A sequence of characters enclosed in double quotes ("aBc") is called a string. String parameters vary in length from 0 (zero) to 64 characters. A string with no characters in it (i.e., has a length of zero) is called a null string. For example "A2" has a length of two but "" (adjacent double quotes) has a length of zero and is a null string. In the case of a string parameter, the null string may be interpreted as a missing value. Some application tasks may require non-null string(s) before executing.
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