Sql server 使用pivot函数时为空值

使用tsql，我需要在不同的分组和支付状态中对许多列进行汇总

之前：

+---------------+----------+----------------------------+
| policy number | Grouping |          £ Amount          |
+---------------+----------+----------------------------+
| #123          | a        | £1 (for issued payment)    |
| #123          | b        | £11(for cancelled payment) |
| #123          | a        | £21(for cancelled payment) |
| #123          | b        | £31(for issued payment)    |
+---------------+----------+----------------------------+

期望在以下时间之后：

+--------+----------------+----------------+-------------------+-------------------+
| policy | Group a Issued | Group b Issued | Group a cancelled | Group b cancelled |
+--------+----------------+----------------+-------------------+-------------------+
| #123   | £1             | £31            | £21               | £11               |
+--------+----------------+----------------+-------------------+-------------------+

尽管在before表中生成求和列时使用了isnull函数，但我的所有结果都是null。我已经彻底检查了预透视表，没有空值

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注意：因为我必须在多个付款类型之间进行分组，所以我不得不使用重复的分组列。

如果您发布tsql，我们可以确定您的错误可能在哪里。请发布您的查询，否则没有人可以帮助您。很抱歉，我解决了此问题，但回复太晚