I want to set date as default value for date in mysql (not timestamp), but the following error appear
ALTER TABLE `RMS`.`transactionentry`
CHANGE `Date` `Date` DATE DEFAULT NOW() NOT NULL
Error
Invalid default value for 'Date'
Same Case
alter table `RMS`.`transactionentry`
change `Date` `Date` date default 'CURRENT_DATE' NOT NULL
alter table `RMS`.`transactionentry`
change `Date` `Date` date default current_timestamp NOT NULL
I don't think you can achieve that with mysql date
. You have to use timestamp
or try this approach..
CREATE TRIGGER transactionentry_OnInsert BEFORE INSERT ON `RMS`.`transactionentry`
FOR EACH ROW SET NEW.dateColumn = IFNULL(NEW.dateColumn, NOW());
The DEFAULT value clause in a data type specification indicates a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a function such as NOW() or CURRENT_DATE. The exception is that you can specify CURRENT_TIMESTAMP as the default for a TIMESTAMP column.
According to the MySQL site:
The DEFAULT value clause in a data type specification indicates a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a function such as NOW() or CURRENT_DATE. The exception is that you can specify CURRENT_TIMESTAMP as the default for a TIMESTAMP column.
So:
alter table `RMS`.`transactionentry`
change `Date` `Date` date default CURRENT_TIMESTAMP NOT NULL
should work. Your issue was you're making it a string by placing quotes around it.
记住它可能是MYSQL版本本身的问题5.6允许时间戳没有默认值,并且不需要将它们设置为null但是5.7要求你明确设置默认值,如果不是那么nul
You can change the column definition with:
ALTER TABLE transactionentry MODIFY COLUMN `Date` date null;
Allow null works for me.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.