獲取所有孩子的單親家庭中的單個行

Question

讓我們asume我在SQL父子結構安裝（服務器2005年）：

CREATE TABLE parent (Id INT IDENTITY PRIMARY KEY, Name VARCHAR(255)) 
CREATE TABLE child (Id INT IDENTITY PRIMARY KEY, parentId INT, Name VARCHAR(255)) 

insert into parent select 'parent with 1 child' 
insert into parent select 'parent with 2 children' 

insert into child(name, parentid) select 'single child of parent 1', 1 
insert into child(name, parentid) select 'child 1 of 2 of parent 2', 2 
insert into child(name, parentid) select 'child 2 of 2 of parent 2', 2 

有沒有辦法爲每個父母返回一行與它的孩子作爲列？像：

parent.Id，parent.Name，兒童（1）.ID，兒童（1）.name和兒童（2）.ID，兒童（2），請將.Name

與入門出來：

select * from parent p 
    left outer join child c1 on c1.parentid = p.id 

Answer 1

你舉的例子是接近旋轉，但我不認爲透視功能是在這一個可用。

我已將您的示例重命名爲使用「部門 - 人員」，而不是「孩子父母」，只是爲了保持我的理智。

所以，第一表和一些數據

DECLARE @Department TABLE 
    ( 
    DepartmentID int 
    ,DepartmentName varchar(50) 
) 
DECLARE @Person TABLE 
    ( 
    PersonID int 
    ,PersonName varchar(50) 
    ,DepartmentID int 
) 

INSERT INTO @Department 
    (DepartmentID, DepartmentName) 
SELECT 1, 'Accounting' UNION 
SELECT 2, 'Engineering' UNION 
SELECT 3, 'Sales' UNION 
SELECT 4, 'Marketing' ; 

INSERT INTO @Person 
    (PersonID, PersonName, DepartmentID) 
SELECT 1, 'Lyne', 1 UNION 
SELECT 2, 'Damir', 2 UNION 
SELECT 3, 'Sandy', 2 UNION 
SELECT 4, 'Steve', 3 UNION 
SELECT 5, 'Brian', 3 UNION 
SELECT 6, 'Susan', 3 UNION 
SELECT 7, 'Joe', 4 ; 

現在我想扁平化模型，我將使用臨時表，因爲我有表變量 - 但「真正的表」視圖將是一件好事太。

/* Create a table with: 
    DepartmentID, DepartmentName, PersonID, PersonName, PersonListIndex 

This could be a view instead of temp table. 
*/ 
IF object_id('tempdb.dbo.#tmpTbl','U') IS NOT NULL 
DROP TABLE #tmpTbl 

; 
WITH prs 
     AS (SELECT PersonID 
        ,PersonName 
        ,DepartmentID 
        ,row_number() OVER (PARTITION BY DepartmentID ORDER BY PersonID) AS [PersonListIndex] 
      FROM @Person 
      ), 
     dptprs 
     AS (SELECT d.DepartmentID 
        ,d.DepartmentName 
        ,p.PersonID 
        ,p.PersonName 
        ,p.PersonListIndex 
      FROM @Department AS d 
        JOIN prs AS p ON p.DepartmentID = d.DepartmentID 
      ) 
SELECT * INTO #tmpTbl FROM dptprs 

-- SELECT * FROM #tmpTbl 

動態列指動態查詢，我將撰寫這行到行插入表

/* Table to compose dynamic query */ 
DECLARE @qw TABLE 
    ( 
    id int IDENTITY(1, 1) 
    ,txt nvarchar(500) 
) 

/* Start composing dynamic query */ 
INSERT INTO @qw (txt) VALUES ('SELECT') 
INSERT INTO @qw (txt) VALUES ('[DepartmentID]') 
INSERT INTO @qw (txt) VALUES (',[DepartmentName]') ; 


/* fetch max number of employees in a department */ 
DECLARE @i int ,@m int 
SET @m = (SELECT max(PersonListIndex) FROM #tmpTbl) 

/* Compose dynamic query */ 
SET @i = 1 
WHILE @i <= @m 
    BEGIN 
     INSERT INTO @qw (txt) 
      SELECT ',MAX(CASE [PersonListIndex] WHEN ' 
        + cast(@i AS varchar(10)) + ' THEN [PersonID] ELSE NULL END) AS [Person_' 
        + cast(@i AS varchar(10)) + '_ID]' 

