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Update index.md

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docs-cn/12-taos-sql/12-keywords/index.md
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@ -119,10 +119,10 @@ taos> SELECT COUNT(tbname) FROM meters WHERE groupId > 2;
Query OK, 1 row(s) in set (0.001091s)
```
### _QSTART/_QSTOP/_QDURATION
表示查询过滤窗口的起始，结束以及持续时间 (从2.6.0.0版本开始支持)
表示查询过滤窗口的起始，结束以及持续时间。
### _WSTART/_WSTOP/_WDURATION
窗口切分聚合查询（例如 interval/session window/state window）中表示每个切分窗口的起始，结束以及持续时间（从 2.6.0.0 版本开始支持）
窗口切分聚合查询（例如 interval/session window/state window）中表示每个切分窗口的起始，结束以及持续时间。
### _c0/_ROWTS
_c0 _ROWTS 等价，表示表或超级表的第一列