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How to Get New Pinterest API Keys

If you want to create amazing applications with Pinterest’s features, you’ll need to know how to get the latest Pinterest API keys. If you’re a developer or want to create amazing applications with Pinterest’s features, you’ll need to know how to get the latest PinterestTo obtain Pinterest API keys, you must first create a developer […] ....

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MySql知识体系总结(SQL优化篇)_GooReey的博客-CSDN博客


1、建表语句
CREATE TABLE `student` (
`id` int(10) NOT NULL,
`name` varchar(20) NOT NULL,
`age` int(10) NOT NULL,
`sex` int(11) DEFAULT NULL,
`address` varchar(100) DEFAULT NULL,
`phone` varchar(100) DEFAULT NULL,
`create time` timestamp NULL DEFAULT NULL,
`update time` timestamp NULL DEFAULT NULL,
`deleted` int(11) DEFAULT NULL,
`teacher id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `teacher` (
`id` int(11) DEFAULT NULL,
`name` varchar(100) DEFAULT NULL,
`course` varchar(100) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
2、左连接查询 
explain select s.name,t.name from student s left join teacher t on s.teacher id = t.id where t.course = 数学 ....

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