MYSQL update query to remove spaces

Question

One of my clients has added a number of account numbers in one of our applications. While trying to make a transaction the transaction fails due to the spaces at the end of the account number. How do i update his records in the Mysql database to remove all the spaces from accounts that have them at the end, without making him delete the clients and re-adding the accounts? the structure of the table(s) is as follows:

Not sure how to structure the query or the function of the mysql

The account table:

the account table:
CUSTOMER_ID              
ACCOUNTNUMBER        
TXT                   
CURRENCY_NO            
USER_ID                  
ACTIVE_FLAG               
USER_DATE                 
ben_bic_address          
int_bic_address 

the admin table

  ADM_USER_ID           
  LOCATION_CD          
  LANG                
  USER_NAME              
  USER_LOGIN            
  USER_PASSWORD          
 GROUP_CODE            
 USER_ID              
  USER_DATE               
  ACTIVE                 
 COUNTER                
 connected              
 IP

And the customer table:

CUSTOMER_ID               
COUNTRY_NO              
USER_ID                   
CUSTOMER_NAME 
ACTIVE_FLAG

Answer 1

If you need to RTRIM() all the accounts of a particular customer, you can use a JOIN with your UPDATE statement as follows:

UPDATE
    accounts_table
INNER JOIN
    customers_table ON (accounts_table.user_id = customers_table.user_id)
SET 
    accountnumber = RTRIM(accountnumber)
WHERE
    customers_table.customer_id = 'customer id';

If you do not have many records in accounts_table, and you want to make sure that all the accountnumber values are trimmed, you can simply apply the trim to all the records as follows:

UPDATE
    accounts_table
SET 
    accountnumber = TRIM(accountnumber);