SQL查询连续号码段的巧妙解法
SQL查询连续号码段的巧妙解法
在ITPUB上有一则非常巧妙的SQL技巧，学习一下，记录在这里。最初的问题是这样的:
我有一个表结构，
fphm,kshm
2014,00000001
2014,00000002
2014,00000003
2014,00000004
2014,00000005
2014,00000007
2014,00000008
2014,00000009
2013,00000120
2013,00000121
2013,00000122
2013,00000124
2013,00000125
(第二个字段内可能是连续的数据，可能存在断点。)
怎样能查询出来这样的结果,查询出连续的记录来。
就像下面的这样？
2014,00000001,00000005
2014,00000009,00000007
2013,00000120,00000122
2013,00000124,00000125
ITPUB上的朋友给出了一个非常巧妙的答案:
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) a
) b
GROUP BY b.fphm, b.cc
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