如何在sql中显示3行1行？

Question

我在sql中有一个问题

如何在行中显示3行？

这是我的sql代码

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)

和选择结果的图像

现在我怎么能在1行显示3行代码和代码，名字不要重复我真的需要那个

Answer 1

如果您使用MySQL，则可以使用GROUP BY和GROUP_CONCAT所有TOAL值，例如：

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 GROUP_CONCAT。

的MySQL文档

<强>更新

在使用Oracle时，您可以使用listagg函数来实现相同的功能，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文档。