这是以下问题:Prepare a recursive query
我有两个列的表,即cola和colb,如下所示:
表:测试
create table Test
(
cola int,
colb int
);
我输入的记录是:
Cola Colb
------------
1 2
1 3
1 4
2 5
2 6
2 3
3 2
3 4
3 7
3 10
10 11
11 12
11 13
11 14
12 15
13 16
14 99
15 88
16 77
注意:现在我想显示与我已通过的值相关联的唯一记录。例如,如果我将值传递为1,那么它应该向我显示连接的数字,并形成像树一样的连接。
对于上述要求,我从Dark Knight获得了如下所示的脚本,效果很好。
;WITH CTE AS
(
SELECT COLA,COLB,','+CAST(COLA AS VARCHAR(MAX))+',' AS CHCK FROM test WHERE COLA=1
UNION ALL
SELECT C1.COLA,C1.COLB,C.CHCK+CAST(C1.cola AS VARCHAR(MAX))+','
FROM CTE C INNER JOIN test C1 ON C.colb = C1.cola
WHERE CHARINDEX(','+CAST(C.colb AS VARCHAR(MAX))+',',C.CHCK)=0
),
OUTERCTE AS
(
SELECT DISTINCT COLA,COLB,ROW_NUMBER() OVER(PARTITION BY Colb ORDER BY Cola) rn FROM CTE --ORDER BY COLA
)
SELECT Cola,Colb FROM OUTERCTE
WHERE rn<=1
ORDER BY CASE WHEN Cola = 1 THEN 1 ELSE 2 END;
这给了我这个:
----------------
Cola Colb
----------------
1 2
1 3
1 4
2 5
2 6
3 7
3 10
10 11
11 12
11 13
11 14
12 15
13 16
16 77
15 88
14 99
要求:现在我想显示记录的级别。
预期结果:
------------------------------
Cola Colb Level
------------------------------
1 2 1
1 3 1
1 4 1
2 5 2
2 6 2
3 7 2
3 10 2
10 11 3
11 12 4
11 13 4
11 14 4
12 15 5
13 16 5
16 77 6
15 88 6
14 99 5
答案 0 :(得分:2)
private void textBox1_KeyPress( object sender, KeyPressEventArgs e )
{
if( !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar) )
e.Handled = true;
}