Why does Microsoft SSMS syntax highlight the word “configuration”?

问题

When using Microsoft SQL Server Management Studio 14.0.17254.0 and it's query editor, I noticed that the word configuration is always syntax highlighted as a blue keyword. Even though it doesn't appear to be in the list of Reserved Keywords. Is this a keyword in some other SQL standard or has this been a keyword before? Is there any reason this should be highlighted with the same color as SELECT or WHERE?

I found similar question asking about other keywords, and they all seemed to have logical reasons, but couldn't find anything for this word.

Primary reason for this question is that I want to know if using this as a column name in queries without the the brace encapsulation [configuration] is completely safe.

回答1:

There are both Reserved Keywords, and Keywords in SQL Server. CONFIGURATION is a keyword, but it isn't reserved. Just like int (for the datatype int), and other words, are a keyword , but you could still use it in a statement unquoted:

CREATE TABLE sample (int int,
                     date date,
                     char varchar(10),
                     last decimal(12,2),
                     first numeric(12,2),
                     system char(2));

Every single word there is a keyword of some kind (including sample), but only CREATE and TABLE are reserved. char is even a datatype and a function and isn't reserved, so you could have a nonsensical statement like CONVERT(char,CHAR(Char)), and every reference to "char" has a different meaning.

CONFIGURATION isn't a future keyword either, so at this time, you would seem fine to use it.

来源：https://stackoverflow.com/questions/56044348/why-does-microsoft-ssms-syntax-highlight-the-word-configuration