MySQL - How to set a default value as TIMESTAMP on varchar column

 In MySQL, you cannot directly set a default value of a VARCHAR column as a TIMESTAMP because they are of different data types. However, you can achieve a similar effect by using a trigger to automatically set the VARCHAR column to the current timestamp when a new row is inserted. Here's an example of how you can do this:


1. Create your table with a VARCHAR column to hold the timestamp:


```sql

CREATE TABLE your_table (

    id INT AUTO_INCREMENT PRIMARY KEY,

    your_column VARCHAR(20),

    -- Other columns

);

```


2. Create a trigger that sets the VARCHAR column to the current timestamp when a new row is inserted:


```sql

DELIMITER //

CREATE TRIGGER set_timestamp

BEFORE INSERT ON your_table

FOR EACH ROW

BEGIN

    SET NEW.your_column = NOW();

END;

//

DELIMITER ;

```


This trigger will automatically set the value of `your_column` to the current timestamp whenever a new row is inserted into the table.


Please replace `your_table` and `your_column` with your actual table and column names.

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