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commit ec9704540e63d0fc0af0fe483188fc2660952841 Author: Steve Yurong Su <[email protected]> AuthorDate: Sun Sep 26 11:30:00 2021 +0800 nested queries -> nested expressions --- docs/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md | 4 +--- .../zh/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md | 4 +--- 2 files changed, 2 insertions(+), 6 deletions(-) diff --git a/docs/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md b/docs/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md index 236f4a2..4b04ef9 100644 --- a/docs/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md +++ b/docs/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md @@ -468,9 +468,7 @@ Known Implementation UDF Libraries: + [IoTDB-Quality](https://thulab.github.io/iotdb-quality), a UDF library about data quality, including data profiling, data quality evalution and data repairing, etc. -### Nested Query (Subquery) - -"Nested query" is also called "subquery", that is, in a SQL statement, the result of the "inner query" can be used as the input of the "outer query". +### Nested Expressions IoTDB supports the execution of arbitrary nested expressions consisting of **time series, arithmetic expressions, and time series generation functions (including user-defined functions)** in the `select` clause. diff --git a/docs/zh/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md b/docs/zh/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md index e77fd83..ea5cd13 100644 --- a/docs/zh/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md +++ b/docs/zh/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md @@ -477,9 +477,7 @@ It costs 0.005s + [IoTDB-Quality](https://thulab.github.io/iotdb-quality)，一个关于数据质量的 UDF 库实现，包括数据画像、数据质量评估与修复等一系列函数。 -### 嵌套查询（子查询） - -“嵌套查询”又称为“子查询”，即在一条 SQL 语句中，“内层查询”的计算结果可以作为“外层查询”的计算对象来使用。 +### 嵌套表达式 IoTDB 支持在 `select` 字句中执行由**时间序列、算数运算表达式和时间序列生成函数（包括用户自定义函数）**组成的任意嵌套表达式。
