remove last comma in string

[weetat <weetat.yeo@xxxxxxxxx>]

Hi all,

 I am using php 4.3.2 and mysql , linux.

 I have a sql statement below :

    UPDATE tbl_chassis_temp SET  country = 'Singapore',  city 
'SINGAPORE',  building = 'Tampines Central 6',  other = 'Level 03-40', 


I need to remove the last comma from sql text above.
I have tried using substr and rtrim , without any success ?
Anyone have any suggestion ?

THanks
- weetat

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