String_Operators

 A  string  operator  concatenates,   compares   character-string
 expressions,  or  tests string inclusion in another string.  The
 result is either a string or a Boolean value.

 String Operators:

   operator | example |    result
   --------------------------------------------
      +       A +  B   String that is the concatenation of strings

      =       A =  B   TRUE if strings A and B have equal ASCII values

      <>      A <> B   TRUE if strings A and B have unequal ASCII 
                       values

      <       A <  B   TRUE if the ASCII value of string A is less 
                       than that of string B

      <=      A <= B   TRUE if the ASCII value of string A is less 
                       than or equal to that of string B

      >       A >  B   TRUE if the ASCII value of string A is greater 
                       than that of string B

      >=      A >= B   TRUE if the ASCII value of string A is greater
                       than or equal to that of string B

      IN      A IN B   TRUE if the string A is contained in string B
                       (This is identical to INDEX(B,A) <> 0)

      NOT IN  A NOT IN B
                       TRUE if the string A is not contained in string B
                       (This is identical to INDEX(B,A) = 0)