November 2006
Intermediate to advanced
168 pages
3h 17m
German
Content preview from MySQL: kurz & gut
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| CASE |
CASE Case-Ausdruck
WHEN When-Wert THEN Anweisungen
[WHEN When-Wert THEN Anweisungen] ...
[ELSE Anweisungen]
END CASE
CASE
WHEN Bedingung THEN Anweisungen
[WHEN Bedingung THEN Anweisungen] ...
[ELSE Anweisungen]
END CASE
Die CASE-Anweisung implementiert eine komplexe Bedingungsabfrage. Die beiden Syntaxformen ermöglichen unterschiedliche Verwendungsweisen. Bei der ersten Syntax wird der Case-Ausdruck ausgewertet und sein Ergebnis dann nacheinander mit den When-Werten der einzelnen WHEN-Klauseln verglichen. Wenn der Wert von Case-Ausdruck einem When-Wert entspricht, wird die entsprechende SQL-Anweisung ausgeführt. Bei der zweiten Syntaxform gibt es keinen festen Case-Ausdruck, mit dem Werte verglichen werden. Stattdessen werden nacheinander ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.