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-4326 A NULL value may not be applied to substrings.

The value NULL is a whole value that is relevant to complete variables only. You can assign NULL to the name of this variable (omitting the substring notation) to make the entire variable contain the null string. Alternatively, you can assign spaces to a substring to make it blank. The only way to delete a portion of a string is to write an expression that extracts the leading and trailing substrings that are to be retained and concatenates them.