SQL Help - Insert into a table, data from two different tables, based on a reference table - sql

Question

I have a four tables I am working with. One of the tables is empyt (ATM) with three columns (ID, Cust_AcctID, Brch_CtyID) and I would like to insert data into the Cust_AcctID and Brch_CtyID columns of this table.
ID | Cust_AcctID | Brch_CtyID
The second table (Cust_Acct) also has three columns (ID, Customer and Account)
The Customer and Account columns hold string data. The ID value in this column is what I am looking to have inserted into the ATM table in the Cust_AcctID column
ID | Customer | Account
1 | John Doe | Checking
2 | John Doe | Saving
3 | Jane Doe | Checking
4 | Jane Doe | Plan24
The Third table (Brch_Cty) has three columns as well (ID, Branch and City)
The Branch and City columns hold string data. The ID value in this column is what I am looking to have inserted into the ATM table in the Brch_CtyID column.
ID | Branch | City
1 | Main Branch | New York
2 | Second Branch | New York
3 | Main Branch | Chicago
4 | Uptown Branch | Detroit
The fourth table is a reference table that holds all the valid combinations Of (Customers, Account) and (Branch, City). All data in these columns are strings.
Customer | Account | Branch | City
John Doe | Checking | Main Branch | New York
John Doe | Savings | Second Branch | New York
John Doe | Checking | Uptown Branch | Detroit
Jane Doe | Checking | Uptown Branch | Detroit
Using the data from table 4, I would like to insert into the ATM table the the data from the ID column from the Cust_Acct Table into the Cust_AcctID column where it matches the data in the fourth table. The same goes for the Brch_Cty table ID to be inserted into the Brch_CtyID column
So the ATM table should look like this
ID | Cust_AcctID | Brch_CtyID
1|1|1
2|2|2
3|1|4
4|3|4
Could you please help me with building a SQL statement for this. I am really stuck figuring this one out. Thanks for any help given.

Answer 1

Can you try the following :
Select ca.ID,bc.ID
From dbo.temp t Inner join dbo.Cust_Acct ca on ca.Customer=t.Customer AND
ca.Account=t.Account
inner join dbo.Brch_City bc on bc.Branch=t.Branch AND bc.City=t.City
Where ca.Customer=t.Customer AND ca.Account=t.Account AND bc.Branch=t.Branch
AND bc.City=t.City
Hope this helps. :)