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01.扩展/HandleUtils/sql/递归统计.sql

@@ -0,0 +1,39 @@
+WITH result (Id, ParentId, Category, Num)
+AS
+(
+	SELECT 1, 0, '<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1', 0
+	UNION ALL
+	SELECT 2, 1, '<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1-1',10
+	UNION ALL
+	SELECT 3, 1, '<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1-2', 10
+	UNION ALL
+	SELECT 4, 3, '<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1-2-1', 5 
+	UNION ALL
+	SELECT 5, 0, '<EFBFBD><EFBFBD><EFBFBD><EFBFBD>2', 5 
+	UNION ALL
+	SELECT 6, 0, '<EFBFBD><EFBFBD><EFBFBD><EFBFBD>3', 5 
+	UNION ALL
+	SELECT 7, 6, '<EFBFBD><EFBFBD><EFBFBD><EFBFBD>3-1', 5 
+	UNION ALL
+	SELECT 8, 4, '<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1-2-1-1', 5 
+),
+
+CTE(Id, ParentId, Category, Path, Num)
+As
+(
+  SELECT A.Id, A.ParentId, A.Category, CAST(A.Id As VARCHAR(MAX))+'->',A.Num 
+  FROM result A 
+  WHERE A.ParentId = 0
+  UNION ALL
+  SELECT B.Id, B.ParentId, B.Category,C.Path+CAST(B.Id As VARCHAR(MAX)) + '->', B.Num 
+  FROM result B
+  INNER JOIN CTE c on C.Id = B.ParentId
+)
+--SELECT * FROM CTE
+SELECT C.Id,
+C.Category,
+SUM(C1.Num) AS Num
+FROM CTE AS C
+--<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͳ<EFBFBD>Ʒ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD>ľ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>룺CHARINDEX
+INNER JOIN CTE AS C1 ON CHARINDEX(C.Path, C1.Path) = 1
+GROUP BY C.ID,C.Category