如何获取自引用表的每个记录的所有子记录

Question

我有一个表格如下：

身份证 |儿童身份证 |名字        -----------------------             1 空名称12 1 名称23 2 名称34 3 名称45 4 名称56 5 名称67 6 名称78 7 名称89 8 名称910 9 名称1011 3 姓名11

现在我想要一个查询，它可以为至少有一个子级的每个记录获取所有可能的子项，并返回如下所示的数据集：

身份证 |家长编号 |  姓名 |  家长编号        -----------------------------------------             1 空名称1 11,10,9,8,7,6,5,4,3,22 1 姓名2 11,10,9,8,7,6,5,4,33 2 姓名3 11,10,9,8,7,6,5,44 3 姓名4 10,9,8,7,6,55 4 姓名5 10,9,8,7,66 5 姓名6 10,9,8,77 6 姓名7 10,9,88 7 姓名8 10,99 8 名称9 10

Answer 1

使用此查询。

更新结果： 小提琴手演示

    CREATE TABLE TABLE1 (ID INT, ParentID INT, NAME VARCHAR(10));
INSERT INTO TABLE1 VALUES(1, NULL, 'Name1');
INSERT INTO TABLE1 VALUES(2, 1, 'Name2');
INSERT INTO TABLE1 VALUES(3, 2, 'Name3');
INSERT INTO TABLE1 VALUES(4, 3, 'Name4');
INSERT INTO TABLE1 VALUES(5, 4, 'Name5');
INSERT INTO TABLE1 VALUES(6, 5, 'Name6');
INSERT INTO TABLE1 VALUES(7, 6, 'Name7');
INSERT INTO TABLE1 VALUES(8, 7, 'Name8');
INSERT INTO TABLE1 VALUES(9, 8, 'Name9');
INSERT INTO TABLE1 VALUES(10, 9, 'Name10');
INSERT INTO TABLE1 VALUES(11, 3, 'Name11');
  SELECT ID, ParentID , Name, Child = STUFF((
          SELECT ',' + CAST(B.ID AS VARCHAR(100)) FROm TABLE1 AS B 
          WHERE ISNULL(A.ID, 0) < B.ID AND B.ID NOT IN(
              ISNULL((SELECT TOP 1 C.ID FROm TABLE1 AS C 
                      WHERE C.ParentID IN (
                            SELECT ParentID FROM TABLE1 WHERE ID <= A.ID) 
                      ORDER BY C.ID DESC), 0))  
          ORDER BY B.ID DESC 
          FOR XML PATH (''), type).value('.', 'varchar(max)'), 1,1,'')
 FROm TABLE1 AS A

旧结果：

 SELECT ID, ParentID , Name, ParentIDs = STUFF((
  SELECT ',' + CAST(B.ID AS VARCHAR(100)) FROm MyTable AS B 
  WHERE ISNULL(A.ID, 0) < B.ID ORDER BY B.ID  DESC FOR XML PATH (''), type).value('.',
          'varchar(max)'), 1,1,'')
 FROm MyTable AS A

Answer 2

你可以尝试使用这个：

  SELECT a.*,x.ParentIDs
    FROM YourTable a
    CROSS APPLY (SELECT STUFF(CAST((SELECT ',' + CONVERT(VARCHAR,b.ID) 
    FROM YourTable b WHERE b.ID > a.ID AND ISNULL(b.ParentID,0) > ISNULL(a.ParentID,0) ORDER BY ID DESC
    FOR XML PATH(''), TYPE) AS VARCHAR(MAX)),1,1,'') AS ParentIDs ) x
    WHERE x.ParentIDs IS NOT NULL