Managing String Case
AMPS provides the UPPER and LOWER functions to produce a string in a specific case. This can be useful when constructing fields, or when an expression needs case-insensitive comparisons against a group of values using the IN clause.
As described above in String Comparison Functions, AMPS provides INSTR_I and STREQUAL_I functions for performing case-insensitive comparisons. In some cases, particularly when using strings with the IN clause, it is more efficient to simply convert the string to a known case.
The UPPER and LOWER functions are not unicode-aware; these functions will not produce the correct data when used with multibyte characters. For example, you might compare an incoming field of unknown case to a set of known values as follows:
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