C
- CALL
- cardinality()
- Cascading replication
- Catalog version number
- cfbot
- check_function_bodies
- check_password_hook
- Checkpoint
- CHECKPOINT
- checkpoint_completion_target
- Checkpointer
- checkpoint_flush_after
- checkpoint_segments
- checkpoint_timeout
- checkpoint_warning
- check_postgres
- chkpass
- chr()
- citext
- ClientAuthentication_hook
- client_connection_check_interval
- client_encoding
- client_min_messages
- clock_timestamp()
- CLUSTER
- clusterdb
- cluster_name
- col_description()
- Command tag
- COMMENT ON
- COMMIT
- commit_delay
- CommitFest
- Commit log (CLOG)
- COMMIT PREPARED
- commit_siblings
- commit_ts
- Common Table Expression (CTE)
- compute_query_id
- concat()
- concat_ws()
- config_file
- Connection Service File
- conninfo
- Contrib module
- convert()
- convert_from()
- convert_to()
- COPY
- Core utility
- CREATE ACCESS METHOD
- CREATE AGGREGATE
- CREATE CAST
- CREATE COLLATION
- CREATE CONVERSION
- CREATE DATABASE
- createdb
- CREATE DOMAIN
- CREATE EVENT TRIGGER
- CREATE EXTENSION
- CREATE FOREIGN DATA WRAPPER
- CREATE FOREIGN TABLE
- CREATE FUNCTION
- CREATE GROUP
- CREATE INDEX
- createlang
- CREATE LANGUAGE
- CREATE MATERIALIZED VIEW
- CREATE OPERATOR
- CREATE OPERATOR CLASS
- CREATE OPERATOR FAMILY
- CREATE POLICY
- CREATE PROCEDURE
- CREATE PUBLICATION
- CREATE ROLE
- CREATE RULE
- CREATE SCHEMA
- CREATE SEQUENCE
- CREATE SERVER
- CREATE STATISTICS
- CREATE SUBSCRIPTION
- CREATE TABLE
- CREATE TABLE AS
- CREATE TABLESPACE
- CREATE TEXT SEARCH CONFIGURATION
- CREATE TEXT SEARCH DICTIONARY
- CREATE TEXT SEARCH PARSER
- CREATE TEXT SEARCH TEMPLATE
- CREATE TRANSFORM
- CREATE TRIGGER
- CREATE TYPE
- create_upper_paths_hook
- createuser
- CREATE USER
- CREATE USER MAPPING
- CREATE VIEW
- CSV
- CSV log format
- cube
- current_catalog
- current_database()
- current_date
- current_role
- current_schema
- current_schema()
- current_schemas()
- current_setting()
- current_time
- current_timestamp
- current_user
- currval()
- CVS