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selecting closest number


php_b34st

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Hi, I have a table similar to the following:
|col1|col2|
_ _ _ _ _ _
|1    |300|
_`_`_`_ _
|2    |400|
_ _ _ _ _ _
|3    |500|
_ _ _ _ _ _
|4    |600|
_ _ _ _ _ _
|5    |700|

I would like it so that when a user enters a number for col 2 I can select the corresponding number in col 1 which is closest but not higher. for example if a user inputs 450 the db would output 2 becuse 400 is closest to it without being higher. Any ideas?
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