Combining three SQL queries into one - mysql

Question

I got working code from three queries but I would like to combine them into one or two. Basically I am checking if a provided phone number exists in table contacts or leads as well as if it exists as a secondary number in customfieldsvalues (not all leads have a customfield value though). I am using a CRM system based on CodeIgniter.
What I want to do (non-correct/hypothetical query):
SELECT * FROM contacts OR leads WHERE phonenumber = replace(X, '-', '')
OR leads.id = customvaluefields.relid AND cfields.fieldid = 41 AND cfields.value = X
Tables
table : contacts
+-------+----------------+----------------+
| id | firstname | phonenumber |
+-------+----------------+----------------+
| 1 | John | 214-444-1234 |
| 2 | Mary | 555-111-1234 |
+-------+----------------+----------------+
table : leads
+-------+-----------+---------------------+
| id | name | phonenumber |
+-------+-----------+---------------------+
| 1 | John | 214-444-1234 |
| 2 | Mary | 555-111-1234 |
+-------+-----------+---------------------+
table : customvaluefields
+-------+-----------+-------------+-----------+
| id | relid | fieldid | value |
+-------+-----------+-------------+-----------+
| 1 | 1 | 41 | 222333444 |
| 2 | 1 | 20 | Management|
| 3 | 2 | 41 | 333444555 |
+-------+-----------+-------------+-----------+

Answer 1

If I understand what you are trying to, maybe UNION ALL would work. This is something to get you started:
SELECT C.ID, C.FirstName, C.Phonenumber
FROM Contacts C
JOIN CustomValueField CVF
ON c.ID = CVF.RelID AND
CVF.ID = 41
AND REPLACE(Phonenumber,'-','') = cvf.Value
UNION ALL
SELECT L.ID, L.FirstName, L.Phonenumber
FROM Leads L
JOIN CustomValueField CVF
ON L.ID = CVF.RelID AND
CVF.ID = 41
AND REPLACE(Phonenumber,'-','') = cvf.Value
I'm joining the contacts and leads tables to CustomeValueField in each query and then UNION them together along with the WHERE clause in each. I'm sure it's not 100% correct for what you need, but should get you headed to a solution. Here is more information: https://dev.mysql.com/doc/refman/8.0/en/union.html