Reverse lookup of numbers is easier than that of texts.

Reverse Lookup Numbers

For example, how do you look up the appointment date and time for a patient in the below data?

The below video explains the steps

Note:

⭐ It is possible to create an array of Date and Time because Excel stores Date as integers and Time as a fraction of 24 hours

The issue becomes more complex when reverse-looking up text.

Reverse Lookup Text

For example, how do you return the Doctor & Session for a patient below?

See step by step video below

=INDEX(
Doctors&" - "&Sessions,
   MAX(IF(Clients=F5,ROW(Clients)-ROW(Sessions),"")),
      MAX(IF(Clients=F5,COLUMN(Clients)-COLUMN(Doctors),""))
   )

The trick here is using the MAX and IF functions to return both the Row and Column numbers

Also, when returning the row/column number, remember to adjust the count to start after the headers.

Using PowerQuery to Reverse Lookup

Here are the 5 steps

Step 1:
Get data from the Criteria table and load it as a connection only
Then get data from the Appointment table

Step 2:
Select the doctor’s column from the appointment table and unpivot other columns. Then filter it using any patient name.

Step 3:
Convert the criteria table to a single value by drilling down on the value

Step 4:
Replace the temporary filter with the criteria.

Step 5
Modify the filtered appointment table and load it out to an existing worksheet.

Using PowerQuery LeftOuter Join to Reverse Lookup

Here is an alternative using Left-Outer Join.

Step 1:
Get data from the Criteria table and load it as a connection only
Then get data from the Appointment table

Step 2:
Select the doctor’s column from the appointment table and unpivot other columns. Then filter it using any patient name.

Step 3:

Merge the Criteria with the appointment table where the criteria equal to the Patients

Step 4

Expand the merged query, remove the unnecessary columns and load it as a table

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