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BUG #5001: can not prepare for where $1 is null - Mailing list pgsql-bugs

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Subject BUG #5001: can not prepare for where $1 is null
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Msg-id 200908210841.n7L8fIQq083062@wwwmaster.postgresql.org
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Responses Re: BUG #5001: can not prepare for where $1 is null  (Pavel Stehule <pavel.stehule@gmail.com>)
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The following bug has been logged online:

Bug reference:      5001
Logged by:
Email address:      94487509@qq.com
PostgreSQL version: 8.3.3
Operating system:   linux
Description:        can not prepare for where $1 is null
Details:

why can not prepare like this? thanks!
 prepare ssss as select * from test where $1 is null;
 ERROR:  could not determine data type of parameter $1

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