SQL: How to find exact matches of words within a text - sql

Question

Please bear with me, I'm new to Access and SQL.
What I'm trying to do is to write a SQL query to filter through two tables - one contains words that are split into two columns and the other contains text. Essentially, what I want is a new table that gives me all of the exact matches of the two columns of words with the column of text.
Here's an analogous database to simulate what I want as a result:
Table A:
FirstName: LastName:
John Doe
Jane Doe
Josh Smith
James Jones
David Johnson
Table B:
FullName:
Jake Davidson
Mike Peters
Jason James
John Michael Smith
Query Result:
FirstName: LastName: FullName:
John Doe John Michael Smith
Josh Smith John Michael Smith
James Jones Jason James
(notice that the David - Davidson match didn't come up. i.e. I'd like exact matches only)
So help me fill in the blanks:
SELECT TableA.FirstName,TableA.LastName, TableB.FullName
FROM TableA,TableB
WHERE TableB.FullName LIKE (has an exact match with TableA.FirstName--not sure what to put )
UNION
SELECT TableA.FirstName,TableA.LastName, TableB.FullName
FROM TableA,TableB
WHERE TableB.FullName LIKE (has an exact match with TableA.LastName--not sure what to put)
;

Answer 1

This will be dependant on what you want it to do with FullNames with more than two names, like "John Jacob Smith", but, assuming you want it to ignore the middle word[s],
then try
Select firstname, lastname, fullname
from tableA a
Join tableb f
On f.firstname = Mid(a.fullname, 1, InStr(a.fullname, " ")-1)
Join tableb l
On l.lastname = Mid(a.fullname, InStrRev(a.FullNamee, " ")+1)

Answer 2

Here is an approach that compares each FullName to both Firstname and LastName:
select a.Firstname, a.LastName, b.FullName
from tableA as a inner join
tableB as b
on instr(' '&b.FullName&' ', ' '&a.FirstName&' ') > 0 and
instr(' '&b.FullName&' ', ' '&a.Lastname&' ') > 0
It assume that the delimiter for names is a space (as in your example). The comparison attaches a space onto the beginning and end of FullName and then looks for a space-padded first name and last name.