A clarification. If a string value begins with a digit, MySQL does not
convert it to zero (FALSE), but rather to an integer made up of the
leading digits in the value (until a non-digit is reached). This can be
shown by using the CAST() function.
mysql> SELECT '21b' = 0, CAST('21b' AS SIGNED);
Jon Stephens <[EMAIL PROTECTED]> wrote:
> *Any* string value evaluates as 0 (FALSE), not just the empty string.
Right. Didn't know that.
> You want "If BOOK1PL is not empty, return BOOK1PL, otherwise return
> BOOK1EN", correct?
>
> Then try this instead:
>
> SELECT IF(BOOK1PL <> '', BOOK1PL, B
Date: Wed, 17 Nov 2004 12:50:47 +0100
To: [EMAIL PROTECTED]
From: "Przemyslaw Popielarski" <[EMAIL PROTECTED]>
Subject: IF() problem
Message-ID: <[EMAIL PROTECTED]>
select IF(BOOK1PL,BOOK1PL,BOOK1EN)
from tBooksextra where ksi='id'
-> (content of BOOK1EN)
select BOOK1PL from tBooksextra
WHERE BOOK
