RE: [PHP-DB] Subquery

It doesn't work because MySQL version 3.23.50 does not support sub-select statement. http://dev.mysql.com/doc/mysql/en/subqueries.html And How to re-write it in MySQL < 4.1 http://dev.mysql.com/doc/mysql/en/rewriting-subqueries.html Nandar wrote on Monday, 19 September 2005 1:03 PM: > 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