Requently in the process of Magento import you face dilemma: the procedure cannot be completed, because there are no all the necessary fields listed in the file, your data structure placement does not correspond to your import tool requirements or you simply forgot to add some values and made up your mind only in the middle of Magento product update process. What to do? Should you return, do the changes in your file and start all over again? No way, it is not acceptable to waste your time this way.
Performing Magento import via Store Manager for Magento you will forget about having to do any modifications of your data manually. By means of expression rules, that can be applied during import process, you basically, can do almost all the possible adjustments of your file information automatically. 
What exactly is expression?
Expressions are special formulae that allow to add missing information or change present data on the basis of some logical rules that can be applied to indicated in the file values. With expressions the data modifications are made on the fly right in the process of Magento product update, thus the usage of those useful rules will deprive you from having to spend hours on manual product-after-product changes, especially if the amount of products you have in your import file is big.
Where to create/apply expression rule in the process of import?
At the step of Magento import where you are assigning .csv columns to database fields, check the on the left part of the window. There you can see your database columns. Select the column where you need to input changes for Magento product update by means of expression rule. Then press … button and you will see Expression Editor Window, where you can add the necessary formula.
There is also “Auto Complete Window” button, that contains useful prompts that might help you to create correct expression. There you will see the set of available in .csv file fields, the list of commands, functions and macroses for formula creation.
If you need help with functions or more info on how to use them, you can use “SQL help” button.
What info can be changed by means of expressions in the process of Magento import?
Generally, by means of the expressions it is possible to change all the fields available in the list and add certain values to those fields on the fly in the process of Magento product update.
You can add, modify, replace, delete, divide, multiply values of your file or which are already in database. With this purpose all the SQL commands which are in the list can be used. Check our related article on what can be the situations when you need to use expressions and example of most common expressions

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