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astronaut, astronomy
astronaut是个复合词。naut来自希腊语的sailor. astro-: 星的、外太空的。A cosmonaut is an astronaut from the former Soviet Union. The cosmos is the universe. A dozen of handpicked Chinese astronauts, or taikonauts as they are called, are set to explore new horizleetcode 删除一张表中重复邮箱的数据，并且保留最小id 的 那条
/*create view testview as SELECT subject,MIN(Id) as id FROM test GROUP BY subject;select * FROM test WHERE id not in (SELECT id FROM testview);*/ mysql> select * from test;+----+------------+-------+-----------+| id | name | score | subjectmysql 子查询
mysql> select * from test;+----+------------+-------+-----------+| id | name | score | subject |+----+------------+-------+-----------+| 1 | xiaoming | 89 | shuxue || 2 | xiaohong | 89 | shuxue || 3 | xiaohong | 80 |mysql 获取单个科目的平均分
mysql> select * from test;+----+----------+-------+-----------+| id | name | score | subject |+----+----------+-------+-----------+| 1 | xiaoming | 89 | shuxue || 2 | xiaohong | 89 | shuxue || 3 | xiaohong | 80 | english ||