DML

新增資料

程式碼實現

mysql>  select * from stu;
+------+------+------+
| name | id   | sex  |
+------+------+------+
| xue  | 1    | 1    |
| he   | 2    | 2    |
+------+------+------+
2 rows in set (0.01 sec)

mysql> insert into stu(name,id,sex) values("小爽",1,"女");
Query OK, 1 row affected (0.01 sec)

mysql> select * from stu;
+------+------+------+
| name | id   | sex  |
+------+------+------+
| xue  | 1    | 1    |
| he   | 2    | 2    |
| 小爽 | 1    | 女   |
+------+------+------+
3 rows in set (0.01 sec)
 

修改資料

程式碼實現

mysql> select * from stu;
+------+------+------+
| name | id   | sex  |
+------+------+------+
| xue  | 1    | 男   |
| he   | 2    | 2    |
| 小爽 | 1    | 女   |
| 小程 | 2    | 男   |
+------+------+------+
4 rows in set (0.02 sec)

mysql> update stu set sex = "男" where name = "he";
Query OK, 1 row affected (0.03 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from stu;
+------+------+------+
| name | id   | sex  |
+------+------+------+
| xue  | 1    | 男   |
| he   | 2    | 男   |
| 小爽 | 1    | 女   |
| 小程 | 2    | 男   |
+------+------+------+
4 rows in set (0.00 sec)
 

刪除資料

程式碼實現

mysql> select * from stu;
+------+------+------+
| name | id   | sex  |
+------+------+------+
| xue  | 1    | 男   |
| he   | 2    | 男   |
| 小爽 | 1    | 女   |
| 小程 | 2    | 男   |
+------+------+------+
4 rows in set (0.00 sec)

mysql> delete from stu where name = "he";
Query OK, 1 row affected (0.01 sec)

mysql>  select * from stu;
+------+------+------+
| name | id   | sex  |
+------+------+------+
| xue  | 1    | 男   |
| 小爽 | 1    | 女   |
| 小程 | 2    | 男   |
+------+------+------+
3 rows in set (0.00 sec)
 

DQL

程式碼實現

mysql> select name , sex from stu;
+------+------+
| name | sex  |
+------+------+
| xue  | 男   |
| 小爽 | 女   |
| 小程 | 男   |
+------+------+
3 rows in set (0.00 sec)

程式碼實現

mysql> select distinct sex from stu;
+------+
| sex  |
+------+
| 男   |
| 女   |
+------+
2 rows in set (0.03 sec)

起別名
程式碼實現

mysql> select name as "姓名",sex "性別" from stu;
+------+------+
| 姓名 | 性別 |
+------+------+
| xue  | 男   |
| 小爽 | 女   |
| 小程 | 男   |
+------+------+
3 rows in set (0.00 sec)