wade zhang
GitHub
commit
f66cdee7a5
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@ -98,7 +98,7 @@ Provides information about user-created databases. Similar to SHOW DATABASES.
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| 21 | cachesize | INT | Memory per vnode used for caching the newest data. It should be noted that `cachesize` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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| 22 | wal_level | INT | WAL level. It should be noted that `wal_level` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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| 23 | wal_fsync_period | INT | Interval at which WAL is written to disk. It should be noted that `wal_fsync_period` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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| 24 | wal_retention_period | INT | WAL retention period. It should be noted that `wal_retention_period` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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| 24 | wal_retention_period | INT | WAL retention period, in second. It should be noted that `wal_retention_period` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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| 25 | wal_retention_size | INT | Maximum WAL size. It should be noted that `wal_retention_size` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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| 26 | stt_trigger | SMALLINT | The threshold for number of files to trigger file merging. It should be noted that `stt_trigger` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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| 27 | table_prefix | SMALLINT | The prefix length in the table name that is ignored when distributing table to vnode based on table name. It should be noted that `table_prefix` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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@ -297,3 +297,13 @@ Provides dnode configuration information.
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| 7 | target_table | BINARY(192) | Target table |
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| 8 | watermark | BIGINT | Watermark (see stream processing documentation). It should be noted that `watermark` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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| 9 | trigger | INT | Method of triggering the result push (see stream processing documentation). It should be noted that `trigger` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
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## INS_USER_PRIVILEGES
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| # | **Column** | **Data Type** | **Description** |** |
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| --- | :----------: | ------------ | -------------------------------------------|
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| 1 | user_name | VARCHAR(24) | Username |
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| 2 | privilege | VARCHAR(10) | Privilege description |
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| 3 | db_name | VARCHAR(65) | Database name |
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| 4 | table_name | VARCHAR(193) | Table name |
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| 5 | condition | VARCHAR(49152) | The privilege filter for child tables |
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@ -79,6 +79,12 @@ Parameter Description:
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- tz: Optional parameter that specifies the timezone of the returned time, following the IANA Time Zone rules, e.g. `America/New_York`.
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- req_id: Optional parameter that specifies the request id for tracing.
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:::note
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URL Encoding. Make sure that parameters are properly encoded. For example, when specifying a timezone you must properly encode special characters. ?tz=Etc/GMT+10 will not work because the <+> plus symbol is recognized as a space in the url. It's best practice to encode all special characters in a parameter. Instead use ?tz=Etc%2FGMT%2B10 for the parameter.
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:::
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For example, `http://h1.taos.com:6041/rest/sql/test` is a URL to `h1.taos.com:6041` and sets the default database name to `test`.
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TDengine supports both Basic authentication and custom authentication mechanisms, and subsequent versions will provide a standard secure digital signature mechanism for authentication.
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@ -338,7 +338,7 @@ Remark:
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Equivalent function: sum
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```sql
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Select max(value) from (select first(val) value from table_name interval(10s) fill(linear)) interval(10s)
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Select sum(value) from (select first(val) value from table_name interval(10s) fill(linear)) interval(10s)
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```
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Note: This function has no interpolation requirements, so it can be directly calculated.
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@ -98,7 +98,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
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| 21 | cachesize | INT | 表示每个 vnode 中用于缓存子表最近数据的内存大小。需要注意，`cachesize` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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| 22 | wal_level | INT | WAL 级别。需要注意，`wal_level` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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| 23 | wal_fsync_period | INT | 数据落盘周期。需要注意，`wal_fsync_period` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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| 24 | wal_retention_period | INT | WAL 的保存时长。需要注意，`wal_retention_period` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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| 24 | wal_retention_period | INT | WAL 的保存时长，单位为秒。需要注意，`wal_retention_period` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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| 25 | wal_retention_size | INT | WAL 的保存上限。需要注意，`wal_retention_size` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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| 26 | stt_trigger | SMALLINT | 触发文件合并的落盘文件的个数。需要注意，`stt_trigger` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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| 27 | table_prefix | SMALLINT | 内部存储引擎根据表名分配存储该表数据的 VNODE 时要忽略的前缀的长度。需要注意，`table_prefix` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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@ -298,3 +298,13 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
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| 7 | target_table | BINARY(192) | 流计算写入的目标表 |
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| 8 | watermark | BIGINT | watermark，详见 SQL 手册流式计算。需要注意，`watermark` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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| 9 | trigger | INT | 计算结果推送模式，详见 SQL 手册流式计算。需要注意，`trigger` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
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## INS_USER_PRIVILEGES
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| # | **列名** | **数据类型** | **说明** |
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| --- | :----------: | ------------ | -------------------------------------------------------------------------------------------------------------------- |
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| 1 | user_name | VARCHAR(24) | 用户名
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| 2 | privilege | VARCHAR(10) | 权限描述
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| 3 | db_name | VARCHAR(65) | 数据库名称
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| 4 | table_name | VARCHAR(193) | 表名称
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| 5 | condition | VARCHAR(49152) | 子表权限过滤条件
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@ -371,7 +371,7 @@ Select min(val) from table_name
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等效函数：sum
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```sql
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Select max(value) from (select first(val) value from table_name interval(10s) fill(linear)) interval(10s)
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Select sum(value) from (select first(val) value from table_name interval(10s) fill(linear)) interval(10s)
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```
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备注：该函数无插值需求，因此可用直接计算。
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