180. 连续出现的数字 SELECT DISTINCT if(a.num b.num AND b.num c.num,a.num,null) AS ConsecutiveNums
FROM Logs a
LEFT OUTER JOIN Logs b
ON a.id1 b.id
LEFT OUTER JOIN Logs c
ON a.id2 c.id
WHERE if(a.num b.num AND b.num c.num,a.num,null) IS NOT NULL603. 连…
在软件工程领域,设计模式是解决常见设计问题的经典方案。1994 年,Erich Gamma、Richard Helm、Ralph Johnson 和 John Vlissides(四人帮,GoF)在《设计模式:可复用面向对象软件的基础》一书中系统性地总结了…