sql-order-by

This question already has an answer here: Multiple Order By with LINQ [duplicate] 1 answer I want to order a List of objects in C# by many fields, not just by one. For example, let's suppose I have a class called X with two Attributes, A and B, and I have the following objects, in that order: object1 => A = "a", B = "h" object2 => A = "a", B = "c" object3 => A = "b", B = "x" object4 => A = "b", B = "b" and I want to order the list by A attribute first, and when they are equals, by B element, so the order would be: "a" "c" "a" "h" "b" "b" "b" "x" As far as I know, the OrderBy method order by

How can I order DESC by a field, but list the NULL values first? So I'm having a table: reuestId | offerId | offerTitle 1 | 1 | Alfa NULL | 2 | Beta 2 | 3 | Gamma I want to select them so that the results would be: NULL | 2 | Beta 2 | 3 | Gamma 1 | 1 | Alfa Try this: ORDER BY [reuestId] IS NULL DESC, [reuestId] DESC should work (for mySql) ypercubeᵀᴹ SELECT * FROM TableX ORDER BY (requestId IS NOT NULL) , requestId DESC 来源： https://stackoverflow.com/questions/9307613/mysql-order-by-null-first-and-desc-after

I have a problem with django queryset ordering. My model contains a field named position (a PositiveSmallIntegerField ), which I'd like to used to order query results. I use order_by('position') , which works great. Problem : my position field is nullable ( null=True, blank=True ), because I don't wan't to specify a position for every 50000 instances of my model :( When some instances have a NULL "position", order_by returns them in the top of the list : I'd like them to be at the end... In RAW SQL, I used to write things like " IF(position IS NULL or position='', 1, 0) " (see http://www

I need to order transaction based on the currency. However I need to implement a custom order by, which makes the USD to always comes on the top, and the rest should be ordered asc. for example : BHT USD MYR JYP should be sorted like : USD BHT JPY MYR Is there a simple way to handle this? Don't know if this qualifies as simple: order by case when currency = 'USD' then 1 when currency = 'BHT' then 2 when currency = 'JPY' then 3 when currency = 'MYR' then 4 else 5 end or a bit more compact but Oracle specific: order by decode(currency, 'USD', 1, 'BHT', 2, 'JPY', 3, 'MYR', 4, 5) The above