PowerQuery. Building a FK based on condition in Foreign Table

Hi GiuPowerBi ,

Based on the information you have provided, you can follow the steps below:

1.Add new column.

Key =
IF (
    'Table'[Type] = "Employee"
        && 'Table'[Date] >= MAX ( 'Table2'[Lower Date] )
        && 'Table'[Date] <= MAX ( 'Table2'[Upper Date] ),
    1,
    IF (
        'Table'[Type] = "Freelance"
            && 'Table'[Date] >= MAX ( 'Table2'[Lower Date] )
            && 'Table'[Date] <= MAX ( 'Table2'[Upper Date] ),
        2,
        IF (
            'Table'[Type] = "Employee"
                && 'Table'[Date] >= MIN ( 'Table2'[Lower Date] )
                && 'Table'[Date] <= MIN ( 'Table2'[Upper Date] ),
            3,
            4
        )
    )
)

 Final output:

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Best Regards,

Ada Wang

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pls try code in Power Query