在MS-Access中查询“无匹配”关键字的语法吗？

Question

I found a very strange looking query in one of the MS-Access databases today:

SELECT Count([hrpersnl Without Matching T_Employees].EmpNo) AS [Count]
FROM [hrpersnl Without Matching T_Employees];

The Without Matching clause seems to me to be rather MS-Access specific syntax that differs from ANSI-SQL as a whole, it appears to me to be finding records that have no matches on the EmpNo field of both tables, but the T_Employees table does not have a EmpNo field, so I am probably wrong in my assumption about this.

What does it actually do, and where is the documentation for it?

Answer 1

In an Access query, table/query and field names that

• contain spaces and "funny characters", or

• are Access reserved words

must be enclosed in [square brackets]. In this case, [hrpersnl Without Matching T_Employees] was a table or query name, not an expression involving the base tables hrpersnl and T-Employees .