本篇介绍随 PostgreSQL 官方源码分发的核心客户端编程接口。各章均可独立阅读。此外社区还存在大量由第三方独立维护的外部编程语言驱动库，它们各自维护着专属文档（Appendix H 列出了部分广受欢迎的开源接口驱动）。阅读本篇的读者应熟悉如何使用 SQL 检索与操作数据（参见 Part II），并掌握所选用编程语言的基本开发规范。
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COPY Commandinformation_schema_catalog_nameadministrable_role_authorizationsapplicable_rolesattributescharacter_setscheck_constraint_routine_usagecheck_constraintscollationscollation_character_set_applicabilitycolumn_column_usagecolumn_domain_usagecolumn_optionscolumn_privilegescolumn_udt_usagecolumnsconstraint_column_usageconstraint_table_usagedata_type_privilegesdomain_constraintsdomain_udt_usagedomainselement_typesenabled_rolesforeign_data_wrapper_optionsforeign_data_wrappersforeign_server_optionsforeign_serversforeign_table_optionsforeign_tableskey_column_usageparametersreferential_constraintsrole_column_grantsrole_routine_grantsrole_table_grantsrole_udt_grantsrole_usage_grantsroutine_column_usageroutine_privilegesroutine_routine_usageroutine_sequence_usageroutine_table_usageroutinesschematasequencessql_featuressql_implementation_infosql_partssql_sizingtable_constraintstable_privilegestablestransformstriggered_update_columnstriggersudt_privilegesusage_privilegesuser_defined_typesuser_mapping_optionsuser_mappingsview_column_usageview_routine_usageview_table_usageviews