The Ultimate Guide to High Availability with MariaDB

Comments - ORDER BY

6 years, 2 months ago Tadas Balaišis
Re: ORDER BY

Be aware with null values, they always come first. If you want "nulls last" order, you have to use additional pseudo-column, like this:

order by if(col is \N,1,0),col

 
2 months, 2 weeks ago Ingo Tomahogh-Willms
Re: ORDER BY

At least in MariaDB 10.5.8, NULL is ordered as lowest value.

Therefore,

ORDER BY -updated_at

and

ORDER BY updated_at DESC

are not the same if the updated_at (datetime) column contains some NULL values: The first one will sort NULLs first, the second one sorts NULL values last, while both sort actual datetimes in descending order.

 
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