Postgres 13

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select current_timestamp

current_timestamp

2024-01-27 23:34:46.597847+00

SELECT 1

select current_timestamp()

ERROR:  syntax error at or near ")"
LINE 1: select current_timestamp()
                                 ^

select current_timestamp(2)

current_timestamp

2024-01-27 23:34:46.6+00

SELECT 1