doc: add data model diagram in concept page
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@ -158,7 +158,7 @@ Queries can be executed on both a table (subtable) and a STable. For a query on
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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.
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To better understand the data model using super table and subtable, please refer to [Meters Data Model Diagram](supertable.webp)
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To better understand the data model using super table and subtable, please refer to 
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## Database
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@ -159,7 +159,7 @@ TDengine 建议用数据采集点的名字(如上表中的 D1001)来做表
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TDengine系统建议给一个数据采集点建表,需要通过超级表建表,而不是建普通表。在智能电表的示例中,我们可以通过超级表meters创建子表d1001, d1002, d1003, d1004等。
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为了更好地理解超级与子表的关系,可以参考 [智能电表数据模型示意图](supertable.webp)
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为了更好地理解超级与子表的关系,可以参考 
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## 库 (database)
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