神秘的HAVING子句

Question

任何人都可以从Access数据库中解释以下HAVING子句吗？所有'0'格式的格式如何返回一串空格？

HAVING Format([PerNr],'0000000') <> '       '

Answer 1

如果字段值设置为空格......

VBA：

Dim x As String
x = "       "
MsgBox "x = " & Format(x, "0000000") & " : Len(x) = " & Len(Format(x, "0000000"))