how to set default current timestamp in mysql code example

Example 1: mysql default timestamp value to be current timestamp

CURRENT_TIMESTAMP

You can use two timestamp in one table. For default, use DEFAULT field first 
and then the rest timestamp fields.

Below query should work.

CREATE TABLE myTable 
(
 id INT,
 date_registered TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, 
 date_validated TIMESTAMP
);

Example 2: mysql create timestamp column

ALTER TABLE `table1` ADD `lastUpdated` TIMESTAMP ON UPDATE CURRENT_TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ;

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Sql Example

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