设置默认日期的MySQL语法 [英] MySQL Syntax for setting Default Date

问题描述

如何在mysql中将元素设置为某个默认日期？

How can we set element to some default date in mysql ?

• 在oracle中，我们会做一些类似

• In oracle we would do something like

start_date DATE DEFAULT to_date（'01011900'，'DDMMYYYY'）

start_date DATE DEFAULT to__date('01011900','DDMMYYYY')

mutation_date_time DATE DEFAULT SYSDATE

mutation_date_time DATE DEFAULT SYSDATE

CONSTRAINT entity_specification UNIQUE（external_name， start_date_time，end_date_time））

CONSTRAINT entity_specification UNIQUE(external_name, start_date_time, end_date_time))

还有我们有任何网站或资源，我们可以获得MySQL等效的语法到Oracle语法。

Also do we have any site or resource where we can get MySQL equivalent syntax to Oracle Syntax.

更新

我试图按照回答中提到的做法，错误信息：

I tried to do as mentioned in answer but again am getting error message:

    create table product_offer_type(object_id INT(19), snapshot_id INT(19), PRIMARY KEY(object_id,snapshot_id), enum_value VARCHAR(64) NOT NULL, external_name VARCHAR(64) NOT NULL, description VARCHAR(255), business_validation INT(1), valid_for_start_date_time DATE DEFAULT '1900-01-10', valid_for_end_date_timeDATE DEFAULT '4712-01-01', mutation_date_time DATE DEFAULT 'SYSDATE()', mutation_user VARCHAR(32) DEFAULT 'USER');
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DEFAULT '4712-01-01', mutation_date_time DATE DEFAULT 'SYSDATE()', mutation_user' at line 1
mysql>

推荐答案

只需传递格式化的字符串。

Simply pass it a formatted string.

start_date DATE DEFAULT '1900-01-01'

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