How big will my dataset be?

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In approximating width, remember

+-------------------------------------------------------------+
| Type of variable                               Width        |
|-------------------------------------------------------------|
| Integers,     -127 <= x <=           126          1         |
|            -32,767 <= x <=        32,766          2         |
|     -2,147,483,647 <= x <= 2,147,483,646          4         |
| Floats,                                                     |
|       single precision (default)                  4         |
|       double precision                            8         |
| strings                                      maximum length |
+-------------------------------------------------------------+

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