如何在選擇查詢中創建新列

Question

在MS Access中，我想在選擇查詢的返回結果中插入一個新列。新列的每一行都有相同的值。例如，我選擇返回列A，B和我想C到被選擇查詢創建新列：

A B C 
---------- 
a1 b1 c 
a2 b2 c 
a3 b3 c 

Answer 1

select A, B, 'c' as C 
from MyTable 

Answer 2

這取決於你想例如與柱做什麼這裏是追加一個新列的記錄，可以在客戶端進行更新的例子：

Sub MSDataShape_AddNewCol() 

    Dim rs As ADODB.Recordset 
    Set rs = CreateObject("ADODB.Recordset") 
    With rs 
    .ActiveConnection = _ 
    "Provider=MSDataShape;" & _ 
    "Data Provider=Microsoft.Jet.OLEDB.4.0;" & _ 
    "Data Source=C:\Tempo\New_Jet_DB.mdb" 
    .Source = _ 
    "SHAPE {" & _ 
    " SELECT ExistingField" & _ 
    " FROM ExistingTable" & _ 
    " ORDER BY ExistingField" & _ 
    "} APPEND NEW adNumeric(5, 4) AS NewField" 

    .LockType = adLockBatchOptimistic 

    .Open 

    Dim i As Long 
    For i = 0 To .RecordCount - 1 
     .Fields("NewField").Value = Round(.Fields("ExistingField").Value, 4) 
     .MoveNext 
    Next 

    rs.Save "C:\rs.xml", adPersistXML 

    End With 
End Sub 

Answer 3

選擇場， 場2， 「例如」 AS野 FROM表1 這將增加一列名爲「新領域「的輸出，其價值將永遠是」示例「。