Re: Subquery

i hope it's helping sql code: UPDATE T020Employee SET T020FaxNo = T010FaxNo FROM T020Employee a JOIN T010Company b ON a.T020CoCd =b.T010CoCd ----- Original Message ----- From: "Ng Hwee Hwee" <hhwee@towa.com.sg> To: "PHP DB List" <php-db@lists.php.net> Sent: Monday, September 19, 2005 9:14 AM Subject: [PHP-DB] Subquery hi, can some one enlighten me on what is wrong with my query? I want to set the fax number of all the employees of a particular company to the company's fax number. This is because the employees do not have personal fax machines, thus instead of just leaving T020FaxNo blank, I want to update it with the company's fax number. However, the following doesn't work?! i'm hoping i don't have to write a PHP while loop to do this simple task! =( UPDATE T020Employee SET T020FaxNo = ( SELECT T010FaxNo FROM T010Company WHERE T010CoCd = 'XXX' ) WHERE T020CoCd = 'XXX' MySQL version: 3.23.58. PHP version: 4.3.4. My database structure is: T010Company =========== T010CoCd (primary key) T010CoName T010Address T010TelNo T010FaxNo T020Employee =========== T020CoCd (primary key, linking to T010CoCd) T020EmpCd (primary key) T020JobTitle T020TelNo T020FaxNo Thanks so much! Hwee