Question

我正在应用一个查询，我需要获得单个部门或所有部门的结果。

PersonID PersonName
1           'Abc'
2           'CDE'
3           'xyz'

DepartmentID   DepartmentName
1                   'Accounts'
2                   'Finance'

HirarchyID personID DepartmentID
1              1       1
2              1       1
3              2       1

现在我希望在我的sql查询中有一个参数传递为1 = 'Accounts', 2='Finance' and 0 = 'Both'

如何在查询中应用此@department参数？

我尝试应用案例，但它只会允许我使用帐户或财务..但不是两者。

select * from persons p join
Hierarchy h on h.PersonID = p.PersonID JOIN
Department d on d.DepartmentID = h.DepartmentID
where case ???

我的查询中的示例where子句是这样的：

WHERE        (sa.Area in (case when @myMode = 1 THEN 'abc Mode' 
                            when @myMode = 2 THEN 'XYZ Mode' 
                            ELSE
                            'abc Mode,xyz Mode'
                            END))

Answer 1

通过将变量作为in()：

的左侧提供来反转条件

select * from mytable
where @department in (DepartmentID, 0)

Answer 2

@DepartmentID is parameter that you are passing as "DepartmentID"

If(@DepartmentID=1)
begin
    --your code
    select * from Department  where DepartmentID  =1
end
else if(@DepartmentID=2)
begin

    --your code
    select * from Department  where DepartmentID  =2
end
else if(@DepartmentID=0)
begin

    select * from Department  where DepartmentID  in(1,2)

end

我希望这会有所帮助......

Answer 3

试试这个：

-- populate a temp table for demo purposes only
select *
into #departments
from (
    select 1 as DepartmentId, 'Accounts' as DepartmentName
    union all
    select 2 as DepartmentId, 'Finance' as DepartmentName
) as q1

declare @deptName nvarchar(50) = 'Accounts';
declare @deptId int = coalesce((
    select DepartmentId
    from #departments
    where DepartmentName = @deptName
),0);

select *
from #departments -- or dbo.someOtherTable ... which would make more sense
where @deptId in(DepartmentId,0)
go

这将仅返回Accounts部门的记录。

相反，如果您想要所有部门，请按以下步骤更改此行代码：

declare @deptName nvarchar(50) = '';

Answer 4

试试这个

SELECT  person_table.*
  FROM  person_table        ,
    department_table    ,
    heirarchy_table
 WHERE person_table.person_id       = heirarchy_table.person_id
   AND department_table.department_id   = heirarchy_table.department_id
   AND department_table.department_id = CASE WHEN (:PASSEDPARM = '0') THEN department_table.department_id
                                        ELSE :PASSEDPARM
                                        END;

使用db2语法

应用Case以从SQL获取所有记录

4 个答案: