On 04/10/2012 15:52, MAS! wrote:
> Hi
>
> I know there'd be a reason, but I can't understand that..
>
> mysql> select @valore:=rand(), @valore, @valore:="ciao", @valore;
> +-------------------+-------------------+-----------------+---------+
> | @valore:=rand() | @valore | @valore:="ciao" | @valore |
> +-------------------+-------------------+-----------------+---------+
> | 0.483624490428366 | 0.483624490428366 | ciao | 0 |
> +-------------------+-------------------+-----------------+---------+
> 1 row in set (0.00 sec)
>
> mysql> select @valore:=rand(), @valore, @valore:="ciao", @valore;
> +-------------------+-------------------+-----------------+---------+
> | @valore:=rand() | @valore | @valore:="ciao" | @valore |
> +-------------------+-------------------+-----------------+---------+
> | 0.747058809499311 | 0.747058809499311 | ciao | ciao |
> +-------------------+-------------------+-----------------+---------+
> 1 row in set (0.00 sec)
>
> why in the first execution the latest value is 0 and not 'ciao'?
> and why in the first 2 columns the variables seems works as expected!?
what version of MySQL are you running? I get this:-
Server version: 5.5.17-log MySQL Community Server (GPL)
mysql> select @valore:=rand(), @valore, @valore:="ciao", @valore;
+--------------------+--------------------+-----------------+---------+
| @valore:=rand() | @valore | @valore:="ciao" | @valore |
+--------------------+--------------------+-----------------+---------+
| 0.8187706152151997 | 0.8187706152151997 | ciao | ciao |
+--------------------+--------------------+-----------------+---------+
Rich
