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Identifiers

Naming restrictions

  • The first character of an identifier must be an ASCII letter (e.g., a-z and A-Z) or an underscore (_).
  • The remaining characters of an identifier must be ASCII letters (e.g., a-z and A-Z), underscores (_), ASCII digits (0-9), or dollar signs ($).
  • Non-ASCII characters in unquoted identifiers are not allowed.
  • You can circumvent any above rules by double-quoting the identifier (e.g., "5_source"). All characters inside a quoted identifier are taken literally, except double-quotes must be escaped by writing two adjacent double-quotes, as in (e.g., "two""quotes").

Case sensitivity

Identifiers are case-insensitive. It means wave, WAVE, and wAve are the same identifier in RisingWave. This can cause issues when column names come from data sources that do support case-sensitive names, such as Avro-formatted sources or CSV headers.

To avoid conflicts, double-quote all field names (e.g., "field_name") when working with case-sensitive sources.

RisingWave processes unquoted identifers as in lower cases. If you create a table named WAVE, it will display as wave when you choose to list all tables. You can reference it by wave, WAVE, or a combination of upper- and lower cases in SQL statements.

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