Sql 将数据库记录合并为1个记录

我想把这两行合并成一行，不留下空字段

我正在使用MS SQL Server 2016：

MS SQL Server 2017架构设置：

CREATE TABLE MyTable (
     ActivityId int,
     CaseId int, 
     Description varchar(255),
     Actions varchar(255)
);

INSERT INTO MyTable (ActivityId,CaseId,Description,Actions) VALUES 
(229189,35057152,NULL,'DELETED'),
(229189,NULL,'DO','DELETED');

SELECT 
     Max(ActivityId) AS ActivityId,
     Max(CaseId) AS CaseId,
     Max(Description) AS Description,
     Max(Actions) AS Actions 
FROM MyTable
GROUP BY ActivityId;

| ActivityId |   CaseId | Description | Actions |
|------------|----------|-------------|---------|
|     229189 | 35057152 |          DO | DELETED |

查询1：

CREATE TABLE MyTable (
     ActivityId int,
     CaseId int, 
     Description varchar(255),
     Actions varchar(255)
);

INSERT INTO MyTable (ActivityId,CaseId,Description,Actions) VALUES 
(229189,35057152,NULL,'DELETED'),
(229189,NULL,'DO','DELETED');

SELECT 
     Max(ActivityId) AS ActivityId,
     Max(CaseId) AS CaseId,
     Max(Description) AS Description,
     Max(Actions) AS Actions 
FROM MyTable
GROUP BY ActivityId;

| ActivityId |   CaseId | Description | Actions |
|------------|----------|-------------|---------|
|     229189 | 35057152 |          DO | DELETED |

：

CREATE TABLE MyTable (
     ActivityId int,
     CaseId int, 
     Description varchar(255),
     Actions varchar(255)
);

INSERT INTO MyTable (ActivityId,CaseId,Description,Actions) VALUES 
(229189,35057152,NULL,'DELETED'),
(229189,NULL,'DO','DELETED');

SELECT 
     Max(ActivityId) AS ActivityId,
     Max(CaseId) AS CaseId,
     Max(Description) AS Description,
     Max(Actions) AS Actions 
FROM MyTable
GROUP BY ActivityId;

| ActivityId |   CaseId | Description | Actions |
|------------|----------|-------------|---------|
|     229189 | 35057152 |          DO | DELETED |

---

用于查看，或通过物理方式将表中的2行合并为1？用于查看，因此。。。分组并使用max…你怎么能使用max description？就像你做其他事情一样<代码>最大值（说明）。。。因此，如果一条记录为空/空，则另一个值将是最大值，并将被选中。如果数据真的如所描述的那样，那应该是可行的。但是如果在替代行中填写描述或caseId。。。那么。。这需要更多的技巧…我会将ActivityId和动作保留在最大值之外，但会将它们用于group by。OP中不清楚的是，行动是否可以或将有所不同，以及/或在这些情况下该怎么做。不幸的是，给出的样本数据太窄。