This query replace companyname with firstname and lastname of customer, when companyname is not yet defined:

UPDATE `tblclients` SET `companyname` = CONCAT(firstname, ' ', lastname) WHERE `companyname` = ''


This query calculates the current credit of the customer with id=123, making the sum of every single credit transaction 

SELECT sum(amount) FROM `tblcredit` WHERE clientid=123


This query replace companyname with firstname and lastname of customer, when companyname is defined as "n/a":

UPDATE `tblclients` SET `companyname` = CONCAT(firstname, ' ', lastname) WHERE `companyname` = 'n/a'

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