sql server - How To Query Order By Desc StartDate But NULLS First -


sql fiddle

create table [student_master] (    [user_id]        [int] identity (1, 1) not null constraint student_master_p_key primary key,    [name]           [varchar] (50),     [start_date]     [varchar] (50),    [priority]       [varchar] (50)  )  insert student_master values('john','2013-08-16','4') insert student_master values('jack','2013-08-10','') insert student_master values('mack','','1') insert student_master values('ack','2013-08-15','2')  //sql query  select row_number() on  (order case  when student_master.start_date null 1 when student_master.priority null 1  else 0 end,student_master.start_date desc ,student_master.priority desc )as rownumber,student_master.start_date student_master

how query order desc start date , null value first

demo

order    case when start_date = '' 0 else 1 end asc,   start_date desc

you use isnull, column not have null values - has empty strings intead.

and problem - because start_date column varchar, not datetime perform string, alphabetical sort instead of datetime sorting.


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