LENGTH (field variable or literal)
The LENGTH function returns the length in bytes of a field variable or literal. One parameter is required, which identifies the value to be examined. The maximum size of the field is returned.
If all of the parameters of a LENGTH function are literal values (or literal expressions), then the function is evaluated immediately when encountered in the command input. The result is treated as a literal value and can be used anywhere that a simple literal value can be used (on any keyword). For example, the literal function LENGTH ('ABC') is the same as 3.
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