21 lines
471 B
Markdown
21 lines
471 B
Markdown
```sql
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#1.修改字段数据类型
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ALTER TABLE t_student MODIFY sex ENUM('男', '女');
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#2.添加字段
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ALTER TABLE t_student ADD tel CHAR(20);
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#3.修改数据类型
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ALTER TABLE t_coach MODIFY salary INT(6) ZEROFILL;
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#4.插入记录
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INSERT INTO t_coach()
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VALUES(DEFAULT, '赵欣彤', '女', 25, 6000);
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#5.更新记录
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UPDATE t_class c
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SET c.period = 18
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WHERE c.id = 10005;
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#6.条件、连接查询 tj11
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#7.分组、连接查询 tj12
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#8.条件、连接查询 视图
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``` |