What does ORDER BY 0 mean?
The order statement generates a 'virtual field' that contains NULL or 0 based on the case condition. The ORDER BY is applied based on that virtual field. The zero value in the order by precedes the NULL value. That's all, it's a way to set NULLs of the field1 at the end of the order list. Lees verder »
Bron: dba.stackexchange.com
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