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运算规则请参见表1，表中的a和b代表逻辑表达式。
表 1 运算规则表
逻辑操作符
- 快速入门
- 开发者指南
- 用户自定义函数
- 导出数据
- DBE_PERF Schema
- Workload Manager
- Operator
- Configuration
- OS
- Session/Thread
- THREAD_WAIT_STATUS
- GLOBAL_THREADPOOL_STATUS
- GLOBAL_SESSION_STAT_ACTIVITY
- GLOBAL_SESSION_TIME
- STATEMENT_IOSTAT_COMPLEX_RUNTIME
- SESSION_TIME
- SESSION_MEMORY_DETAIL
- SESSION_CPU_RUNTIME
- GLOBAL_SESSION_MEMORY
- GLOBAL_SESSION_MEMORY_DETAIL
- SESSION_MEMORY_RUNTIME
- GLOBAL_THREAD_WAIT_STATUS
- SESSION_MEMORY
- SESSION_STAT_ACTIVITY
- GLOBAL_SESSION_STAT
- SESSION_STAT
- LOCAL_THREADPOOL_STATUS
- File
- Wait Events
- Query
- STATEMENT_USER_COMPLEX_HISTORY
- STATEMENT_COUNT
- GLOBAL_STATEMENT_COMPLEX_RUNTIME
- STATEMENT_WLMSTAT_COMPLEX_RUNTIME
- GLOBAL_STATEMENT_COUNT
- STATEMENT
- SUMMARY_STATEMENT_COUNT
- STATEMENT_COMPLEX_HISTORY_TABLE
- STATEMENT_COMPLEX_RUNTIME
- SUMMARY_STATEMENT
- GLOBAL_STATEMENT_COMPLEX_HISTORY
- STATEMENT_COMPLEX_HISTORY
- GLOBAL_STATEMENT_COMPLEX_HISTORY_TABLE
- STATEMENT_RESPONSETIME_PERCENTILE
- Memory
- Instance
- Cache/IO
- GLOBAL_STAT_DB_CU
- STATIO_SYS_TABLES
- STATIO_ALL_TABLES
- GLOBAL_STATIO_SYS_INDEXES
- STATIO_ALL_SEQUENCES
- STATIO_USER_INDEXES
- SUMMARY_STATIO_SYS_INDEXES
- SUMMARY_STATIO_ALL_TABLES
- STATIO_USER_TABLES
- STATIO_ALL_INDEXES
- SUMMARY_STATIO_ALL_INDEXES
- GLOBAL_STATIO_USER_SEQUENCES
- GLOBAL_STAT_SESSION_CU
- SUMMARY_STATIO_SYS_SEQUENCES
- SUMMARY_STATIO_USER_TABLES
- SUMMARY_STATIO_USER_SEQUENCES
- STATIO_SYS_INDEXES
- SUMMARY_STATIO_USER_INDEXES
- GLOBAL_STATIO_USER_INDEXES
- SUMMARY_STATIO_SYS_TABLES
- GLOBAL_STATIO_USER_TABLES
- GLOBAL_STATIO_ALL_TABLES
- GLOBAL_STATIO_SYS_SEQUENCES
- GLOBAL_STATIO_SYS_TABLES
- SUMMARY_STATIO_ALL_SEQUENCES
- STATIO_SYS_SEQUENCES
- GLOBAL_STATIO_ALL_INDEXES
- STATIO_USER_SEQUENCES
- GLOBAL_STATIO_ALL_SEQUENCES
- Object
- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_SYS_TABLES
- GLOBAL_STAT_USER_INDEXES
- GLOBAL_STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_USER_TABLES
- SUMMARY_STAT_BAD_BLOCK
- SUMMARY_STAT_DATABASE
- SUMMARY_STAT_ALL_INDEXES
- GLOBAL_STAT_ALL_INDEXES
- GLOBAL_STAT_USER_FUNCTIONS
- GLOBAL_STAT_SYS_INDEXES
- SUMMARY_STAT_XACT_SYS_TABLES
- GLOBAL_STAT_USER_TABLES
- STAT_XACT_SYS_TABLES
- STAT_XACT_USER_TABLES
- SUMMARY_STAT_USER_TABLES
- GLOBAL_STAT_BAD_BLOCK
- GLOBAL_STAT_DATABASE_CONFLICTS
- STAT_DATABASE
- STAT_USER_INDEXES
- GLOBAL_STAT_ALL_TABLES
- GLOBAL_STAT_XACT_USER_TABLES
- STAT_USER_FUNCTIONS
