如何在sql中顯示1行中的3行？

Question

我有1個問題在sql中

我該如何顯示3行的行？

這裏是我的SQL代碼

SELECT jobcard.code AS code1,jobcard.name AS name1,nvl(masterpm.id,0)toal 
FROM jobcard 
    LEFT JOIN masterpm ON jobcard.id = masterpm.jobcard_id 
        and masterpm.id in (select masterpm_id from cbmmasterpm) 

和圖像從選擇結果

現在我怎麼能顯示3特里行1行代碼，名稱不得到重複一遍，我真的很需要那

Answer 1

如果你正在使用MySQL，你可以使用GROUP BY和GROUP_CONCAT所有TOAL值如：

SELECT jobcard.code AS code1,jobcard.name AS name1, GROUP_CONCAT(NVL(masterpm.id,0)) AS toal 
FROM jobcard LEFT JOIN masterpm ON jobcard.id = masterpm.jobcard_id AND masterpm.id in (SELECT masterpm_id FROM cbmmasterpm) 
GROUP BY code1, name1; 

Here's關於GROUP_CONCAT的MySQL文檔。

更新

當你使用的是Oracle，你可以使用listagg函數來實現相同的功能，例如：

SELECT jobcard.code AS code1, jobcard.name AS name1, 
LISTAGG(NVL(masterpm.id,0), ', ') WITHIN GROUP (ORDER BY masterpm.id) "TOAL" 
FROM jobcard LEFT JOIN masterpm ON jobcard.id = masterpm.jobcard_id AND masterpm.id in (SELECT masterpm_id FROM cbmmasterpm) 
GROUP BY code1, name1; 

Here's的文檔。