     INSERT INTO @qw (txt) 
      SELECT ',MAX(CASE [PersonListIndex] WHEN ' 
        + cast(@i AS varchar(10)) + ' THEN [PersonName] ELSE NULL END) AS [Person_' 
        + cast(@i AS varchar(10)) + '_Name]' 

    SET @i = @i + 1 
    END 

/* Finish the dynamic query */ 
INSERT INTO @qw (txt) VALUES ('FROM #tmpTbl') 
INSERT INTO @qw (txt) VALUES ('GROUP BY [DepartmentID], [DepartmentName]') 
INSERT INTO @qw (txt) VALUES ('ORDER BY [DepartmentID]') 

-- SELECT * FROM @qw 

現在連接所有查詢行到一個變量，並執行

/* Create a variable with dynamic sql*/ 
DECLARE @exe nvarchar(4000) 
SET @exe='' 
SELECT @exe = @exe + txt + ' ' FROM @qw ORDER BY id 

/* execute dynamic sql */ 
EXEC master..sp_executesql @exe 

這裏是結果：

alt text http://www.damirsystems.com/dp_images/morepivot_result_01.png

Answer 2

look at the pivot functionality if you use sql server 2005

Answer 3

嘗試用動態樞轉

測試數據

declare @parent table (Id INT IDENTITY PRIMARY KEY, Name VARCHAR(255)) 
declare @child table (Id INT IDENTITY PRIMARY KEY, parentId INT, Name VARCHAR(255)) 

insert into @parent select 'parent with 1 child' 
insert into @parent select 'parent with 2 children' 
insert into @child(name, parentid) select 'single child of parent 1', 1 
insert into @child(name, parentid) select 'child 1 of 2 of parent 2', 2 
insert into @child(name, parentid) select 'child 2 of 2 of parent 2', 2 

查詢

declare @col_list varchar(max) 
declare @dynquery nvarchar(max) 
select 
c.Id as ChildId 
, p.Id as ParentId 
,p.Name as ParentName 
,c.Name as ChildName 
into #t from @parent p join @child c on p.Id = c.parentId 
select @col_list = stuff(cols,1,1,'') from 
(select distinct ',[' + cast(ChildName as varchar(50)) + ']' 
from #t for xml path(''))X(cols) 
set @dynquery = 'select * from #t pivot (max(ChildId) for ChildName in (' + @col_list + ') ' + ') as pvt' 
EXEC master..sp_executesql @dynquery 
drop table #t 

輸出：

ParentId ParentName child 1 of 2 of parent 2 child 2 of 2 of parent 2 single child of parent 1 
1 parent with 1 child NULL NULL 1 
2 parent with 2 children 2 3 NULL 

Answer 4

如果你想有一個不同的外觀試試這個

的樣本數據

declare @parent table (Id INT IDENTITY PRIMARY KEY, Name VARCHAR(255)) 
declare @child table (Id INT IDENTITY PRIMARY KEY, parentId INT, Name VARCHAR(255)) 

insert into @parent select 'parent with 1 child' 
insert into @parent select 'parent with 2 children' 
insert into @child(name, parentid) select 'single child of parent 1', 1 
insert into @child(name, parentid) select 'child 1 of 2 of parent 2', 2 
insert into @child(name, parentid) select 'child 2 of 2 of parent 2', 2 

查詢

select p.Id as ParentId,p.Name as ParentName 
    ,stuff((select ', ' + 'child(' + cast(c.Id as varchar(10)) + ') : ' + c.Name 
    from @child c where c.parentId = p.id for xml path('')),1,1,'') 'Child(id):Child Names' 
    from @parent p 
group by 
p.Id,p.Name 

輸出

ParentId ParentName Child(id):Child Names 
1 parent with 1 child child(1) : single child of parent 1 
2 parent with 2 children child(2) : child 1 of 2 of parent 2, child(3) : child 2 of 2 of parent 2 

Answer 5

看着達米爾Sudarevic的回答後，我想出了這個：（見我的表結構問題）

declare @family table (parentid int , parentname varchar(255), child1id int, child1name varchar(255), child2id int, child2name varchar(255)) 

insert into @family(parentid, parentname) 
select id, name from parent 

update @family set child1id = c.id, child1name = c.name 
from @family f, child c 
where c.parentid = f.parentid 

update @family set child2id = c.id, child2name = c.name 
from @family f, child c 
where c.parentid = f.parentid 
and not exists 
    (select child1id from @family where child1id = c.id) 

select * from @family