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Разница между SPACE и ''



 
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Garik
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Joined: 11 Oct 2007
Posts: 60

PostPosted: Tue Feb 26, 2008 12:44 pm    Post subject: Разница между SPACE и '' Reply with quote

Добрый день!
Скажите, пожалуйста, в каких случаях есть разница между
SPACE и ''? В нижеприведенных select-ах возвращается одинаковый результат, хотя space - это же одинарный пробел, а не пусто.

SELECT * FROM LFA1 WHERE LIFNR IN SO_LIFNR
AND LOEVM EQ SPACE
AND SPERR EQ SPACE.

SELECT * FROM LFA1 WHERE LIFNR IN SO_LIFNR
AND LOEVM EQ ''
AND SPERR EQ ''.
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dr.killer
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Joined: 31 Oct 2007
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Location: 4.7, ECC 6.0

PostPosted: Thu Feb 28, 2008 1:08 am    Post subject: Reply with quote

В данном случае space, '' и ' ' равнозначны, но я использую space код вроде как красивее.
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vga
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PostPosted: Thu Feb 28, 2008 9:48 am    Post subject: Reply with quote

Поля LOEVM и SPERR в базе имеют тип char(1), проинициализированный пробелом, поэтому использование SPACE или одинарного пробела ' ' соответствует реальному знаxению, находящемуся в этих полях таблицы.
При использовании empty '', видимо, происходит неявное преобразование к space.
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