEMA
- include
- include_dir
- include_if_exists
- inet_client_addr()
- inet_client_port()
- inet_server_addr()
- inet_server_port()
- Information schema
- in_hot_standby
- initcap()
- initdb
- Initialization fork
- intagg
- intarray
- integer_datetimes
- isbn_issn
- isn
- Isolation tester