Lexical Functions
LLT = lexically less than
LLE = lexically less than or equal to
LGT = lexically greater than
LGE = lexically greater than or equal to
These functions always compare characters according to the ASCII collating sequence.
Do not use the relational operators <, <=, > and >= with character strings.
example
rst = LLT(string1, string2)
* lexical = 사전의
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