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Is it possible to auto update timestamp in MySQL?
It is not possible to have the current timestamp be the default value for one column and the auto-update value for another column. Previously, at most one TIMESTAMP column per table could be automatically initialized or updated to the current date and time. This restriction has been lifted.
How to get the time of last update in MySQL?
In other words, there is no native mechanism to put any timestamps on column changes. Any time that the UPDATE_TIME column in INFORMATION_SCHEMA.TABLES is updated. This may be a bitter pill to swallow, but you must do the following: This may not be so bad if you are customizing for a few tables and a few columns.
Can a table have both created and Last updated timestamp?
ERROR 1293 (HY000): Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause. My question is, can I have both of those fields? or do I have to manually set a LastUpdated field during each transaction?
How to create both timestamp columns in MySQL?
Create both timestamp columns like so: Note that it is necessary to enter null into both columns during insert:
Can a table have the current timestamp as the default value?
One TIMESTAMP column in a table can have the current timestamp as the default value for initializing the column, as the auto-update value, or both. It is not possible to have the current timestamp be the default value for one column and the auto-update value for another column.
Is there a first and last function in MySQL?
Note that MySQL does not have FIRST () and LAST () aggregate functions for GROUP BY but such FIRST () AND LAST () can be simulated by using GROUP_CONCAT () and SUBSTRING_INDEX () functions. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.
How to select the first value in MySQL?
Starting with MySQL 8, you would ideally use window functions for the task: You will likely need to COALESCE function to get the first value. However, you need to make sure that days without data (weekends and holidays) have a null value for _open on those days without data.