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questions in query on 7.1 and 7.2 - Mailing list pgsql-general

From Alex Cheung Tin Ka
Subject questions in query on 7.1 and 7.2
Date
Msg-id 008001c236a1$191eaaf0$6a44a8c0@alexpc
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Responses Re: questions in query on 7.1 and 7.2
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Dear All,
    I have a table progress which contain "duration" text, "op_str_time" text, "form_status" integer, "ao_eamil" text and "ao_res_time" timestamp.
    I have run the following query successful in pgsql 7.1 but failed in version 7.2.

select duration, op_str_time from progress where form_status = 4 and ao_email = 'abc@vtc.edu.hk' and ao_res_time is not null and extract(month from timestamp(op_str_time)) = 4;
 
    Please anyone tell me why that happened.
 
Thanks,
Alex

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