@@ -36,7 +36,7 @@ TDengine is an open source, cloud native time-series database optimized for Inte
# Documentation
For user manual, system design and architecture, engineering blogs, refer to [TDengine Documentation](https://docs.tdengine.com)(中文版请点击[这里](https://docs.taosdata.com))
For user manual, system design and architecture, please refer to [TDengine Documentation](https://docs.tdengine.com)(中文版请点击[这里](https://docs.taosdata.com))
`Select_exprs`可以是表所属列的列名,也可以是基于列的函数表达式或计算式,数量的上限 256 个。当用户使用了`interval`或`group by tags`的子句以后,在最后返回结果中会强制返回时间戳列(第一列)和 group by 子句中的标签列。后续的版本中可以支持关闭 group by 子句中隐式列的输出,列输出完全由 select 子句控制。
### 伪列
**TBNAME**
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@@ -152,7 +148,13 @@ taos> SELECT ts, ts AS primary_key_ts FROM d1001;