[SQL] How to use PERCENTILE_CONT without over clause? any alternative to it?

I am interested in finding median of an entire column in SQL Server and I don't want to partition/subset column based on some other attribute. I am looking for a way to use PERCENTILE_CONT without over or any other function to find median. I have tried

over(my_table)
OVER (PARTITION BY NULL)
OVER ( NULL)

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