MySql数据的插入、更新与删除

#插入、更新与删除数据
#插入数据
	1.为表的所有字段插入数据
	格式:insert into 表名 (要插入的列名) values (每列对应插入的数据)
	注意:列名的个数和数据值得数量必须相同,顺序必须对应，要插入列名为空的时候需要为表每一个字段指定值，且值得顺序必须和数据表中字段定义顺序相同;可同时插入多组数据，每组数据用括号包括，两组之间用','分割
	eg.
		mysql> select * from person;
		Empty set (0.00 sec)

		mysql> insert into person(id,name,age,info) values (1,'Green',21,'Lawyer');
		Query OK, 1 row affected (0.03 sec)

		mysql> select * from person;
		+----+-------+-----+--------+
		| id | name  | age | info   |
		+----+-------+-----+--------+
		|  1 | Green |  21 | Lawyer |
		+----+-------+-----+--------+
	2.为表的指定字段插入数据
	格式:insert into person (列名) values (对应列值)
	注意:主键不填时系统会自动为其插入自增的序列值，非主键，会插入该字段定义时默认值
	eg.
		mysql> insert into person (name,age) values('Willam',20);
		Query OK, 1 row affected (0.00 sec)

		mysql> select * from person;
		+----+--------+-----+------------+
		| id | name   | age | info       |
		+----+--------+-----+------------+
		|  1 | Green  |  21 | Lawyer     |
		|  2 | Suse   |  22 | dancer     |
		|  3 | Mary   |  24 | Musician   |
		|  4 | Willam |  20 | sports man |
		|  5 | Willam |  20 | NULL       |
		+----+--------+-----+------------+
	3.将查询结果插入到表中
	格式:insert into 表名1 （列名） select (列名) from 表名2 where 条件
	eg.
		mysql> insert into person (id,name,age,info) select id,name,age,info from person_old;
		Query OK, 2 rows affected (0.00 sec)
		Records: 2  Duplicates: 0  Warnings: 0
		mysql> select * from person;
		+----+---------+-----+------------+
		| id | name    | age | info       |
		+----+---------+-----+------------+
		|  1 | Green   |  21 | Lawyer     |
		|  2 | Suse    |  22 | dancer     |
		|  3 | Mary    |  24 | Musician   |
		|  4 | Willam  |  20 | sports man |
		|  5 | Laura   |  25 | NULL       |
		|  6 | Evans   |  27 | secretary  |
		|  7 | Dale    |  22 | cook       |
		|  8 | Edison  |  28 | singer     |
		|  9 | Harry   |  21 | magician   |
		| 10 | Harriet |  19 | pianist    |
		| 11 | Harry   |  20 | student    |
		| 12 | Beckham |  31 | police     |
		+----+---------+-----+------------+
#数据更新
	格式:update 表名 set 字段名1 = 更新后的值,....,字段名n = 更新后的值 where 条件；
	eg.
	mysql> select * from person where id = 11;
	+----+---------+-----+------------+
	| id | name    | age | info       |
	+----+---------+-----+------------+
	| 11 | Harry   |  20 | student    |
	+----+---------+-----+------------+
	12 rows in set (0.00 sec)

	mysql> update person set age = 15,name = 'LiMing' where id = 11;
	Query OK, 1 row affected (0.00 sec)
	Rows matched: 1  Changed: 1  Warnings: 0

	mysql> select * from person where id = 11;
	+----+---------+-----+------------+
	| id | name    | age | info       |
	+----+---------+-----+------------+
	| 11 | LiMing  |  15 | student    |
	+----+---------+-----+------------+
#删除数据
	格式:delete from 表名 [where <条件>];
	eg.
	mysql> select * from person where id = 11;
	+----+--------+-----+---------+
	| id | name   | age | info    |
	+----+--------+-----+---------+
	| 11 | LiMing |  15 | student |
	+----+--------+-----+---------+
	1 row in set (0.01 sec)

	mysql> delete from person where id = 11;
	Query OK, 1 row affected (0.01 sec)

	mysql> select * from person where id = 11;
	Empty set (0.00 sec)