How can you combine named windows with filtering rows using FILTER clause inside aggregate functions?

hard📝 Application Q9 of 15

PostgreSQL - Window Functions in PostgreSQL

How can you combine named windows with filtering rows using FILTER clause inside aggregate functions?

ANamed windows cannot be used with FILTER

BDefine FILTER inside WINDOW clause

CUse named windows for partition/order and apply FILTER inside aggregate functions separately

DFILTER clause replaces WINDOW clause

Step-by-Step Solution

Solution:

Step 1: Understand FILTER and WINDOW roles
FILTER applies conditions inside aggregates; WINDOW defines partition/order for window functions.
Step 2: Check compatibility
FILTER is used inside aggregate calls; WINDOW clause is separate and can be combined with FILTER usage.
Final Answer:
Use named windows for partition/order and apply FILTER inside aggregate functions separately -> Option C
Quick Check:
FILTER and WINDOW clauses work independently but together [OK]

Quick Trick: FILTER filters rows inside aggregates; WINDOW defines partitions [OK]

Common Mistakes:

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