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Update index.md

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......@@ -158,7 +158,7 @@ Queries can be executed on both a table (subtable) and a STable. For a query on
In TDengine, it is recommended to use a subtable instead of a regular table for a DCP. In the meters example, we can create subtables like d1001, d1002, d1003, and d1004 under super table meters.
To better understand the data model using super table and subtable, please refer to ![Meters Data Model Diagram](./supertable.webp)
To better understand the data model using super table and subtable, please refer to the diagram below which demonstrates the data model of meters example. ![Meters Data Model Diagram](./supertable.webp)
## Database
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