从 mySQL 到 msSQL Sum Query 的转换不起作用

Question

我一直在阅读多个论坛并到处寻找答案，但我似乎找不到与我遇到的问题相似的人。我们目前正在将数据库从 mySQL 迁移到 msSQL。我在 mySQL 中有一个查询，它非常适合我需要它做的事情，但我似乎无法在 msSQL 中弄清楚。我想要做的是显示有多少计算机将在某一年更换，有多少不符合条件，有多少正在进行中，有多少已完成，同时保持初始总数。这是我在 mySQL 中的内容

SELECT RefreshCycle, 
       Count(*) - sum(RefreshStatus = 'Not Eligible') as Total,
       sum(RefreshStatus = 'Completed') as 'Completed', 
       sum(RefreshStatus = 'Not Started') as 'Not Started', 
       sum(RefreshStatus = 'In Progress') as 'In Progress', 
       sum(RefreshStatus = 'Not Eligible') as 'Not Eligible' 
FROM [InventoryDatabase].[dbo].[Hardware_Inventory] 
group by RefreshCycle, RefreshStatus 
order by RefreshCycle asc; 

这给了我一个表格结果

目前我为数据库中的每个计算机条目都有名为 RefreshCycle 和 RefreshStatus 的列，我需要能够执行此报告，我对此感到困惑，我不知道为什么 SQL 告诉我我有我的总和语法不正确。任何帮助将不胜感激

Answer 1

试试这个：

SELECT RefreshCycle, 
       Count(*) - sum(CASE WHEN RefreshStatus = 'Not Eligible' THEN 1 ELSE 0 END) as Total,
       sum(CASE WHEN RefreshStatus = 'Completed' THEN 1 ELSE 0 END) as 'Completed', 
       sum(CASE WHEN RefreshStatus = 'Not Started' THEN 1 ELSE 0 END) as 'Not Started', 
       sum(CASE WHEN RefreshStatus = 'In Progress' THEN 1 ELSE 0 END) as 'In Progress', 
       sum(CASE WHEN RefreshStatus = 'Not Eligible' THEN 1 ELSE 0 END) as 'Not Eligible' 
FROM [InventoryDatabase].[dbo].[Hardware_Inventory] 
group by RefreshCycle 
order by RefreshCycle;

在 SQL Server 2012+ 中，这可以简化为：

SELECT RefreshCycle, 
       Count(*) - sum(IIF(RefreshStatus = 'Not Eligible', 1, 0)) as Total,
       sum(IIF(RefreshStatus = 'Completed', 1, 0)) as 'Completed', 
       sum(IIF(RefreshStatus = 'Not Started', 1, 0)) as 'Not Started', 
       sum(IIF(RefreshStatus = 'In Progress', 1, 0)) as 'In Progress', 
       sum(IIF(RefreshStatus = 'Not Eligible', 1, 0)) as 'Not Eligible' 
FROM [InventoryDatabase].[dbo].[Hardware_Inventory] 
group by RefreshCycle 
order by RefreshCycle;