Question

我有很多数据，为了示例目的，请提供以下数据

    d1  date                        OL
    N   2012-03-09 00:00:00.000     NULL
    No  2011-09-26 00:00:00.000     OL
    N   2012-01-26 00:00:00.000     NOL
    N   2012-03-07 00:00:00.000     NOL
    yes 2012-02-23 00:00:00.000     NULL

我需要像是

Create proc dbo.usp_all_property_search
(@type varchar(2))
as
begin
select * from tbl where ol is
select case @type
when 'o' then null
else
not null
end

end

Plz帮帮我。

Answer 1

你过度复杂了：

SELECT *
FROM Tbl
WHERE (@type = 'o' AND ol IS NULL)
OR (@Type <> 'o' AND ol IS NOT NULL)

Answer 2

select * from tbl
where (@type = 'o' and ol is null) OR
    (@type <> 'o' and ol is not null)

Answer 3

我想你想要这个：

select * from tbl where (@type = 'o' and ol is null) or (@type != 'o' and ol is not null)

Case 表达式必须返回值，而SQL Server甚至不支持布尔数据类型。

Answer 4

这有用吗？

Create proc dbo.usp_all_property_search
(@type varchar(2))
as
begin
select * from tbl 
where (@type = 'o' and ol is null)
OR (@type != 'o' AND ol is not null)

end

Answer 5

Create proc dbo.usp_all_property_search(@type varchar(2))
as
begin
  select * 
  from tbl 
  where 
     ( @type = 'o' and
       ol is null)        or
     ( @type != 'o' and
       ol is not null);
end

来自select的case为null

5 个答案: