Question

我在Access 2013中的数据库中有一个表。

Table : city

ID_city city
1       Tetuan
5       Rabat
9       Marrakech
10      Agadir
15      Laayoun

我希望在它们旁边添加Rowid编号：

Rowid   ID_city city
1       1       Tetuan
2       5       Rabat
3       9       Marrakech
4       10      Agadir
5       15      Laayoun

Answer 1

执行此操作的一种方法是在子查询中使用count函数。不确定它是否能够很好地扩展，并且可能有更好的方法......

select 
    (select count(*) from city where ID_city <= t1.ID_city) as row_number,
    *
from city t1

Answer 2

最好的方法是使用自我加入......

    SELECT
    COUNT(*) AS Rowid,
    C.ID_City,
    C.city
    FROM City C
    INNER JOIN City C1 ON C.ID_City >= C1.ID_City
    GROUP By C.ID_City, C.city

Answer 3

一点VBA还有很长的路要走......

127.0.0.1

SQL语句：

'Module level variables; values will persist between function calls
'To reset the row number, you have to explicitly call Reset
Dim lastValue As Integer

Public Function RowNumber(x) As Integer
    'We need this parameter so Access will call the function on each row, instead of only once
    lastValue = lastValue +1
    RowNumber = lastValue
End Function

Public Sub Reset()
    lastValue = 0
End Sub

Answer 4

另一种选择：（http://www.openwinforms.com/row_number_to_sql_select.html）

  SELECT ROW_NUMBER() 
  OVER (ORDER BY ID_city) AS Rowid, 
  ID_City, city
  FROM city

在查询中添加行号

4 个答案: