TurboDB Engine Documentation
Table and Column Names
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Identifiers consist of a true character followed by alphanumeric characters, the underscore _ and the hyphen. They can contain up to 40 characters. German umlauts count as true characters.
Valid identifiers are:
Column and Table Names
Column and table names can contain any ANSI characters but the control characters, the brackets  and the double quotes. The maximum length is 40 and it must start with a real character. If the name follows the rules for an identifier, it can be used normally in all expressions and statements. If it does not, it must be included either in double quotes or in brackets.
These are examples of invalid identifiers, which can be used as column names if enclosed in double quotes or brackets:
No of Items (spaces not allowed)
3645 (first character must be non-digit)