# Relational Data and KV Transformation: Row Number

| `Row No.` | `...` | Name    | Birthday     | Cell Phone | Score |
| :-------- | :---- | :------ | :----------- | :--------- | :---- |
| 1         | `...` | `Tom`   | `1982-09-28` | 1390811212 | 78    |
| 2         | `...` | `Jack`  | `1996-04-12` | 1801222187 | 91    |
| 3         | `...` | `Frank` | `1982-09-28` | 1364571212 | 90    |
| 4         | `...` | `Tony`  | `1977-03-12` | 1391113134 | 65    |
| 5         | `...` | `Jim`   | `1992-07-19` | 1579915611 | 51    |
| 6         | `...` | `Sam`   | `1978-09-12` | 1713665011 | 97    |


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So I see the numbering column, that is, the primary key, as Key, and the collection of other columns as Value, because the primary key can be used to place only one row of data in the table, thus forming the prototype of key-value.