Display problems

I am trying to do a query that displays the customer name with the "customer" label. Here's what I've done so far:

SELECT a.account_id, a.cust_id, a.last_activity_date, a.open_emp_id,
CONCAT(e.fname, ' ', e.lname) as Opened_by, a.avail_balance
FROM account a INNER JOIN employee e
ON a.open_emp_id = e. emp_id
CONCAT (i.fname, i.lname, b.name) AS Customer
FROM individual i INNER JOIN business b
on b.cust_id = i.cust_id
WHERE NOT EXISTS (SELECT 1
FROM transaction t
WHERE t.txn_date = a.last_activity_date);

I got this error message:

Error Code: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CONCAT (i.fname, i.lname, b.name) AS Customer
FROM individual i INNER JOIN busin' at line 5

It had been working great until I added the 2nd CONCAT & INNER JOIN.

Thanks in advance for helping someone who's still learning.

Wrong forum. This one is for Postgres

Sorry. I guess I clicked on it my mistake.