Question

Possible Duplicate:
MySql select format, round column

When i make a SQL query using the ROUND(X, D), where D is a column name rather than the direct integer value, the result is rounded fine, but has too many decimal digits.

For example,

SELECT b.digits, ROUND(a.amount, b.digits) as amount
FROM a
JOIN b
ON a.number_id = b.id

the result is something like this:

3  357.143000000000000000000000
2   89.290000000000000000000000
4  696.436600000000000000000000
2  214.290000000000000000000000
2  328.570000000000000000000000
2  437.500000000000000000000000

The column b.digits contains the digits to which the value must be rounded. It is possible to get the result based on the digits, like this:

3  357.143
2   89.29
4  696.4366
2  214.29
2  328.57
2  437.50

Answer 1

try with the format function:

like this:

SELECT b.digits, FORMAT(a.amount, b.digits) as amount
FROM a
JOIN b
ON a.number_id = b.id