Re: Re[2]: ����� ������ ���� ...

Mon, 13 Nov 2006 13:50:15 -0800 


"Malinovsky Vladimir"
>...
> óÔÁÌÏ ÂÙÔØ, ÄÅÊÓÔ×ÉÔÅÌØÎÏ ÂÁÇ?

æÉÇ.

 select 'Ok' from  rdb$database
   where 0 not in  (null, 0)

ÔÏ ÖÅ ÓÁÍÏÅ, ÞÔÏ É:

 select 'Ok' from  rdb$database
   where  (null = 0 or 0=0)
ô.Å. ×ÓÅ ÐÒÁ×ÉÌØÎÏ.

...
á ×ÙÒÁÖÅÎÉÅ:

 select 'Ok' from  rdb$database
   where 0 not in  (null, 1)

ÔÏ ÖÅ ÓÁÍÏÅ, ÞÔÏ:

 select 'Ok' from  rdb$database
   where not (null=0 or 1=0)

ÉÌÉ ÔÏÖÅ ÓÁÍÏÅ:

 select 'Ok' from  rdb$database
   where (null<>0 and 1<>0)

á null<>0 - ×ÓÅÇÄÁ false
ô.Å. ÔÏÖÅ ×ÓÅ ÐÒÁ×ÉÌØÎÏ.

æÆÕ...

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