使用组合公用表表达式 https://msdn.microsoft.com/en-us/library/ms175972.aspx, outer apply() https://technet.microsoft.com/en-us/library/ms175156(v=sql.105).aspx, and dense_rank() https://msdn.microsoft.com/en-us/library/ms173825.aspx
注意:我更改了列Key
to tKey
所以我不必在它周围使用方括号。
;with cte as (
select *
, PrevTransactionType=isnull(x.Prev_TransactionType,'Consume')
from t
outer apply (
select top 1
Prev_TransactionType = TransactionType
from t as i
where i.tKey < t.tKey
order by i.tKey desc
) as x
)
select t.tKey, t.LotId, t.TransactionType, t.Quantity, t.Destination
, Grouping = LotId + convert(varchar(10),dense_rank() over (
partition by LotId
order by GroupNumber
)
)
from cte as t
outer apply (
select top 1
GroupNumber = i.tKey
from cte as i
where i.tKey <= t.tKey
and i.TransactionType = 'Transform'
and i.PrevTransactionType = 'Consume'
order by i.tKey desc
) x
测试设置:http://rextester.com/LWV40248 http://rextester.com/LWV40248
results:
+------+-------+-----------------+----------+-------------+----------+
| tKey | LotId | TransactionType | Quantity | Destination | Grouping |
+------+-------+-----------------+----------+-------------+----------+
| 1 | A | Transform | NULL | Foo | A1 |
| 2 | A | Transform | NULL | Bar | A1 |
| 3 | A | Consume | 100 | NULL | A1 |
| 4 | B | Transform | NULL | Bob | B1 |
| 5 | B | Transform | NULL | Fred | B1 |
| 6 | B | Consume | 75 | NULL | B1 |
| 7 | B | Consume | 50 | NULL | B1 |
| 8 | B | Transform | NULL | Sally | B2 |
| 9 | B | Transform | NULL | Fred | B2 |
| 10 | B | Consume | 60 | NULL | B2 |
| 11 | C | Transform | NULL | Bar | C1 |
| 12 | C | Transform | NULL | Fred | C1 |
| 13 | C | Consume | 25 | NULL | C1 |
+------+-------+-----------------+----------+-------------+----------+