- SUMMARY_STAT_SYS_INDEXES
- STAT_DATABASE_CONFLICTS
- STAT_USER_TABLES
- SUMMARY_STAT_SYS_TABLES
- GLOBAL_STAT_SYS_TABLES
- STAT_XACT_USER_FUNCTIONS
- SUMMARY_STAT_ALL_TABLES
- STAT_ALL_INDEXES
- SUMMARY_STAT_XACT_ALL_TABLES
- GLOBAL_STAT_DATABASE
- STAT_SYS_INDEXES
- SUMMARY_STAT_USER_FUNCTIONS
- SUMMARY_STAT_USER_INDEXES
- STAT_ALL_TABLES
- STAT_BAD_BLOCK
- STAT_XACT_ALL_TABLES
- SUMMARY_STAT_DATABASE_CONFLICTS
- SUMMARY_STAT_XACT_USER_FUNCTIONS
- GLOBAL_STAT_XACT_USER_FUNCTIONS
- Transaction
- Workload
- Lock
- Utility
- GLOBAL_CKPT_STATUS
- GLOBAL_RECORD_RESET_TIME
- CLASS_VITAL_INFO
- GLOBAL_GET_BGWRITER_STATUS
- USER_LOGIN
- REPLICATION_STAT
- GLOBAL_REPLICATION_STAT
- GLOBAL_RECOVERY_STATUS
- SUMMARY_USER_LOGIN
- GLOBAL_PAGEWRITER_STATUS
- GLOBAL_REDO_STATUS
- BGWRITER_STAT
- GLOBAL_BGWRITER_STAT
- GLOBAL_REPLICATION_SLOTS
- GLOBAL_DOUBLE_WRITE_STATUS
- REPLICATION_SLOTS
- AI特性
- 系统表和系统视图
- 系统视图
- PG_STATS
- GS_THREAD_MEMORY_DETAIL
- PG_STAT_SYS_INDEXES
- PG_TIMEZONE_NAMES
- PG_STAT_ACTIVITY
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_REPLICATION
- PG_STATIO_SYS_SEQUENCES
- GS_STAT_SESSION_CU
- GS_WLM_SESSION_HISTORY
- PG_STAT_XACT_SYS_TABLES
- PG_LOCKS
- PG_RULES
- PG_STAT_ALL_TABLES
- GS_SESSION_TIME
- GS_WLM_USER_INFO
- GS_SQL_COUNT
- GS_FILE_STAT
- PG_STATIO_ALL_SEQUENCES
- PG_THREAD_WAIT_STATUS
- PG_STAT_USER_FUNCTIONS
- GS_SESSION_STAT
- PG_STAT_DATABASE_CONFLICTS
- GS_OS_RUN_INFO
- PLAN_TABLE
- PG_TIMEZONE_ABBREVS
- GS_WLM_SESSION_INFO_ALL
- PG_STAT_USER_INDEXES
- PG_WLM_STATISTICS
- GS_SESSION_CPU_STATISTICS
- PG_STAT_XACT_USER_TABLES
- PG_OS_THREADS
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_STAT_ALL_INDEXES
- PG_STATIO_ALL_TABLES
- PG_STATIO_ALL_INDEXES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STATIO_SYS_TABLES
- PG_SETTINGS
- PG_NODE_ENV
- PG_EXT_STATS
- GS_SESSION_MEMORY_STATISTICS
- PG_SESSION_IOSTAT
- PG_PREPARED_STATEMENTS
- PG_VIEWS
- PG_GTT_STATS
- PG_SECLABELS
- GS_WLM_OPERATOR_HISTORY
- PG_STAT_SYS_TABLES
- PG_GTT_ATTACHED_PIDS
- PG_GROUP
- PG_STAT_BAD_BLOCK
- PG_PREPARED_XACTS
- MPP_TABLES
- PG_GTT_RELSTATS
- PG_USER_MAPPINGS
- GS_WLM_OPERATOR_STATISTICS
- PG_MATVIEWS
- PG_ROLES
- GS_WLM_PLAN_OPERATOR_HISTORY
- PG_GET_INVALID_BACKENDS
- GS_STAT_DB_CU
- PG_AVAILABLE_EXTENSIONS
- PG_STATIO_SYS_INDEXES
- PG_STAT_DATABASE
- PG_REPLICATION_SLOTS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_TDE_INFO
- GS_REDO_STAT
- PG_VARIABLE_INFO
- PG_SHADOW
- PG_AVAILABLE_EXTENSION_VERSIONS
- GS_SESSION_MEMORY
