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LAST USER is the user ID of the user who last modified the row.
LAST USER can be used as a default value in columns with character data types.
On INSERT, this constant has the same effect as CURRENT USER.
On UPDATE, if a column with a default value of LAST USER is not explicitly modified, it is changed to the name of the current
When combined with the DEFAULT TIMESTAMP, a default value of LAST USER can be used to record (in separate columns) both the
user and the date and time of day a row was last changed.