在MySQL中创建表格以将当前日期设置为默认日期
以下是创建表和添加DEFAULT约束以设置默认值的语法-
CREATE TABLE yourTableName(
yourColumnName1 dataType not null ,
yourColumnName2 dataType default anyValue,
.
.
.
N
);;
让我们创建一个表,其中我们将“ employee_joining_date”设置为当前日期的默认约束为默认值-
mysql> create table demo43−> (
−> employee_id int not null auto_increment primary key,
−> employee_name varchar(40) not null,
−> employee_status varchar(60) default "NOT JOINED",
−> employee_joining_date date default(CURRENT_DATE)
−> );
借助insert命令将一些记录插入表中-
mysql> insert into demo43(employee_name,employee_status,employee_joining_date) values('John','JOINED','2020-05-10');mysql> insert into demo43(employee_name,employee_status,employee_joining_date) values('David','JOINED','2020-10-12');
mysql> insert into demo43(employee_name) values('Bob');
使用select语句显示表中的记录-
mysql> select *from demo43;
这将产生以下输出-
+-------------+---------------+-----------------+-----------------------+| employee_id | employee_name | employee_status | employee_joining_date |
+-------------+---------------+-----------------+-----------------------+
| 1 | John | JOINED | 2020−05−10 |
| 2 | David | JOINED | 2020−10−12 |
| 3 | Bob | NOT JOINED | 2020−10−31 |
+-------------+---------------+-----------------+-----------------------+
3 rows in set (0.00 sec)
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