我想在MySQL中做一個EXCEPT/MINUS。如果主鍵是可利用的,明顯的解決辦法是: SELECT
*
FROM
table_a AS a
WHERE
a.ID not in(
SELECT
b.ID
FROM
table_b AS b
)
但是,如果我沒有一個鍵列,我想一組實際的差異,即考慮到所
Public Sub ChatMessage(ByVal sUser As String, ByVal sMessage As String)
Dim tmpData As String = sUser & ":" & vbTab & sMessage
Dim p As Paragraph = New Paragraph(New Run(tmpData))
p.For