Why does CURRENT_TIMESTAMP return the same value for each row?

This is as designed. CURRENT_TIMESTAMP gives the same consistent value for the entire stack of statements. This means that CURRENT_TIMESTAMP will have the same value in the same statement, and also during the execution of a stored procedure and various stored procedures it might call in turn.

If you wish to get the 'current' time instead of 'statement' time, use 'now' which is a special value:

select cast('now' as timestamp)
from ...

Since 'now' is a string, it is evaluated (coverted to timestamp) at each execution.

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