使用動態sql。
我剛剛創建了一個。不知道它有多高效。
查詢
declare @query1 varchar(max);
declare @query2 varchar(max);
select @query1 = 'select ' +
STUFF
(
(
select distinct
',min(t.Variable' + cast(Combination as varchar(6)) + ') as Variable' +
cast(Combination as varchar(6)) +
',min(t.Value' + cast(Combination as varchar(6)) + ') as Value' +
cast(Combination as varchar(6))
from tblComb
for xml path('')
),
1,1,'');
select @query1 += ' from('
select @query1 += 'select '+
stuff
(
(
select distinct
',max(case when Combination = ' + cast(Combination as varchar(6)) +'
then Variable end) as Variable' + cast(Combination as varchar(6)) +
',max(case when Combination = ' + cast(Combination as varchar(6)) +'
then Value end) as Value' + cast(Combination as varchar(6))
from tblComb
for xml path('')
),
1, 1, '');
select @query1 += ' from tblComb group by Combination, Variable)t union all ';
select @query2 = 'select ' +
STUFF
(
(
select distinct
',max(t.Variable' + cast(Combination as varchar(6)) + ') as Variable' +
cast(Combination as varchar(6)) +
',max(t.Value' + cast(Combination as varchar(6)) + ') as Value' +
cast(Combination as varchar(6))
from tblComb
for xml path('')
),
1, 1, '');
select @query2 += ' from('
select @query2 += 'select '+
stuff
(
(
select distinct
',max(case when Combination = ' + cast(Combination as varchar(6)) +'
then Variable end) as Variable' + cast(Combination as varchar(6)) +
',max(case when Combination = ' + cast(Combination as varchar(6)) +'
then Value end) as Value' + cast(Combination as varchar(6))
from tblComb
for xml path('')
),
1, 1, '');
select @query2 += ' from tblComb group by Combination, Variable)t;';
select @query1 += @query2;
execute(@query1);
樣品表
+-------------+----------+-------+
| Combination | Variable | Value |
+-------------+----------+-------+
| 0 | a | 1 |
| 0 | b | 2 |
| 1 | c | 3 |
| 1 | d | 4 |
| 2 | e | 5 |
| 2 | f | 6 |
+-------------+----------+-------+
結果集
+-----------+--------+-----------+--------+-----------+--------+
| Variable0 | Value0 | Variable1 | Value1 | Variable2 | Value2 |
+-----------+--------+-----------+--------+-----------+--------+
| a | 1 | c | 3 | e | 5 |
| b | 2 | d | 4 | f | 6 |
+-----------+--------+-----------+--------+-----------+--------+
將你的輸出始終包含固定數量的Ø f列? –
不,柱子的數量應該是組合數量的兩倍。 – xmamat
然後你將不得不去動態SQL路由。非動態SQL將始終返回固定數量的列。這意味着PIVOT不在桌面上。下面是@Ullas的一個很好的例子。 –