Animal Count Color
------ ----- -----
Dog 2 brown
Cat 4 black
Result
Animal Color
------
Dog brown
Dog brown
Cat black
Cat black
Cat black
Cat black
答案 0 :(得分:6)
您可以使用以下Common Table Expression
来实现它:
CREATE TABLE #Test
(
Animal NVARCHAR(20),
CountAnimals INT,
Color NVARCHAR(20)
)
INSERT INTO #Test VALUES ('Dog', 2, 'brown'), ('Cat', 4, 'black');
WITH CTE AS (
SELECT Animal,CountAnimals,Color FROM #Test
UNION ALL
SELECT Animal,CountAnimals-1,Color
FROM CTE
WHERE CountAnimals >= 2
)
SELECT Animal,Color
FROM CTE
ORDER BY Animal DESC
OPTION (MAXRECURSION 0);
DROP TABLE #Test
<强>输出
Animal Color
Dog brown
Dog brown
Cat black
Cat black
Cat black
Cat black
<强> SQL FIDDLE
答案 1 :(得分:2)
您需要在初始表中引入一个人工表(或视图)the_row_holder_table,行数> gt = = max count。然后只是
select gr.Animal, gr.Color
from grouped gr
join the_row_holder_table on gr.count<the_row_holder_table.row
更新:
假设the_row_holder_table只有一列row
,其值为
row
-----
1
2
3
...
然后连接分组表的每一行(通过the_row_holder_table表的gr.countcount行
答案 2 :(得分:1)
你可以这样做:
测试数据:
DECLARE @tbl TABLE(Animal varchar(100), Count INT, Color VARCHAR(100))
INSERT INTO @tbl
VALUES
('Dog',2,'brown'),
('Cat',4,'black')
使用递归cte + cross apply。你可以这样做:
DECLARE @max INT=(SELECT MAX(Count) FROM @tbl);
;WITH Nbrs ( n ) AS (
SELECT 1 UNION ALL
SELECT 1 + n FROM Nbrs WHERE n < @max )
SELECT
t.Animal,
t.Count,
t.Color
FROM
@tbl as t
CROSS APPLY
(
SELECT * FROM Nbrs WHERE Nbrs.n<=t.Count
) AS f
ORDER BY t.Animal DESC
<强>输出
Dog 2 brown
Dog 2 brown
Cat 4 black
Cat 4 black
Cat 4 black
Cat 4 black
答案 3 :(得分:0)
declare @ints table(ID int)
declare @animals table(animal varchar(20),[count] int,color varchar(20))
insert into @animals values ('Dog', 2 ,'brown'),('Cat', 4 ,'black')
declare @int int = 1
declare @maxInt int = (SELECT MAX([count]) from @animals)
while @int <= @maxInt
BEGIN
INSERT INTO
@ints
VALUES
(@int)
SET @int = @int + 1
END
SELECT
animal,
color
FROM
@animals a
INNER JOIN @ints i ON i.ID <=a.[count]
ORDER BY
animal ASC
答案 4 :(得分:-1)
WITH CTE AS (
SELECT animal,count,color FROM tes
UNION ALL
SELECT animal,count-1,color
FROM CTE
WHERE count > 1
)
SELECT animal,color
FROM CTE
group by animal,color