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Clever solution for SQL query of continuous number segments

Source: Internet
Author: User
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There is a clever SQL technique on itpub. Learn it and record it here.
The initial problem was as follows:
I have a table structure,
Fphm, kshm
Int32 00000001
Int32 00000002
Int32 00000003
Int32 00000004
Int32 00000005
Int32 00000007
Int32 00000008
Int32 00000009
Maid
Maid
Maid
Maid
Maid
(The second field may contain continuous data and may contain breakpoints .)
How can we query such results and query continuous records.
As shown below?
Int32 00000001, 00000005
00000007
Maid, 00000122
00000125
A friend on itpub gave a very clever answer:
Select B. fphm, min (B. kshm) start_hm, max (B. kshm) end_hm
From (select a. *, to_number (A. kshm-rownum) CC
From (select *
From t
Order by fphm, kshm)
) B
Group by B. fphm, B. CC

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Related Keywords:
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