Re: select * from mytable where myfield=null;

From: "Marin Dimitrov" <marin(dot)dimitrov(at)sirma(dot)bg>
To: <hoanui(at)excite(dot)com>, <pgsql-jdbc(at)postgresql(dot)org>
Subject: Re: select * from mytable where myfield=null;
Date: 2002-05-14 10:03:00
Message-ID: 003301c1fb2e$87823790$9ba1d53e@sirma.bg
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----- Original Message -----
From: Hoanui Morangie

Hi,

I understand that this behavior is a standard but agree with Bruno that it's nonsense. I have trouble with it in my own application. I use sql command like "select * from A where A.a=? and A.b=? and A.c=? and A.d=? and A.e=?". There are five parameters in my query and each of them can be null! I can not create SQL command string for all possible combinations of null values so I have to build the query dynamically. Why then use prepared statement?

I doubt that anybody ever needed x=null in SQL command but it seems that my example is very common. There SHOULD be some workaround for that. But I agree that this is not topic for this list.

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don't use NULLs - introduce a dummy value that bears the semantic of NULL so u can use "= XXX" instead of " is NULL"

hth,

Marin

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