https://blog.youkuaiyun.com/maeleezh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/maelee/article/details/128106131https://blog.youkuaiyun.com/maelee/article/details/128106131maeleeFri, 09 Dec 2022 20:53:21 +0800https://blog.youkuaiyun.com/maelee/article/details/127078442https://blog.youkuaiyun.com/maelee/article/details/127078442maeleeTue, 29 Nov 2022 21:41:31 +0800https://blog.youkuaiyun.com/maelee/article/details/127756752https://blog.youkuaiyun.com/maelee/article/details/127756752maeleeTue, 29 Nov 2022 21:39:14 +0800与=类似，唯一区别是可以对NULL进行判断，当两个操作数均为NULL，其值返回为1，而不为NULL；OR可以和AND一起使用，但是在使用时要注意两者的优先级，由于AND的优先级高于OR，因此先对AND两边的操作数进行操作，再与OR中的操作数结合。比较运算符用来对表达式左边的操作数和右边的操作数进行比较，比较的结果为真则返回1，比较的结果为假则返回0，其他情况则返回NULL。当一个值为NULL，并且另一个值为非0值时，返回1，否则返回NULL；如果一个值为0，另一个值不为0时，则返回1。]]>https://blog.youkuaiyun.com/maelee/article/details/127562148https://blog.youkuaiyun.com/maelee/article/details/127562148maeleeMon, 07 Nov 2022 16:29:07 +0800https://blog.youkuaiyun.com/maelee/article/details/127528201https://blog.youkuaiyun.com/maelee/article/details/127528201maeleeWed, 26 Oct 2022 22:42:02 +0800https://blog.youkuaiyun.com/maelee/article/details/126768176https://blog.youkuaiyun.com/maelee/article/details/126768176maeleeThu, 08 Sep 2022 18:12:13 +0800https://blog.youkuaiyun.com/maelee/article/details/125359818https://blog.youkuaiyun.com/maelee/article/details/125359818maeleeSun, 17 Jul 2022 13:20:19 +0800https://blog.youkuaiyun.com/maelee/article/details/125830650https://blog.youkuaiyun.com/maelee/article/details/125830650maeleeSun, 17 Jul 2022 13:06:37 +0800https://blog.youkuaiyun.com/maelee/article/details/125339628https://blog.youkuaiyun.com/maelee/article/details/125339628maeleeFri, 17 Jun 2022 21:40:56 +0800https://blog.youkuaiyun.com/maelee/article/details/125297416https://blog.youkuaiyun.com/maelee/article/details/125297416maeleeThu, 16 Jun 2022 22:12:34 +0800https://blog.youkuaiyun.com/maelee/article/details/125188563https://blog.youkuaiyun.com/maelee/article/details/125188563maeleeWed, 15 Jun 2022 14:59:28 +0800https://blog.youkuaiyun.com/maelee/article/details/122828600https://blog.youkuaiyun.com/maelee/article/details/122828600maeleeMon, 14 Feb 2022 10:45:09 +0800https://blog.youkuaiyun.com/maelee/article/details/122486768https://blog.youkuaiyun.com/maelee/article/details/122486768maeleeFri, 28 Jan 2022 11:46:46 +0800https://blog.youkuaiyun.com/maelee/article/details/122468683https://blog.youkuaiyun.com/maelee/article/details/122468683maeleeThu, 13 Jan 2022 11:53:13 +0800https://blog.youkuaiyun.com/maelee/article/details/122437876https://blog.youkuaiyun.com/maelee/article/details/122437876maeleeWed, 12 Jan 2022 22:39:41 +0800https://blog.youkuaiyun.com/maelee/article/details/122443536https://blog.youkuaiyun.com/maelee/article/details/122443536maeleeTue, 11 Jan 2022 23:20:46 +0800https://blog.youkuaiyun.com/maelee/article/details/122396282https://blog.youkuaiyun.com/maelee/article/details/122396282maeleeTue, 11 Jan 2022 16:48:08 +0800https://blog.youkuaiyun.com/maelee/article/details/122307528https://blog.youkuaiyun.com/maelee/article/details/122307528maeleeSat, 08 Jan 2022 22:15:40 +0800https://blog.youkuaiyun.com/maelee/article/details/122130535https://blog.youkuaiyun.com/maelee/article/details/122130535maeleeTue, 04 Jan 2022 17:11:46 +0800https://blog.youkuaiyun.com/maelee/article/details/121308910https://blog.youkuaiyun.com/maelee/article/details/121308910maeleeSun, 14 Nov 2021 17:18:40 +0800