- GS_WLM_SESSION_STATISTICS
- PG_TOTAL_USER_RESOURCE_INFO
- PG_USER
- GS_INSTANCE_TIME
- PG_CURSORS
- PG_STATIO_USER_TABLES
- GS_SESSION_MEMORY_DETAIL
- GS_WLM_RESOURCE_POOL
- GS_WLM_REBUILD_USER_RESOURCE_POOL
- GS_TOTAL_MEMORY_DETAIL
- PG_STAT_USER_TABLES
- PG_STAT_BGWRITER
- PG_RLSPOLICIES
- PG_STATIO_USER_SEQUENCES
- PG_TABLES
- PG_SESSION_WLMSTAT
- PG_INDEXES
- PG_STATIO_USER_INDEXES
- 系统表
- PG_WORKLOAD_GROUP
- GS_WLM_PLAN_ENCODING_TABLE
- PG_TS_CONFIG_MAP
- PG_OPERATOR
- PLAN_TABLE_DATA
- PG_PARTITION
- PG_LARGEOBJECT_METADATA
- PG_PROC
- PG_EXTENSION_DATA_SOURCE
- PG_RANGE
- PG_STATISTIC_EXT
- PG_DIRECTORY
- GS_WLM_INSTANCE_HISTORY
- PG_DB_ROLE_SETTING
- PG_DATABASE
- PG_INHERITS
- PG_OPFAMILY
- PG_USER_MAPPING
- PG_JOB_PROC
- PG_TRIGGER
- PG_EXTENSION
- PG_SHDEPEND
- PG_TS_TEMPLATE
- PG_APP_WORKLOADGROUP_MAPPING
- PG_TS_PARSER
- PG_AMPROC
- PG_OPCLASS
- PG_SHSECLABEL
- PG_AMOP
- PG_NAMESPACE
- PG_ATTRDEF
- GS_WLM_USER_RESOURCE_HISTORY
- PG_SHDESCRIPTION
- PG_FOREIGN_DATA_WRAPPER
- GS_WLM_PLAN_OPERATOR_INFO
- PG_AGGREGATE
- PG_FOREIGN_SERVER
- PG_OBJECT
- PG_LARGEOBJECT
- PG_USER_STATUS
- PG_TABLESPACE
- PG_AM
- PG_CLASS
- PG_REWRITE
- PG_RLSPOLICY
- PG_CONVERSION
- PG_DESCRIPTION
- PG_DEFAULT_ACL
- PG_LANGUAGE
- PG_AUTHID
- PG_PLTEMPLATE
- PG_SECLABEL
- PG_ATTRIBUTE
- PG_CONSTRAINT
- PG_AUTH_HISTORY
- GS_OPT_MODEL
- PG_TYPE
- PG_INDEX
- PG_FOREIGN_TABLE
- PG_COLLATION
- PG_RESOURCE_POOL
- PG_JOB
- PG_AUTH_MEMBERS
- PG_CAST
- PG_TS_CONFIG
- PG_DEPEND
- PG_ENUM
- PG_STATISTIC
- GS_WLM_OPERATOR_INFO
- PG_TS_DICT
- 系统表和系统视图概述
- 系统视图
- 数据库使用
- 管理数据库安全
- 应用程序开发教程
- 自治事务
- 配置运行参数
- 导入数据
- 接口参考
- libpq
- ODBC
- JDBC
- javax.sql.ConnectionPoolDataSource
- java.sql.PreparedStatement
- javax.sql.PooledConnection
- java.sql.DatabaseMetaData
- java.sql.ResultSet
- javax.naming.Context
- java.sql.CallableStatement
- java.sql.ResultSetMetaData
- CopyManager
- java.sql.Connection
- java.sql.Driver
- javax.sql.DataSource
- java.sql.Statement
- javax.naming.spi.InitialContextFactory
- 逻辑复制
- 常见故障定位指南
- 常见故障定位手段
- 常见故障定位案例
- 在XFS文件系统中，使用du命令查询数据文件大小大于文件实际大小
- 在XFS文件系统中，出现文件损坏
- core问题定位
- 备机处于need repair(WAL)状态问题
- 业务运行时整数转换错
- 内存不足问题
- 服务启动失败
- btree 索引故障情况下应对策略
- 分析查询语句运行状态
- 执行 SQL 语句时，提示 Lock wait timeout
- 分析查询效率异常降低的问题
- 磁盘空间达到阈值，数据库只读
- 高并发报错”too many clients already”或无法创建线程
- TPCC运行时，注入磁盘满故障，TPCC卡住的问题
- 修改索引时只调用索引名提示索引不存在
- 出现“Error:No space left on device”提示
- 分析查询语句长时间运行的问题
- 分析查询语句是否被阻塞
- 重建索引失败
- switchover操作时，主机降备卡住
- 不同用户查询同表显示数据不同
- VACUUM FULL一张表后，表文件大小无变化
