Select rows from table A where string exists in a similar column in table B or table C

Question

I have 3 different SQL tables that I am working with. Here is what the table look like:

Master Accounts
---------------
CustomerNumber PK
CompanyName
More Columns...

Bill Tos
---------------
MasterCustomerNumber FK
CompanyName

Ship Tos
---------------
MasterCustomerNumber FK
CompanyName

I want to write a MS SQL query that returns all the columns in the Master Accounts table where a company name contains the string 'ama' in any of the three tables.

Here is my current SQL:

SELECT DISTINCT
  MA.*
FROM MasterAccounts MA
LEFT JOIN BillTos BT
  ON MA.CustNo = BT.MasterCustNo
LEFT JOIN ShipTos ST
  ON MA.CustNo = ST.MasterCustNo
WHERE MA.CompanyName LIKE '%ama%' OR BT.CompanyName LIKE '%ama%' OR ST.CompanyName LIKE '%ama%'

My goal is to get all master accounts where a billto or a shipto companyname contains 'ama'.

Answer 1

I read yours comments and maybe this go faster:

select MA.* from
MasterAccounts MA
join 
(select CustNo  nmb from MasterAccounts where CompanyName LIKE '%ama%'
union 
select MasterCustNo nmb from BillTos  where CompanyName LIKE '%ama%'
union 
select MasterCustNo nmb from ShipTos where CompanyName LIKE '%ama%' ) num on (num.nmb = MA.CustNo) 

if you need more companies maybe you use company name in lower case...

*if is small error in query i'm sorry - i read this fast....