Extend precision of MySQL's double datatype?

I am trying to save the value "6.714285714285714" into a DOUBLE datatype field.

Unfortunately, it does not fit at all and is trimmed by one digit. Storing larger numbers becomes less precise.

I have already searched in the mysql manual and it seems to be th开发者_StackOverflow社区at double is the most precise data type available. Does anyone know a practical workaround?

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DECIMAL is a better choice than DOUBLE if you need precision.