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Showing content from https://docs.databricks.com/aws/en/sql/language-manual/sql-ref-identifiers below:

Identifiers | Databricks Documentation

-- This statement fails because the undelimited identifier uses a non-ASCII letter.
> DESCRIBE SELECT 5 AS Ä;
 INVALID_IDENTIFIER

-- You can delimit the identifier to use a non-ASCII letter
> DESCRIBE SELECT 5 AS `Ä`;
 Ä

-- An identifier with dash needs to be delimited
> DESCRIBE SELECT 5 AS `a-b`;
 a-b

-- An identifier with a space needs to be delimited
> DESCRIBE SELECT 5 AS `a b`;
 a b

-- An identifier with a special character needs to be delimited
> DESCRIBE SELECT 5 AS `a@b`;
 a@b

-- An identifier with a Chinese character needs to be delimited
> DESCRIBE SELECT 5 AS `a中b`;
 a中b

-- An identifier with a backtick needs to be delimited and escaped.
> DESCRIBE SELECT 5 AS `a``b`;
 a`b

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