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mysql> select * from college_view; +-------------+--------------+-------------+------------+ | student_num | student_name | student_age | department | +-------------+--------------+-------------+------------+ | 901 | 張三 | 20 | 外語 | +-------------+--------------+-------------+------------+ 1 row in set (0.00 sec)mysql> show create table college; +---------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +---------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | college | CREATE TABLE `college` (`number` int NOT NULL,`name` varchar(20) NOT NULL,`major` varchar(20) DEFAULT NULL,`age` int DEFAULT NULL,PRIMARY KEY (`number`),UNIQUE KEY `number` (`number`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci | +---------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)

?插入一條記錄，然后查詢記錄，可以發(fā)現(xiàn)

mysql> insert into college_view-> values (0901,'張三',20,'外語'); Query OK, 1 row affected (0.00 sec) mysql> select * from college; +--------+--------+--------+------+ | number | name | major | age | +--------+--------+--------+------+ | 901 | 張三 | 外語 | 20 | +--------+--------+--------+------+ 1 row in set (0.00 sec)

書本上的number字段都是四位數(shù)字，高位是０，想達(dá)到這樣的效果，必須高位用0填補(bǔ)，使用zerofill參數(shù)，

所以更改表college的number字段 ,代碼如下：

mysql> alter table college -> modify number int(4) zerofill; Query OK, 1 row affected, 2 warnings (0.06 sec) Records: 1 Duplicates: 0 Warnings: 2

接下來繼續(xù)查詢表和視圖，發(fā)現(xiàn)number字段高位全部變成０填充了：

mysql> select * from college; +--------+--------+--------+------+ | number | name | major | age | +--------+--------+--------+------+ | 0901 | 張三 | 外語 | 20 | +--------+--------+--------+------+ 1 row in set (0.00 sec)mysql> select * from college_view; +-------------+--------------+-------------+------------+ | student_num | student_name | student_age | department | +-------------+--------------+-------------+------------+ | 0901 | 張三 | 20 | 外語 | +-------------+--------------+-------------+------------+ 1 row in set (0.00 sec)

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