Merge Tables based on first non-blank condition

[JoshB_]

Hi there,

I have two tables, each table contains employees and contains an ID, a personal Email, and a work email

Unfortunately, they don't match very well, and there will be no way of cleaning the data.

What I want is to merge the cols from table 1 and table 2, then the challenge I'm facing is matching them. From the samples below, I want to pull the colums A, B C....etc into table 2 where a match can be found on either, ID, Personal Email or Work Email. In the example, ID 2 matches and pulls the result, whereas Steven entered his ID wrong in table 1, so it doesn't find him, but can find a match by email.

My plan is to create a column in table 1, then using lookup checks the 3 conditions, then using coalesce, returns the first non-blank and finds the correct ID from table 2, I can then join the tables.

Heres my attempt:

Matching_ID =

VAR Lookupid = LOOKUPVALUE(Table2[ID], Table2[ID], Table1[ID])

VAR LookupPersonalEmail = LOOKUPVALUE(Table2[ID], Table2[Personal Email], Table1[Personal Email])

VAR LookupWorkEmail = LOOKUPVALUE(Table2[ID], Table2[Work Email], Table1[Work Email])

Return

COALESCE(Lookupid, LookupPersonalEmail, LookupWorkEmail)

and I get the error: A table of multiple values was supplied where a single value was expected.

I've tried doing a filter, or using FirstNonBlankValue, but every which way, I get some error. 

Any help with this function, or approach would be appriciated

 Table 1:

ID	Personal Email	Work Email	Col A
2	Josh@email	Josh1@email	A
3	Amy@email	Amy1@email	B
7	james@email	james1@email	B

Table 2:

ID	Personal Email	Work Email	Col A from Table 1
2	Josh@email	JoshB@email	A
4	james@email	james1@email	B
3	Amy@email	Amy22@email	B

[Fowmy · Accepted solution]

@JoshB_ 

I did it in a different way, please check:

Col A = 
VAR _ID = [ID]
VAR _PMAIL = [Personal Email]
VAR _WMAIL = [Work Email]
RETURN
MAXX(
    FILTER(
        'Table-1',
        'Table-1'[ID] = _ID || 'Table-1'[Personal Email] = _PMAIL || 'Table-1'[Work Email] = _WMAIL
    ),
    'Table-1'[Col A]
)

[JoshB_]

Perfect, thank you.