Hello all,

I have a (probably dumb) question. 
My table "temperatura" has two fields described bellow.

mysql> describe temperatura;
+-------------+----------+------+-----+---------+-------+
| Field            | Type     | Null | Key | Default | Extra |
+-------------+----------+------+-----+---------+-------+
| datetime      | datetime | YES  |     | NULL    |       |
| temperatura | float    | YES  |     | NULL    |       |
+-------------+----------+------+-----+---------+-------+
2 rows in set (0.00 sec)


When I try to select rows with floats, the result is an empty set.
For example:

mysql> select datetime,temperatura from temperatura where 
datetime="2002-02-08 09:30:00";
+---------------------+-------------+
| datetime            | temperatura |
+---------------------+-------------+
| 2002-02-08 09:30:00 |        15.8 |
+---------------------+-------------+
1 row in set (0.00 sec)

----------------------------> got one row :)

mysql>select datetime,temperatura from temperatura where datetime="2002-02-08 
09:30:00" and temperatura=15.8;

Empty set (0.00 sec)

----------> same thing but with the temperatura value, gives me an empy set :(

When I try to select another row but the temperatura field has an integer 
this is what happens:

mysql> select datetime,temperatura from temperatura where 
datetime="2002-01-25 09:40:00";
+---------------------+-------------+
| datetime            | temperatura |
+---------------------+-------------+
| 2002-01-25 09:40:00 |          16 |
+---------------------+-------------+
1 row in set (0.00 sec)

-----------> got one row :)

mysql> select datetime,temperatura from temperatura where 
datetime="2002-01-25 09:40:00" and temperatura=16;
+---------------------+-------------+
| datetime            | temperatura |
+---------------------+-------------+
| 2002-01-25 09:40:00 |          16 |
+---------------------+-------------+
1 row in set (0.00 sec)

--------------> It works now :/

Does anyone have an idea why this happens? How can I select float numbers?

Best wishes,

Miguel

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