As I needed to know which other characters besides $ are allowed in MSSQL identifiers: [WayBack] Database Identifiers | Microsoft Docs
The 2017 specs:
There are two classes of identifiers:
Regular identifiers
Comply with the rules for the format of identifiers. Regular identifiers are not delimited when they are used in Transact-SQL statements.
SELECT *
FROM TableX
WHERE KeyCol = 124
Delimited identifiers
Are enclosed in double quotation marks (“) or brackets ([ ]). Identifiers that comply with the rules for the format of identifiers might not be delimited. For example:
SELECT *
FROM [TableX] --Delimiter is optional.
WHERE [KeyCol] = 124 --Delimiter is optional.
Identifiers that do not comply with all the rules for identifiers must be delimited in a Transact-SQL statement. For example:
SELECT *
FROM [My Table] --Identifier contains a space and uses a reserved keyword.
WHERE [order] = 10 --Identifier is a reserved keyword.
Both regular and delimited identifiers must contain from 1 through 128 characters. For local temporary tables, the identifier can have a maximum of 116 characters.
Rules for Regular Identifiers
The names of variables, functions, and stored procedures must comply with the following rules for Transact-SQL identifiers.
- The first character must be one of the following:
- Subsequent characters can include the following:
- Letters as defined in the Unicode Standard 3.2.
- Decimal numbers from either Basic Latin or other national scripts.
- The at sign, dollar sign ($), number sign, or underscore.
- The identifier must not be a Transact-SQL reserved word. SQL Server reserves both the uppercase and lowercase versions of reserved words. When identifiers are used in Transact-SQL statements, the identifiers that do not comply with these rules must be delimited by double quotation marks or brackets. The words that are reserved depend on the database compatibility level. This level can be set by using the ALTER DATABASE statement.
- Embedded spaces or special characters are not allowed.
- Supplementary characters are not allowed.When identifiers are used in Transact-SQL statements, the identifiers that do not comply with these rules must be delimited by double quotation marks or brackets.
Note
Some rules for the format of regular identifiers depend on the database compatibility level. This level can be set by using ALTER DATABASE.
Related: [WayBack] ALTER DATABASE Compatibility Level (Transact-SQL) | Microsoft Docs
–jeroen
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