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SQLServer Identifier

Unquoted identifiers

Unquoted identifiers can use letters (a-z), digits (0-9), and underscore (_), and must start with a letter.

Depending on SQL implementation, and/or database settings, other characters may be allowed, some even as the first character, e.g.

.MS SQL: @, $, #, and other Unicode letters

.MySQL: $

.Oracle: $, #, and other letters from database character set

.PostgreSQL: $, and other Unicode letters

Unquoted identifiers are case-insensitive. How this is handled depends greatly on SQL implementation:

.MS SQL: Case-preserving, sensitivity defined by database character set, so can be case-sensitive.

.MySQL: Case-preserving, sensitivity depends on database setting and underlying file system.

.Oracle: Converted to uppercase, then handled like quoted identifier.

.PostgreSQL: Converted to lowercase, then handled like quoted identifier.

.SQLite: Case-preserving; case insensitivity only for ASCII characters.


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