How to use a UNIQUE formula with an IFS formula in Google Sheets

For example if a Uniqueifs existed, I'd have =uniqueifs('Data'!H2:H10000, 'Data'!F2:F10000, A18)

1. If a cell in the range of 'Data'!F2:F10000' contains the contents of the cell A18, then..

2. Print out the unique results of cells in the range of 'Data'!H2:H10000 in the corresponding row.

Sorta how a sumif formula works for numbers, but don't add them if this explains.

I'd consider my self fairly new to Google Sheets so don't make fun of me.