Sometimes, we need to check when was the data last accessed. In MySQL, we had taken a field last_modified_time as timestamp datatype in a table, which was set to CURRENT_TIMESTAMP by DEFAULT.
When a new record was inserted, it automatically updated the field and set the current datetime into this field. But if we updated any other field, its value remain older.
Solution : In order to update that field, we need to explicitly specify that we want to update it on updation in the record.
last_modified_time timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
ON UPDATE CURRENT_TIMESTAMP is the key.
Now when we update any field of a record, it will update last_modified_time column to current timestamp in same record.
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