Question

我正在尝试从一个表中检索数据，然后将其插入另一个表中。这是第一个表的示例，其中包含以下数据。 tb1是由数据组成的表。 Manager和TeamLeader这两个列基本上意味着：例如：Josh由Vik管理，依此类推。员工也可以是另一个雇主的经理。例如，Josh是Nirvan和Deva的经理。

+---------+-------------+
|        tbl1           |
+---------+-------------+
| Manager | Employee    |
+---------+-------------+
| Vik     | Josh        |
+---------+-------------+
| Vik     | Cindy       |
+---------+-------------+
| Vik     | Alvin       |
+---------+-------------+
| Vik     | Kim         |
+---------+-------------+
| Josh    | Nirvan      |
+---------+-------------+
| Josh    | Deva        |
+---------+-------------+
| Cindy   | Mervyn      |
+---------+-------------+
| Nirvan  | Reeta       |
+---------+-------------+
| Nirvan  | Zaki        |
+---------+-------------+
| Nirvan  | Sunny       |
+---------+-------------+

我想要的是将所有这些记录插入到具有以下列的另一个表中：Id（设置为IDENTITY / AUTONUM），Name（员工/经理的姓名），ParentId（特定员工拥有的经理）报告）。所以，例如，我应该得到类似的东西：

ID Name ParentId
1  Vik    0
2  Josh   1
3  Cindy  1
4  Alvin  1
5  Kim    1
6  Nirvan 2
7  Deva   2
8  Mervyn 3
9  Reeta  6
10 Zaki   6
11 Sunny  6

我很难获得正确的sql从第一个表中检索此数据并将其插入另一个表中。

Answer 1

你必须分两步完成。一个用于创建所有ID字段。然后，您可以加入此表格以匹配员工，以找到经理和经理的ID：

insert into MyNewTable (Name, ParentID)
select Manager, ParentID
from tbl1
union
select Employee, ParentID 
from tbl1

update MyNewTable
set MyNewTable.ParentId = Managers.Id
from MyNewTable
join tbl1
on tbl1.Employee = MyNewTable.Name
join MyNewTable Managers
on MyNewTable.Name = Managers.Manager

Answer 2

INSERT INTO tbl2 (
    Name
    ,parentId
    )
SELECT DISTINCT manager
    ,0
FROM tbl1
WHERE manager NOT IN (
        SELECT employee
        FROM tbl1
        )

INSERT INTO tbl2
SELECT DISTINCT employee
    ,0
FROM tbl1

UPDATE tbl2
SET parentid = parent.id
FROM tbl2
INNER JOIN tbl1 ON tbl2.Name = tbl1.employee
INNER JOIN tbl2 parent ON parent.Name= tbl1.manager

Answer 3

create table #tbl1 (manager char(15), employee char(15))

create table #tbl2 (ID int identity(1,1), Name char(15), ParentID int)

 insert into #tbl1
 values ('Vik', 'Josh') ,
('Vik'     , 'Cindy')  ,
('Vik'     , 'Alvin') ,
('Vik'     , 'Kim')   ,
('Josh'    , 'Nirvan'),
('Josh'    , 'Deva') ,
('Cindy'   ,'Mervyn')  ,
('Nirvan'  , 'Reeta'),
('Nirvan'  , 'Zaki'),
('Nirvan'  , 'Sunny')

--- big Boss 
insert into #tbl2(Name, ParentID)
SELECT DISTINCT manager, 0
FROM #tbl1
WHERE manager NOT IN ( SELECT employee FROM #tbl1  )

--- Grab all Employees (Name)
insert into #tbl2(Name)
select distinct employee from #tbl1

--- Update ParentID 
declare @StructureLevl int = 3  -- 0 1 2 3  Do something to figure out this number first
declare @Var_int int = 0
while (@Var_int < @StructureLevl)
begin
    update #tbl2 
    set ParentID= @Var_int +1
    where Name in (select A.employee 
                    from #tbl1 A inner join #tbl2 B on A.manager = B.Name 
                    where B.ParentID = @Var_int)

    set @Var_int +=1
end

select * from #tbl2
order by ParentID

从一个表中检索数据并插入另一个表

3 个答案: