Question

我正在尝试将两个记录合并为一个，我看到了一些类似的问题，但这些似乎不是数据库中的特定记录

 SELECT Summary1 as a, Summary2 as b, Summary3 as c, DateUpdated as d
FROM  tbl_EC where id=1

SELECT Summary1 as e, Summary2 as f, Summary3 as g, DateUpdated as h
FROM  tbl_EC where id=2

Answer 1

自我加入：

SELECT t1.Summary1 as a, t1.Summary2 as b, t1.Summary3 as c, t1.DateUpdated as d,
       t2.Summary1 as e, t2.Summary2 as f, t2.Summary3 as g, t2.DateUpdated as h
FROM  tbl_EC t1
    JOIN tbl_EC t2 ON t1.id + 1 = t2.id
WHERE t1.ID = 1

如果可能缺少任何ID，或许您想切换到FULL OUTER JOIN？

SELECT t1.Summary1 as a, t1.Summary2 as b, t1.Summary3 as c, t1.DateUpdated as d,
       t2.Summary1 as e, t2.Summary2 as f, t2.Summary3 as g, t2.DateUpdated as h
FROM  tbl_EC t1
    FULL OUTER JOIN tbl_EC t2 ON t1.id + 1 = t2.id
                             and (t1.id % 2 = 1 or t2.id % 2 = 0)

将2条记录合并为一条

1 个答案: