Sql 如何按表达式进行分区

我想用表达式而不是字段进行分区。接受这个查询

SELECT 
      ID,
      Value,
      Status,
      SUM(Value) OVER(PARTITION BY ID) AS "Sum",
      COUNT(*) OVER(PARTITION BY ID, Status = 'Ready') AS ReadyCount --Error here
FROM TestAggregation

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我需要获得分组状态的ReadyCount，但只需要将计数应用于就绪状态。这可能吗？

您可以使用条件和：

SELECT 
      ID,
      Value,
      Status,
      SUM(Value) OVER(PARTITION BY ID) AS "Sum",
      SUM(CASE WHEN Status = 'Ready' THEN 1 ELSE 0 END) OVER(PARTITION BY ID) AS ReadyCount --Error here
FROM TestAggregation

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在查看文档中的OVER条款后，我删除了该评论。