dollar/currency/money, call it whatever you like, but if it's got a $ in front of it, then
it's a string, not a number. Your price
field should have been created as a decimal. I'm guessing it's a char type. You should
also set your fields to default to 0, not
NULL.
The problem is with your setup, not mysql. You shouldn't mix formatting (the $ sign) with
raw data, which is what you are doing.
What if the price is in euros? Then the $ is just wrong. Strip out the $ signs you mysql
may be able to translate it correctly.
----- Original Message -----
From: "Karl Larsen" <k5di@stripped>
To: <mysql@stripped>
Sent: Thursday, June 22, 2006 4:22 PM
Subject: Math problem
> I'm trying to multiply numbers one of which is money. The money looks like this:
>
> SELECT price FROM titles;
>
> | price |
> +--------+
> | $20.00 |
> | $19.99 |
> | $7.99 |
> | $19.99 |
> | $11.95 |
> | $19.99 |
> | $14.99 |
> | $11.95 |
> | $22.95 |
> | $2.99 |
> | $10.95 |
> | $7.00 |
> | $2.99 |
> | $20.95 |
> | NULL |
> | $19.99 |
> | $21.59 |
> | NULL |
> +--------+
> 18 rows in set (0.01 sec)
>
> When I use SELECT title_id, ytd_sales * price From titles;
>
> I get:
> | title_id | ytd_sales | price * ytd_sales |
> +----------+-----------+-------------------+
> | PC8888 | 4095 | 0 |
> | BU1032 | 4095 | 0 |
> | PS7777 | 3336 | 0 |
> | PS3333 | 4072 | 0 |
> | BU1111 | 3876 | 0 |
> | MC2222 | 2032 | 0 |
> | TC7777 | 4095 | 0 |
> | TC4203 | 15096 | 0 |
> | PC1035 | 8780 | 0 |
> | BU2075 | 18722 | 0 |
> | PS2091 | 2045 | 0 |
> | PS2106 | 111 | 0 |
> | MC3021 | 22246 | 0 |
> | TC3218 | 375 | 0 |
> | MC3026 | NULL | NULL |
> | BU7832 | 4095 | 0 |
> | PS1372 | 375 | 0 |
> | PC9999 | NULL | NULL |
> +----------+-----------+-------------------+
> 18 rows in set (0.04 sec)
>
> It appears that mysys 4.1 does not know how to multiply a dollar amount to another
> number. Has anyone else seen this problem?
>
> Karl
>
>
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