Hi
I'm having a simple but annoying problem:
i want to round() the value of a column, but the number of digits is
depending on the value of another column. i found out, that this doesn't work:
create table testme
-> (number double (5,4),digits tinyint(3));
Query OK, 0 rows affected (0.08 sec)
mysql> explain testme;
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| number | double(6,4) | YES | | NULL | |
| digits | tinyint(3) | YES | | NULL | |
+--------+-------------+------+-----+---------+-------+
2 rows in set (0.08 sec)
mysql> insert into testme values (100.4235,3),(85.4,1);
Query OK, 2 rows affected (0.08 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from testme;
+----------+--------+
| number | digits |
+----------+--------+
| 100.4235 | 3 |
| 85.4000 | 1 |
+----------+--------+
2 rows in set (0.08 sec)
mysql> select round(number,digits) from testme;
+----------------------+
| round(number,digits) |
+----------------------+
| 100.4240 |
| 85.4000 |
+----------------------+
2 rows in set (0.08 sec)
is there any way i could do this with *one* query?
the only solution i see is to read the digits-column with a script and then
create a new query, but thats not possible in my case...
thanks for any help
Richard
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