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  • 用公共表表达式完成一些对特殊部门的操作

    --题目:如下面, 求出所有顶级下的子级(仅子级,不含再下一级),要求是子级或者子级的下面不包含学校
    --顶级
    ------处长室
    ------------科长室0
    ------------科长室1
    ------宣传部
    ------科苑小学
    ------初中部
    ------------兰州中学
    ------高中部
    ------------兰州高中
    --1. 创建部门表及测试数据
    IF OBJECT_ID('Dep') IS NOT NULL
    BEGIN
    	DROP TABLE Dep
    END
    GO
    CREATE TABLE Dep(
    	id INT,
    	pId INT,
    	[name] VARCHAR(200),	
    	isSchool BIT	/*是否为学校*/
    )
    GO
    INSERT INTO Dep
    SELECT 1,0,'顶级',0 union
    SELECT 2,1,'处长室',0 union
    SELECT 3,2,'科长室0',0 union
    SELECT 4,2,'科长室1',0 union
    SELECT 5,1,'宣传部',0 union
    SELECT 6,1,'科苑小学',1 union
    SELECT 7,1,'初中部',0 union
    SELECT 8,7,'兰州中学',1 union
    SELECT 9,1,'高中部',1 union
    SELECT 10,9,'兰州高中',0
    
    --SELECT * FROM Dep d
    
    --2. 创建查询所有子级单位的函数
    IF OBJECT_ID('fn_getSubDep') IS NOT NULL
    BEGIN
    	DROP FUNCTION dbo.fn_getSubDep
    END
    GO
    
    CREATE FUNCTION fn_getSubDep( @depId INT )
    RETURNS TABLE
    AS
    RETURN(
    	WITH cte(id,pId,NAME,isSchool, level)
    	AS
    	(
    		SELECT id,pid,NAME,isSchool, 0
    		FROM Dep d WHERE id=@depId
    		UNION ALL
    		SELECT d2.id,d2.pid,d2.NAME,d2.isSchool, cte.[level]+1 
    		FROM Dep d2 JOIN cte ON d2.pid = cte.id	
    	)
    	SELECT * FROM cte
    )
    GO
    --SELECT * FROM dbo.fn_getSubDep(2)
    
    --3. 求出所有顶级下的子级(仅子级,不含再下一级),要求是子级或者子级的下面不包含学校
    WITH cte(id,pId,NAME,isSchool)
    AS
    (	
    	SELECT id,pId,NAME,isSchool FROM dbo.fn_getSubDep(1) t1
    	WHERE LEVEL=1 AND isSchool=0
    	AND NOT EXISTS(
    		SELECT 1 FROM dbo.fn_getSubDep(t1.id) WHERE isSchool=1	
    	)
    )
    SELECT * FROM cte


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  • 原文地址:https://www.cnblogs.com/pangblog/p/3239169.html
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