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All values specified after a CHANGE TO statement, until the end of the JCL stream or until the next SELECT statement, replace the existing values in the selected records. The ? wild-character can be used when specifying "change to" values.
For example
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means that the first character in the USER field is replaced with ‘a’ and the remaining 7 characters are not changed
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means that the first character in the USER field is replaced with ‘a’, the third character is replaced with ‘b’, and the other 6 characters are not changed.
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