A quoted user-defined identifier is enclosed in double quotation marks.
Between the double quotation marks, any characters from the database character set are allowed except
For example, these identifiers are acceptable:
"X+Y+Z" "first name" "on/off" "student(s)" "*** title ***" "TABLE" --reserve word
The quoted identifier cannot exceed 30 bytes excluding the double quotation marks.
A quoted user-defined identifier is case-sensitive.
If a quoted identifier without quotation is a valid identifier, then the quotation marks are optional in references to the identifier. Then reference to it is case-insensitive.