Ms access ALTER TABLE：添加带有默认值和复选框的新布尔列

向表中添加布尔数据类型列的正确访问DDL查询是什么

到目前为止，我已经看到了如下示例

ALTER TABLE MyTable ADD MyNewColumName BIT

但他们似乎并不是100%正确的

Access不会将复选框控件应用于新添加的列，并且

该列的允许值似乎是

0

和

-1

---

在access中，是/否数据类型是一个逻辑字段，可以显示是/否、真/假或开/关。查看VBA代码时，true和false常量等效于-1和0

如果使用此字段填充复选框，它将正常工作

您可以将alter语句更改为使用“YESNO”：

这将在access table列中为您提供所需的复选框。

DAO示例

''Requires reference to Microsoft DAO 3.6 Object Library
Dim tdf As DAO.TableDef
Dim fld As DAO.Field
Dim db As Database
Dim strSQL As String


Set db = CurrentDb

''Create a table ...
strSQL = "Create Table tblLTD (TheYesNoCheck YesNo, TheYesNoCombo YesNo)"
db.Execute strSQL

''It is now in the table collection, so ...
Set tdf = db.TableDefs("tblLTD")

''Change the way the YesNo fields display.
''A Checkbox
Set fld = tdf.Fields("TheYesNoCheck")
Set prp = fld.CreateProperty("DisplayControl", dbInteger, acCheckBox)
fld.Properties.Append prp

''A combobox
Set fld = tdf.Fields("TheYesNoCombo")
Set prp = fld.CreateProperty("DisplayControl", dbInteger, acComboBox)
fld.Properties.Append prp
''We will need a format
Set prp = fld.CreateProperty("Format", dbText, "Yes/No")
fld.Properties.Append prp

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From:

恐怕不会，复选框只能通过DAO获得。这个问题不是关于设置字段的数据类型，而是关于设置默认的显示控件（您的标题有误导性）。正如@Remou在下面所说的，这不是DDL可以设置的。

''Requires reference to Microsoft DAO 3.6 Object Library
Dim tdf As DAO.TableDef
Dim fld As DAO.Field
Dim db As Database
Dim strSQL As String


Set db = CurrentDb

''Create a table ...
strSQL = "Create Table tblLTD (TheYesNoCheck YesNo, TheYesNoCombo YesNo)"
db.Execute strSQL

''It is now in the table collection, so ...
Set tdf = db.TableDefs("tblLTD")

''Change the way the YesNo fields display.
''A Checkbox
Set fld = tdf.Fields("TheYesNoCheck")
Set prp = fld.CreateProperty("DisplayControl", dbInteger, acCheckBox)
fld.Properties.Append prp

''A combobox
Set fld = tdf.Fields("TheYesNoCombo")
Set prp = fld.CreateProperty("DisplayControl", dbInteger, acComboBox)
fld.Properties.Append prp
''We will need a format
Set prp = fld.CreateProperty("Format", dbText, "Yes/No")
fld.Properties.Append prp