Matching First and Last Name on two different tables - sql

Question

I am trying to match the first name varchar (50) and last name varchar(50) from table A to the first name varchar(50) and last name varchar(50) on table B. The issue is that both table contain a lot of shortened first names like the name Andrew in table A and there might be a matching record with the last name but the first name is Andy so it comes up as not a match. Is there anyway to get around this in SQL. The shortened names is a vice verse problem meaning that both Table A and Table B have some shortened names.
Here are some more examples:
This is my current code.
Select *
FROM TableA p
JOIN TableB e ON e.CompanyNumber = 1 and e.LastName like '%' + rtrim(ltrim(p.lastname)) + '%'
and e.FirstName like '%' + ltrim(rtrim(p.firstname)) + '%'
NOTE: This is the only way to match the tables together.

Answer 1

Create a third table that associates Long-form and short-form names.
For examle:
Long Form Short Form
Andrew Andy
Andrew Drew
David Dave
William Will
William Bill
William Billy
William Willy

Answer 2

Provided you use a 3rd Table to hold you Long/Short Names as so.
CREATE TABLE TableNames
([Id] int, [OfficialName] varchar(7), [Alias] varchar(7))
;
INSERT INTO TableNames
([Id], [OfficialName], [Alias])
VALUES
(1, 'Andrew', 'Andy'),
(2, 'Andrew', 'Andrew'),
(3, 'William', 'Bill'),
(4, 'William', 'William'),
(5, 'David', 'Dave'),
(6, 'David', 'David')
The following query should give you what you are looking for.
SELECT *
FROM (
SELECT TableA.Id AS T1_Id
,CompanyId AS T1_CompanyId
,FirstName AS T1_FirstName
,LastName AS T1_LastName
,TableNames.OfficialName AS OfficialName
FROM tableA
INNER JOIN tableNames ON TableA.FirstName = TableNames.Alias
) T1
,(
SELECT tableB.Id AS T2_Id
,CompanyId AS T2_CompanyId
,FirstName AS T2_FirstName
,LastName AS T2_LastName
,TableNames.OfficialName AS OfficialName
FROM tableB
INNER JOIN tableNames ON TableB.FirstName = TableNames.Alias
) T2
WHERE T1.T1_CompanyId = T2.T2_CompanyId
AND T1.OfficialName = T2.OfficialName
AND T1.T1_LastName = T2.T2_LastName
I set up my solution sqlfiddle at http://sqlfiddle.com/#!3/64514/2
I hope this helps.

Answer 3

Select *
<br>FROM TableA pJOIN TableB e
<br>ON e.CompanyNumber = 1
<br>and e.LastName like '%' + rtrim(ltrim(p.lastname)) + '%'
<br>OR
<br>e.FirstName like '%' + ltrim(rtrim(p.firstname)) + '%'
Now this depends how you determine it is match,
example:
TableA:
--------
Rownum FristName LastName
1 Andy Smith
2 Andy Mathew
TableB:
--------
Rownum FristName LastName
1 Logan Andy
2 Mathew Andy
Now will you consider first record from both the tables as a match
What about the second record in both the tables?
Basing on this we can even change the query