表记录之增删改操作

版权声明：17602128911 https://blog.csdn.net/bus_lupe/article/details/88295798

增加一条记录

mysql> insert into emp (id, age, name, gender, salary, depart, is_married)
    -> values (1, 22, "lupe", 0, 20000, "技术管理部", 0);
Query OK, 1 row affected (0.00 sec)

mysql> select * from emp;
+----+-----+------+--------+----------+------------+------------+
| id | age | name | gender | salary   | depart     | is_married |
+----+-----+------+--------+----------+------------+------------+
|  1 |  22 | lupe |      0 | 20000.00 | 技术管理部 |          0 |
+----+-----+------+--------+----------+------------+------------+
1 row in set (0.00 sec)

mysql> INSERT INTO emp(name, salary, depart) values ("瞎驴", 30000, "python");
Query OK, 1 row affected (0.00 sec)

mysql> select * from emp;
+----+-----+------+--------+----------+------------+------------+
| id | age | name | gender | salary   | depart     | is_married |
+----+-----+------+--------+----------+------------+------------+
|  1 |  22 | lupe |      0 | 20000.00 | 技术管理部 |          0 |
|  2 |  18 | 瞎驴 |   NULL | 30000.00 | python     |       NULL |
+----+-----+------+--------+----------+------------+------------+
2 rows in set (0.00 sec)

加多条记录

INSERT INTO emp(name, salary, depart) values ("瞎驴", 30000, "python"),
("青神", 8000, "ui"),
("Mr.Clean", 50000, "技术研发部");

如果省略了name，需要所有定义的字段都有值

INSERT INTO emp values (20, 22, "小雨", 1, 9000, "人力资源", 1);

set插入

INSERT INTO emp set name = "珊珊";

修改表记录

UPDATE emp set salary = salary + 20000 where name = "lupe";

删除表记录

mysql> DELETE FROM emp where name = "瞎驴" OR id = 20;
Query OK, 7 rows affected (0.00 sec)

mysql> select * from emp;
+----+-----+----------+--------+----------+------------+------------+
| id | age | name     | gender | salary   | depart     | is_married |
+----+-----+----------+--------+----------+------------+------------+
|  1 |  22 | lupe     |      0 | 40000.00 | 技术管理部 |          0 |
|  5 |  18 | 青神     |   NULL |  8000.00 | ui         |       NULL |
|  7 |  18 | 青神     |   NULL |  8000.00 | ui         |       NULL |
|  9 |  18 | 青神     |   NULL |  8000.00 | ui         |       NULL |
| 11 |  18 | 青神     |   NULL |  8000.00 | ui         |       NULL |
| 12 |  18 | Mr.Clean |   NULL | 50000.00 | 技术研发部 |       NULL |
| 21 |  18 | 珊珊     |   NULL |     NULL | NULL       |       NULL |
+----+-----+----------+--------+----------+------------+------------+
7 rows in set (0.00 sec)

删除表

mysql> truncate table emp;
Query OK, 0 rows affected (0.02 sec)

DELETE FROM emp;