C
- CALL
- cardinality()
- 级联复制
- casefold()
- 目录版本号
- cbrt()
- ceil()
- ceiling()
- cfbot
- character_length()
- char_length()
- check_function_bodies
- check_password_hook
- 检查点 (Checkpoint)
- CHECKPOINT
- checkpoint_completion_target
- 检查点进程 (Checkpointer)
- checkpoint_flush_after
- checkpoint_segments
- checkpoint_timeout
- checkpoint_warning
- check_postgres
- Cheesecake
- chkpass
- chr()
- citext
- ClientAuthentication_hook
- client_connection_check_interval
- client_encoding
- client_min_messages
- clock_timestamp()
- CLOSE
- CLUSTER
- clusterdb
- cluster_name
- col_description()
- 命令标签
- COMMENT ON
- COMMIT
- commit_delay
- CommitFest
- 提交日志 (CLOG)
- 提交已准备事务
- commit_siblings
- commit_ts
- 通用表表达式（CTE）
- compute_query_id
- concat()
- concat_ws()
- config_file
- 连接服务文件
- conninfo
- Contrib模块
- convert()
- convert_from()
- convert_to()
- COPY
- 核心工具
- cos()
- cosd()
- cosh()
- cot()
- cotd()
- crc32()
- crc32c()
- 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
- createrole_self_grant
- 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 日志格式
- cube
- current_catalog
- current_database()
- current_date
- current_query()
- current_role
- current_schema
- current_schema()
- current_schemas()
- current_setting()
- current_time
- current_timestamp
- current_user
- currval()
- cursor_to_xml()
- cursor_to_xmlschema()
- cursor_tuple_fraction
- custom_variable_classes
- CVS