mysql 順序列找出斷號 SQL順序列找出斷號

select id from info

id(11 行受影響)

方法一：

select (select max(id)+1 from info where id

from info a

where

a.id>(select max(id)+1 from info where id

beginid     endid

4           4

9           9

13         14

(3 行受影響)

方法二：

select beginid,(select min(id)-1 from info where id > beginid) as endid

from (

select id+1 as beginid from info where id+1 not in (select id from info) and id < (select max(id) from info)

) as t

beginid     endid

4           4

9           9

13          14

(3 行受影響)

說明：1、查詢結果的兩列是斷號的區間，如果beginid=endid，則表示缺少該號碼，否則表示缺少beginid ~ endid；

2、如果號碼1不存在，區間1 ~ select min(id)-1 from info 將無法找出

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