在同一列mysql查詢中檢查不同的數據值？

Question

id_detail_item id_item id_detail_item_name 
1    1   abc 
2    1   abcd 
3    1   cde 
4    3   zki 
5    3   zkr 

如何檢查同一個「id_item」中的「id_detail_item_name」中是否有兩個不同的數據？

我試過以下，但得到了一個錯誤：

SELECT id_item FROM table_detail_item WHERE id_detail_item_name='abc' AND id_detail_item_name='abcd'; 

Answer 1

這是因爲與運算意味着這兩個條件必須得到滿足。

嘗試：

SELECT * FROM table_detail_item 
WHERE id_item = '1' 
AND id_detail_item_name IN ('abc', 'abcd'); 

Answer 2

這應該列出與至少兩種不同的id_detail_item_name爲id_item

SELECT id_item, MIN(id_detail_item_name) nam1,max(id_detail_item_name) nam2 
FROM table_detail_item 
GROUP by id_item HAVING MIN(id_detail_item_name) nam1<MAX(id_detail_item_name) 

Answer 3

所有條目嘗試

select id_item 
    from (
       select min(id_detail_item_name) mmin 
        , max(id_detail_item_name) mmax 
       from table_detail_item 
      group by id_item 
     ) agg 
where agg.mmin <> agg.mmax 
    ;