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问题描述



表SQL是:

$ b我有一个很大的生日表,我想从一个varchar列转换为一个日期列。
$ b

  CREATE TABLE`birthdaydays`(
`id` bigint(20)NOT NULL AUTO_INCREMENT,
`uid` bigint(20) DEFAULT NULL,
`birthday_date` varchar(255)DEFAULT NULL,
PRIMARY KEY(`id`)
)ENGINE = MyISAM

生日日期以两种方式之一存储:字符串,如05/26/1994或有时是03/14(适用于不想要的人)



创建另一个表格并将日历存储在日期列中的最佳方式是什么?是否可能这样做只是使用MySQL(并避免使用PHP或其他中介)?



我在MySQL中找到了一个STR_TO_DATE函数。我应该使用这个吗?



谢谢!

解决方案
  SELECT IF(birthday_date RLIKE'[0-9] {2} / [0-9] {2} / [0-9] {4}',STR_TO_DATE(birthday_date,'%m /%d /%Y'),STR_TO_DATE(birthday_date,'%m /%d')); 

这将导致没有年份的行的日期如0000-03-14。您的服务器需要配置为允许无效日期(请参阅)


I have a large table of birthdays that I want to convert from a varchar column to a date column.

The table SQL is:

CREATE TABLE `birthdays` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `uid` bigint(20) DEFAULT NULL,
  `birthday_date` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM

The birthday date is stored in one of two ways: strings like "05/26/1994" or sometimes "03/14" (for people who don't want to reveal their birth year).

What is the best way to create another table and store the birthdays in a date column? Is it possible to do this just using MySQL (and avoid using PHP or some other intermediary)?

I have found a STR_TO_DATE function in MySQL. Should I use this?

Thanks!

解决方案
SELECT IF(birthday_date RLIKE '[0-9]{2}/[0-9]{2}/[0-9]{4}',STR_TO_DATE(birthday_date,'%m/%d/%Y'),STR_TO_DATE(birthday_date,'%m/%d'));

This will result in dates like 0000-03-14 for rows that have no year entered. Your server needs to be configured to allow invalid dates though (see http://dev.mysql.com/doc/refman/5.0/en/server-sql-mode.html )

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07-31 19:06