如何在訪問

Question

時查詢「哪裏是數字（col）和col> 0」我正在清理訪問數據庫中的某些數據，其中文本屬性應該是數字且大於0包含非數字數據或者是數字0 <

因爲Access沒有短路，我不能做一個

create table cleaned_up as 
select * from a_mess 
where isNumeric(col) and col >0 

有

create table cleaned_up as 
select * from (
    select * from a_mess 
    where isNumeric(col) 
) 
where col > 0 

Answer 1

關注只是SELECT片開始...

SELECT * 
FROM a_mess 
WHERE 
     IsNumeric(col) 
    AND Val(Nz(col, 0)) > 0; 

然後你就可以在查詢適應作爲SELECT ... INTO聲明（訪問用戶界面稱爲「生成表」查詢）將結果集作爲表保留...

SELECT * 
INTO cleaned_up 
FROM a_mess 
WHERE 
     IsNumeric(col) 
    AND Val(Nz(col, 0)) > 0; 

Answer 2

您可以瓦爾的解決辦法短，我噸開始與非數字字符的字符串返回0：

create table cleaned_up as 
select * from a_mess 
where Val(col) > 0