如何解决如何根据另一列的值在 SQL 选择查询中创建/添加列作为返回输出？
我已使用 Case 语句向 SQL 视图动态添加一列 (industry_type)。现在我想使用相同的列名/值添加另一个带有 industry_group 输出的动态列。我尝试使用相同的方法创建 industry_group 列。但我无法这样做，因为在视图中创建的列在“主表”中不可用。
我是否需要在源代码处创建一个带有 industry_group 的新列？或者有没有办法在同一个视图中动态创建它并返回 industry_group 值？
如果你能帮我解决这个问题，那将是一个很大的帮助。
示例代码：
select
column 1,column 2,date,case
when (column 1 like '%12321%' or column 2 like'%poultry%'
then 'Poultry Facilities'
when (column 1 like '%43434%') or column 2 like'%Hospi%'
then 'Hospitals'
else null
end as [industry_type],from table
输出：
Date Industry Type
------------------------------
7/02/2021 Poultry facilities
7/02/2021 Poultry facilities
7/02/2021 Poultry facilities
10/02/2021 Poultry facilities
11/01/2021 Hospitals
10/01/2021 Hospitals
5/02/2021 Hospitals
试过这个脚本1：
select
column 1,case
when (column 1 like '%12321%' or column 2 like'%poultry%'
then 'Poultry Facilities'
when (column 1 like '%43434%') or column 2 like'%Hospi%'
then 'Hospitals'
else null
end as [industry_type],'PF' as industry_group,from table
输出：
Date Industry Type Industry Group
----------------------------------------------
7/02/2021 Poultry facilities PF
7/02/2021 Poultry facilities PF
7/02/2021 Poultry facilities PF
10/02/2021 Poultry facilities PF
11/01/2021 Hospitals PF
10/01/2021 Hospitals PF
5/02/2021 Hospitals PF
试过脚本 2
select
column 1,case
when (column 1 like '%12321%' or column 2 like'%poultry%'
then 'Poultry Facilities'
end as [industry_type],case
when (column 1 like '%43434%') or column 2 like'%Hospi%'
then 'Hospitals'
else null
end as [industry_type],'HOS' as industry_group,from table
不幸的是，“脚本 2”不起作用。
所需的输出：
Date Industry Type Industry Group
---------------------------------------
7/02/2021 Poultry facilities PF
7/02/2021 Poultry facilities PF
7/02/2021 Poultry facilities PF
10/02/2021 Poultry facilities PF
11/01/2021 Hospitals HOS
10/01/2021 Hospitals HOS
5/02/2021 Hospitals HOS
我有超过 10 个搜索条件，我需要根据这些条件返回正确的行业组
请注意：industry_type 在“主表”中不可用
谢谢大家！
解决方法
您的输出似乎与查询不匹配：查询未显示任何列日期，我希望输出包含 3 列：
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</div>相反，它只有 2 个
如果您粘贴实际代码而不是 excel 中的图片会有所帮助
无论如何要在选择中添加一列，只需将其添加到字段中即可：
Column1,column2,industry_type
问题增强后更新
每一列本身就是一个规则，如果你想让它依赖于前一个，你应该重写规则两次，或者进行嵌套查询
第一个例子
SELECT column1,case
...
END AS industry_type,"PF" as industry_group
FROM table;
第二个例子
select
column 1,column 2,date,case
when (column 1 like '%12321%' or column 2 like'%poultry%'
then 'Poultry Facilities'
when (column 1 like '%43434%') or column 2 like'%Hospi%'
then 'Hospitals'
else null
end as [industry_type],case
when (column 1 like '%12321%' or column 2 like'%poultry%'
then 'PF'
when (column 1 like '%43434%') or column 2 like'%Hospi%'
then 'HOS'
else null
end as [industry_group],from table
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