选择范围个数

Question

查询的：

SELECT nummer 
    FROM tabell_med_nummer 
    WHERE SUBSTR(nummer, -1) = 0 

此查询选择表tabell_med_nummer一个数，即用“0”结束。例如，它将选择1000,1010,1020，但不是1001,1002等。

我需要基于此得到一个范围。例如1000-1100或1010-1023。范围的大小是可变的。它的结尾并不重要，但它必须选择一个以1010结尾为“0”的数字。

棘手的部分是并非每个数字都存在于表格中。所以如果表中不存在1004，结束我需要100的范围，它不能从1000开始。

有没有人知道我该如何解决这个问题？

按照要求：

+----+-------------+-------+-------+-------------------------------+---------------+---------+------+------+---------------------------------+ 
| id | select_type | table | type | possible_keys     | key   | key_len | ref | rows | Extra       | 
+----+-------------+-------+-------+-------------------------------+---------------+---------+------+------+---------------------------------+ 
| 1 | SIMPLE  | f  | ALL | NULL       | NULL   | NULL | NULL | 19 | Using temporary; Using filesort | 
| 1 | SIMPLE  | t2 | index | telefonnummer,telefonnummer_2 | telefonnummer | 5  | NULL | 1001 | Using index; Using join buffer | 
| 1 | SIMPLE  | p  | ALL | NULL       | NULL   | NULL | NULL | 4568 | Using where; Using join buffer | 
| 1 | SIMPLE  | t3 | index | telefonnummer,telefonnummer_2 | telefonnummer | 5  | NULL | 1001 | Using index; Using join buffer | 
| 1 | SIMPLE  | t1 | ALL | telefonnummer,telefonnummer_2 | NULL   | NULL | NULL | 1001 | Using where; Using join buffer | 
+----+-------------+-------+-------+-------------------------------+---------------+---------+------+------+---------------------------------+ 
5 rows in set (0.00 sec) 

我改变了一些表和字段名称，并增加了一些连接并在statments：

SELECT t1.telefonnummer start, t2.telefonnummer end, t1.kundenummer kundenummer, t1.fornavn fornavn, t1.etternavn etternavn, t1.bedriftsnavn bedriftsnavn, t1.organisasjonsnummer organisasjonsnummer, t1.partnerID partnerID 

FROM TELEFONNUMMERTILDELING t1 

JOIN TELEFONNUMMERTILDELING t2 
ON t1.telefonnummer % 10 = 0 
AND t1.telefonnummer <= t2.telefonnummer 

JOIN TELEFONNUMMERTILDELING t3 
ON t3.telefonnummer BETWEEN t1.telefonnummer AND t2.telefonnummer 

JOIN TELEFONNUMMERTILDELING_POSTNUMMER p 
ON p.postnummer = 4085 

JOIN TELEFONNUMMERTILDELING_FYLKE f 
ON f.ID = p.fylkeID GROUP BY start, end 

HAVING end - start + 1 = COUNT(*) 
AND end - start + 1 = 50 
AND (kundenummer IS NULL OR kundenummer = '') 
AND (fornavn IS NULL OR fornavn = '') 
AND (etternavn IS NULL OR etternavn = '') 
AND (bedriftsnavn IS NULL OR bedriftsnavn = '') 
AND (organisasjonsnummer IS NULL OR organisasjonsnummer = '') 
AND partnerID = 1001 

Answer 1

-- get the start and end points 
SELECT t1.nummer AS start, t2.nummer AS end 

-- pair every possible start number with every potential end number 
FROM  tabell_med_nummer t1 
    JOIN tabell_med_nummer t2 
     ON t1.nummer % 10 = 0 AND t1.nummer <= t2.nummer 

-- obtain every number in between 
    JOIN tabell_med_nummer t3 
     ON t3.nummer BETWEEN t1.nummer AND t2.nummer 

-- group into potential ranges 
GROUP BY start, end 

-- now limit only to contiguous ranges 
    HAVING end - start + 1 = COUNT(*) 

-- and those that contain the desired number of records 
    AND end - start + 1 = ? 

如果nummer不能保证是唯一的，例如有UNIQUE约束，那么您将需要用性能较低的COUNT(DISTINCT t3.nummer)替换COUNT(*)，或者用(SELECT DISTINCT nummer FROM tabell_med_nummer)替换t3。

Answer 2

在WHERE条款添加另一个条件。

SELECT nummer 
    FROM tabell_med_nummer 
    WHERE SUBSTR(nummer, -1) = 0 AND 
     nummer BETWEEN 1000 AND 1100