Question

我在将查询结果的所有行合并到一行时遇到问题。

这是我成绩的总结

Column1    Column2                   Column3           Column4
1900200196 Null                                                          
1900200196 Null
1900200196 Null                      Intake and assmnt/eva
1900200196 Null                                        Staff interpreter 
1900200196 INTERPRETER
1900200196 Null

我希望我的结果看起来像这样

Column1     Column2              Column3             Column4
1900200196  MEDICAL INTERPRETER  Staff interpreter   Intake and assmnt/eval

在正确方向上的任何帮助都可以。

Answer 1

select column1, 
       max(column2) as column2,
       max(column3) as column3,
       max(column4) as column4
from your_table
group by column1

Answer 2

好像您要聚合：

with A as (
    select 1900200196 as column1, null as column2, 'INTERPRETER' as column3, 'foo' as column4 FROM DUAL
    UNION
    select 1900200196, 'M', null, null FROM DUAL
)
SELECT column1, MAX(column2) column2, MAX(column3) column3, MAX(column4) column4 FROM A GROUP BY column1

   COLUMN1 | COLUMN2 | COLUMN3     | COLUMN4
---------: | :------ | :---------- | :------
1900200196 | M       | INTERPRETER | foo

db <>提琴here

如何将多行合并/分组为一行

2 个答案: