Aggregates as window functions
Aggregate functions can be used as window functions as well. For instance, let's use the SUM() aggregate function as a window function for computing the sum of the successfully transferred amount per customer until each caching date, as illustrated in the following screenshot:
Figure 13.22 – Sum of the transferred amount until each caching date
The jOOQ query can be expressed like this:
ctx.select(BANK_TRANSACTION.CUSTOMER_NUMBER,  Â
  BANK_TRANSACTION.CACHING_DATE,
  BANK_TRANSACTION.TRANSFER_AMOUNT, BANK_TRANSACTION.STATUS,
  sum(BANK_TRANSACTION.TRANSFER_AMOUNT).over()
   .partitionBy(BANK_TRANSACTION.CUSTOMER_NUMBER)
   .orderBy(BANK_TRANSACTION.CACHING_DATE)
   .rowsBetweenUnboundedPreceding().andCurrentRow().as("result"))
  .from(BANK_TRANSACTION)
  .where(BANK_TRANSACTION.STATUS.eq("...
