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doc: mysql.md modify column (#98)

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@ -173,6 +173,12 @@ ALTER TABLE t1 RENAME TO t2;
ALTER TABLE t1 RENAME c1 TO c2 ;
```
将列c1的数据类型改为datatype
```sql
ALTER TABLE t1 MODIFY c1 datatype;
```
删除表中的所有数据
```sql