[EMAIL PROTECTED] wrote:
>
> >Description:
>
> if a column is defined as float(3,1) and your sql query
> uses where in that particular column and the value has
> decimals on it then you got empty set.
>
> >How-To-Repeat:
>
> ($:~) mysql stuff
> Reading table information for completion of table and column names
> You can turn off this feature to get a quicker startup with -A
>
> Welcome to the MySQL monitor. Commands end with ; or \g.
> Your MySQL connection id is 35 to server version: 3.23.32
>
> Type 'help;' or '\h' for help. Type '\c' to clear the buffer
>
> mysql> select max(tiesaailma) from tiesaa;
> +-----------------+
> | max(tiesaailma) |
> +-----------------+
> | 5.3 |
> +-----------------+
> 1 row in set (3.92 sec)
>
> mysql> select tiesaailma,tiesaacity from tiesaa where tiesaailma=5.3;
> Empty set (1.13 sec)
>
> mysql> select tiesaailma,tiesaacity from tiesaa where tiesaailma=3;
> +------------+-----------------------------------+
> | tiesaailma | tiesaacity |
> +------------+-----------------------------------+
> | 3.0 | Tie 8; Pattijoki |
> | 3.0 | Tie 8; Närpiö, Bäckliden |
> | 3.0 | Tie 8; Närpiö, Bäckliden |
> | 3.0 | Tie 8; Pattijoki |
> | 3.0 | Tie 2; Pori, Kähkönen |
> | 3.0 | Tie 8; Kristiinankaup, Lapväärtti |
> | 3.0 | Tie 83; Ylitornio, Raanujärvi |
> +------------+-----------------------------------+
> 7 rows in set (1.12 sec)
>
> mysql>
>
> >Fix:
>
> not known.
>
>
The fix is to not test floating point numbers for equality.
5.3 can not be represented exactly in binary.
If you wish to test for equality, use DECIMAL instead of FLOAT.
It is stored unpacked ( as a string ).
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