SQL无效的ALTER TABLE选项

Question

With the following SQL statement:

ALTER TABLE USERS
    ADD LAST_LOGIN DATETIME() 

I am receiving the error below:

Error report -
SQL Error: ORA-01735: invalid ALTER TABLE option
01735. 00000 -  "invalid ALTER TABLE option"
*Cause:    
*Action:

I cannot for the life of me understand why SQLDeveloper does not like the fromatting of my rather simple alter table command.

Answer 1

DATETIME is not a valid column data type. If you're trying to add a default value, you need to specify a DEFAULT .

If you are trying to use a date format, please use one of the datetime or interval data types . If you need to store date and time, the standard DATE format stores year, month, day, hour, minutes, and seconds.