order by 特殊排序技巧

if object_id('tempdb..#temp') is not null  
    drop table #temp  
  
create table #temp(col1 varchar(100), col2 varchar(100))  
insert into #temp  
select 'X68.23','4'  
union all select 'X86.32','2'  
union all select 'ZA11.30','1'  
union all select 'ZB11.47','1'  
go  
  
------ 需求一、按col 4，1，2排序  
-- 用 charindex  
select col1,col2 from #temp  
order by charindex(col2,'4,1,2')  
  
-- order by 中用 case  
select col1,col2 from #temp  
order by   
    case col2  
        when '4' then 1  
        when '1' then 2  
        when '2' then 3  
        else 3 + rand()  
    end  
  
-- 用 union  
select col1,col2 from #temp where col2 = '4' union all  
select col1,col2 from #temp where col2 = '1' union all  
select col1,col2 from #temp where col2 = '2'  
  
------ 需求二、 col 4 排第一，其余随便  
select col1,col2 from #temp  
order by   
    case col1  
        when '4' then 1  
        else 1 + rand()  
    end  
  
------ 需求三、 随机排序  
select col1,col2 from #temp  
order by newid()  

if object_id('tempdb..#temp') is not null
    drop table #temp

create table #temp(col1 varchar(100), col2 varchar(100))
insert into #temp
select 'X68.23','4'
union all select 'X86.32','2'
union all select 'ZA11.30','1'
union all select 'ZB11.47','1'
go

------ 需求一、按col 4，1，2排序
-- 用 charindex
select col1,col2 from #temp
order by charindex(col2,'4,1,2')

-- order by 中用 case
select col1,col2 from #temp
order by
    case col2
        when '4' then 1
        when '1' then 2
        when '2' then 3
        else 3 + rand()
    end

-- 用 union
select col1,col2 from #temp where col2 = '4' union all
select col1,col2 from #temp where col2 = '1' union all
select col1,col2 from #temp where col2 = '2'

------ 需求二、 col 4 排第一，其余随便
select col1,col2 from #temp
order by
    case col1
        when '4' then 1
        else 1 + rand()
    end

------ 需求三、 随机排序
select col1,col2 from #temp
order by newid()
ORDER BY		case when state=5 then 2 else 1 end ASC,	    weight_op_time DESC