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Old 11-02-2003, 02:08 AM   #1
johnyy
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Registered: Jun 2003
Posts: 92

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mysql statement...


hello, i'm runing rhat9 with mysql, the question i got it's when i insert this sql statement.. the second row should't show up.. because
1st condition commission > 10 which = true
surname='Rive' which = false
first_name='Sol' which = false

so True OR false = True
True AND false = false; ???


mysql> SELECT * FROM sales_rep WHERE commission>10
OR surname='Rive' AND first_name='Sol';
+-----------------+----------+------------+------------+
| employee_number | surname | first_name | commission |
+-----------------+----------+------------+------------+
| 1 | Rive | Sol | 10 |
| 2 | Gordimer | Charlene | 15 |
+-----------------+----------+------------+------------+
2 rows in set (0.00 sec)

help

thanks
 
Old 11-02-2003, 03:30 AM   #2
Looking_Lost
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Registered: Apr 2003
Location: Eire
Distribution: Slackware 12.0, OpenSuse 10.3
Posts: 1,120

Rep: Reputation: 45
SELECT * FROM sales_rep WHERE commission>10 AND (surname='Rive' AND first_name='Sol');

The second row will show up because it meets the first part of the OR test namely their comission is greater than 10. OR means only one part of the comparision has to be true, AND means all parts. Use brackets to clarify things. It's difficult to see for sure whether you are trying to select all sales_rep's with commission greater than ten or the sales rep Rive Sol. Above should only select Rive Sol if their commission is greater than 10 but try and it and see.
 
  


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