选择N并在Access中显示N个随机行

Question

我需要从简单查询中选择特定数量的随机行。该号码以([Formulários]![Survey]![SelectSurveySample])的形式指定。 如果我尝试选择TOP 5，它可以工作，但我想在表单中更改此数字。

SELECT TOP ([Formulários]![Survey]![SelectSurveySample]) * 
FROM [main_table] mt 
WHERE (((mt.CPA_Number)=[Formulários]![Survey]![selectCPA_Survey]) 
AND ((mt.Sample_Household)=False) AND ((mt.Functionality_Survey)=False)) 
ORDER BY rnd(Int(Now*ID)-Now*Id) 

Answer 1

有你试图消除括号 ...

SELECT TOP [Formulários]![Survey]![SelectSurveySample] * 
FROM main_table 
WHERE (((main_table.CPA_Number)=[Formulários]![Survey]![selectCPA_Survey]) 
AND ((main_table.Sample_Household)=False) 
AND ((main_table.Functionality_Survey)=False)) 
order by rnd(Int(Now*ID)-Now*Id) 

，因为这可与更改为SELECT TOP 5，和你有一个表单变量[Formulários]![Survey]![selectCPA_Survey]在查询中，我看到的唯一的区别括号。