SQL을 사용하여 무방향 그래프에서 연결된 모든 하위 그래프를 찾는 방법은 무엇입니까?

<code class="sql">WITH
CTE_Idents
AS
(
    SELECT DISTINCT
        CASE WHEN Ident1 IS NOT NULL THEN Ident1 ELSE Ident2 END AS Ident
    FROM EdgeTable
),
CTE_Pairs
AS
(
    SELECT Ident1, Ident2
    FROM EdgeTable
),
CTE_Recursive
AS
(
    SELECT
        CAST(AnchorIdent AS VARCHAR(8000)) AS AnchorIdent,
        Ident1,
        Ident2,
        CAST(',' + Ident1 + ',' + Ident2 + ',' AS VARCHAR(8000)) AS IdentPath,
        1 AS Level
    FROM CTE_Pairs
    INNER JOIN CTE_Idents ON CTE_Idents.Ident = CTE_Pairs.Ident1
    UNION ALL
    SELECT
        CTE_Recursive.AnchorIdent,
        CTE_Pairs.Ident1,
        CTE_Pairs.Ident2,
        CAST(CTE_Recursive.IdentPath + CTE_Pairs.Ident2 + ',' AS VARCHAR(8000)) AS IdentPath,
        CTE_Recursive.Level + 1
    FROM CTE_Pairs
    INNER JOIN CTE_Recursive ON CTE_Recursive.Ident2 = CTE_Pairs.Ident1
    WHERE CTE_Recursive.IdentPath NOT LIKE CAST('%,' + CTE_Pairs.Ident2 + ',%' AS VARCHAR(8000))
)
SELECT
    CTE_Idents.Ident,
    CASE WHEN CA_Data.XML_Value IS NULL THEN CTE_Idents.Ident ELSE CA_Data.XML_Value END AS GroupMembers,
    DENSE_RANK() OVER(ORDER BY CASE WHEN CA_Data.XML_Value IS NULL THEN CTE_Idents.Ident ELSE CA_Data.XML_Value END) AS GroupID
FROM CTE_Idents
CROSS APPLY
(
    SELECT CTE_CleanResult.Ident + ','
    FROM CTE_CleanResult
    WHERE CTE_CleanResult.AnchorIdent = CTE_Idents.Ident
    ORDER BY CTE_CleanResult.Ident FOR XML PATH(''), TYPE
) AS CA_XML(XML_Value)
CROSS APPLY
(
    SELECT CA_XML.XML_Value.value('.', 'NVARCHAR(MAX)')
) AS CA_Data(XML_Value)
WHERE CTE_Idents.Ident IS NOT NULL
ORDER BY Ident;</code>