小编TMi*_*man的帖子

考虑下表，

CREATE TABLE GapsIslands (ID INT NOT NULL, SeqNo INT NOT NULL);

ALTER TABLE GapsIslands ADD CONSTRAINT pk_GapsIslands PRIMARY KEY (ID, SeqNo);

INSERT INTO GapsIslands
SELECT 1, 1 UNION ALL SELECT 1, 2 UNION ALL SELECT 1, 5 UNION ALL SELECT 1, 6 
UNION ALL SELECT 1, 8 UNION ALL SELECT 1, 9 UNION ALL SELECT 1, 10 UNION ALL SELECT 1, 12 
UNION ALL SELECT 1, 20 UNION ALL SELECT 1, 21 UNION ALL SELECT 1, 25 UNION ALL …