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约束2084 · 对课程表添加主键约束ALTER TABLE `courses` ADD PRIMARY KEY (`id`); 2085 · 删除课程表...
算数函数(一)2034 · 查询指定邮箱结尾的教师平均年龄select AVG(`age`) AS average_teacher_age from te...
比较运算符1952 · 查询超过 20 岁的教师select * from teachers where `age` > '20'; 1953 · ...
Hello SQL2045 · 输出 Hello LintCodeSELECT "Hello LintCode!" 简单的 SELEC...