下载
编译与部署
开始使用
操作手册
- 数据导入
- 表结构变更
- 物化视图
- HTTP API
- FE
- MANAGER
- Bootstrap Action
- Cancel Load Action
- Check Decommission Action
- Check Storage Type Action
- Config Action
- Connection Action
- Get DDL Statement Action
- Get Load Info Action
- Get Load State
- Get FE log file
- Get Small File
- HA Action
- Hardware Info Action
- Health Action
- Log Action
- Logout Action
- Meta Action
- Meta Action
- Meta Replay State Action
- Profile Action
- Query Detail Action
- Query Profile Action
- Row Count Action
- Session Action
- Set Config Action
- Show Data Action
- Show Meta Info Action
- Show Proc Action
- Show Runtime Info Action
- Statement Execution Action
- System Action
- Table Query Plan Action
- Table Row Count Action
- Table Schema Action
- Upload Action
- CANCEL LABEL
- Compaction Action
- CONNECTION
- getlogfile
- GET LABEL STATE
- GET TABLETS ON A PARTICULAR BE
- PROFILE
- QUERY DETAIL
- RESTORE TABLET
- SHOW DATA
- MIGRATE SINGLE TABLET TO A PARTICULAR DISK
- GET TABLETS DISTRIBUTION BETWEEN DIFFERENT DISKS
- FE
- 运维操作
- 配置文件
- 拦截规则
- 备份与恢复
- Broker
- Colocation Join
- Bucket Shuffle Join
- 动态分区
- 数据导出
- 导出查询结果集
- 分区缓存
- 权限管理
- LDAP
- 资源管理
- 查询执行的统计
- Runtime Filter
- Segment V2 升级手册
- 文件管理器
- SQL MODE
- 时区
- 变量
- 更新
- 多租户和资源划分
最佳实践
扩展功能
- 审计日志插件
- Doris On ES
- Doris output plugin
- ODBC External Table Of Doris
- Doris 插件框架
- Spark Doris Connector
- Flink Doris Connector
- DataX doriswriter
- UDF
设计文档
SQL 手册
- SQL 函数
- 日期函数
- convert_tz
- curdate
- current_timestamp
- curtime,current_time
- date_add
- date_format
- date_sub
- datediff
- day
- dayname
- dayofmonth
- dayofweek
- dayofyear
- from_days
- from_unixtime
- hour
- makedate
- minute
- month
- monthname
- now
- second
- strtodate
- time_round
- timediff
- timestampadd
- timestampdiff
- to_days
- unix_timestamp
- utc_timestamp
- week
- weekofyear
- year
- yearweek
- 地理位置函数
- 字符串函数
- 聚合函数
- bitmap 函数
- Hash函数
- Doris 窗口函数使用
- CAST
- DIGITAL_MASKING
- 日期函数
- 语法帮助
- 用户账户管理
- 集群管理
- ADMIN CANCEL REPAIR
- ADMIN CLEAN TRASH
- ADMIN CHECK TABLET
- ADMIN REPAIR
- ADMIN SET CONFIG
- ADMIN SET REPLICA STATUS
- ADMIN SHOW CONFIG
- ADMIN SHOW REPLICA DISTRIBUTION
- ADMIN SHOW REPLICA STATUS
- ADMIN SHOW DATA SKEW
- ALTER CLUSTER
- ALTER SYSTEM
- CANCEL DECOMMISSION
- CREATE CLUSTER
- CREATE FILE
- DROP CLUSTER
- DROP FILE
- ENTER
- INSTALL PLUGIN
- LINK DATABASE
- MIGRATE DATABASE
- SET LDAPADMINPASSWORD
- SHOW BACKENDS
- SHOW BROKER
- SHOW FILE
- SHOW FRONTENDS
- SHOW FULL COLUMNS
- SHOW INDEX
- SHOW MIGRATIONS
- SHOW PLUGINS
- SHOW TABLE STATUS
- SHOW TRASH
- UNINSTALL PLUGIN
- DDL
- ALTER DATABASE
- ALTER TABLE
- ALTER VIEW
- BACKUP
- CANCEL ALTER
- CANCEL BACKUP
- CANCEL RESTORE
- CREATE DATABASE
- CREATE ENCRYPTKEY
- CREATE INDEX
- CREATE MATERIALIZED VIEW
- CREATE REPOSITORY
- CREATE RESOURCE
- CREATE TABLE LIKE
- CREATE TABLE
- CREATE VIEW
- DROP DATABASE
- DROP ENCRYPTKEY
- DROP INDEX
- DROP MATERIALIZED VIEW
- DROP REPOSITORY
- DROP RESOURCE
- DROP TABLE
- DROP VIEW
- HLL
- RECOVER
- RESTORE
- SHOW ENCRYPTKEYS
- SHOW RESOURCES
- TRUNCATE TABLE
- CREATE FUNCTION
- DROP FUNCTION
- SHOW FUNCTIONS
- DML
- BROKER LOAD
- CANCEL LOAD
- DELETE
- EXPORT
- GROUP BY
- LOAD
- MINI LOAD
- MULTI LOAD
- PAUSE ROUTINE LOAD
- RESUME ROUTINE LOAD
- ROUTINE LOAD
- SHOW ALTER
- SHOW BACKUP
- SHOW CREATE FUNCTION
- SHOW CREATE ROUTINE LOAD
- SHOW DATA
- SHOW DATABASES
- SHOW DELETE
- SHOW DYNAMIC PARTITION TABLES
- SHOW EXPORT
- SHOW LOAD
- SHOW PARTITIONS
- SHOW PROPERTY
- SHOW REPOSITORIES
- SHOW RESTORE
- SHOW ROUTINE LOAD TASK
- SHOW ROUTINE LOAD
- SHOW SNAPSHOT
- SHOW TABLES
- SHOW TABLET
- SHOW TRANSACTION
- SPARK LOAD
- STOP ROUTINE LOAD
- STREAM LOAD
- ALTER ROUTINE LOAD
- INSERT
- UPDATE
- 数据类型
- 辅助命令
开发者手册
- 调试工具
- Doris BE存储层Benchmark工具
- 使用 Eclipse 搭建 FE 开发环境
- 使用 IntelliJ IDEA 搭建 FE 开发环境
- Apache Doris Be 开发调试
- Java 代码格式化
- C++ 代码格式化
Apache 社区
文章来源于网络收集而来，版权归原创者所有，如有侵权请及时联系！
ltrim
description
Syntax
VARCHAR ltrim(VARCHAR str)
将参数 str 中从开始部分连续出现的空格去掉
example
mysql> SELECT ltrim(' ab d');
+------------------+
| ltrim(' ab d') |
+------------------+
| ab d |
+------------------+
keyword
LTRIM
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