- 强制结束指定的问题会话
- 执行修改表分区操作时报错
- SQL参考
- openGauss SQL
- DDL语法一览表
- 附录
- 全文检索
- DCL语法一览表
- 类型转换
- 数据类型
- 常量与宏
- DML语法一览表
- 表达式
- 函数和操作符
- 关键字
- 系统操作
- 事务控制
- SQL语法
- REASSIGN OWNED
- DROP OWNED
- DROP FOREIGN TABLE
- DROP VIEW
- CREATE TABLE AS
- SET TRANSACTION
- DROP SERVER
- ALTER TRIGGER
- CREATE TEXT SEARCH DICTIONARY
- VACUUM
- DECLARE
- SHOW
- CREATE DATABASE
- RESET
- CREATE PROCEDURE
- SET SESSION AUTHORIZATION
- DROP SYNONYM
- ALTER DATA SOURCE
- DROP ROW LEVEL SECURITY POLICY
- CREATE VIEW
- SELECT
- COPY
- ALTER SERVER
- DROP USER MAPPING
- CLUSTER
- ALTER DEFAULT PRIVILEGES
- ALTER SYSTEM KILL SESSION
- START TRANSACTION
- PREPARE TRANSACTION
- ABORT
- CREATE FOREIGN TABLE
- CREATE SYNONYM
- CREATE FUNCTION
- CREATE USER MAPPING
- SHUTDOWN
- GRANT
- CREATE INDEX
- ALTER USER MAPPING
- DROP FUNCTION
- DROP USER
- DROP PROCEDURE
- DROP ROLE
- EXPLAIN
- CREATE GROUP
- ALTER TABLESPACE
- ALTER TEXT SEARCH DICTIONARY
- REINDEX
- ALTER FUNCTION
- COMMIT | END
- ALTER DIRECTORY
- DO
- VALUES
- ALTER INDEX
- DROP TYPE
- DROP TEXT SEARCH CONFIGURATION
- CREATE DIRECTORY
- INSERT
- TRUNCATE
- DROP DATA SOURCE
- ALTER TABLE
- SELECT INTO
- DROP SEQUENCE
- CREATE USER
- ALTER SEQUENCE
- DROP DATABASE
- CREATE TABLESPACE
- ALTER GROUP
- ALTER DATABASE
- ROLLBACK TO SAVEPOINT
- ALTER TYPE
- SAVEPOINT
- COMMENT
- ALTER SYNONYM
- ROLLBACK
- DELETE
- ROLLBACK PREPARED
- CREATE TEXT SEARCH CONFIGURATION
- RELEASE SAVEPOINT
- ALTER USER
- CLOSE
- BEGIN
- CREATE TABLE
- DROP TABLE
- ALTER TABLE PARTITION
- ALTER TEXT SEARCH CONFIGURATION
- MOVE
- CREATE ROW LEVEL SECURITY POLICY
- CALL
- ALTER FOREIGN TABLE
- ALTER SCHEMA
- CURSOR
- DROP GROUP
- DROP DIRECTORY
- DROP INDEX
- UPDATE
- FETCH
- DROP TEXT SEARCH DICTIONARY
- PREPARE
- SET ROLE
- DROP MATERIALIZED VIEW
- CHECKPOINT
- DEALLOCATE
- CREATE ROLE
- SET CONSTRAINTS
- CREATE DATA SOURCE
- ALTER ROW LEVEL SECURITY POLICY
- CREATE TRIGGER
- DROP SCHEMA
- DROP TABLESPACE
- COMMIT PREPARED
- CREATE TYPE
- ALTER LARGE OBJECT
- MERGE INTO
- CREATE SCHEMA
- REFRESH MATERIALIZED VIEW
- ALTER MATERIALIZED VIEW
- ALTER SESSION
- EXECUTE
- SET
- EXPLAIN PLAN
- CREATE SEQUENCE
- REVOKE
- ANALYZE | ANALYSE
- DROP TRIGGER
- CREATE TABLE PARTITION
- LOCK
- CREATE SERVER}
- ALTER ROLE
- CREATE MATERIALIZED VIEW
- ALTER VIEW
- GUC参数说明
- 存储过程
- WDR Snapshot Schema
- Foreign Data Wrapper
- 内存表特性
- 概述
- 性能调优
- 工具参考
- 法律声明
- 安装指南
- 产品描述
- 技术白皮书
- 发行说明
- 管理员指南
- 术语表
- FAQ
- 编译指导书
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