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content/blog/draft/sql_over_partition.md

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+title = "sql over partition"
++++
+
+write and learn how over partition works
+
+we had duplicates in our databases, needed to delete all of them except one
+so had to query them, groupped together and know which one was a duplicate
+so it can be removed safely and keep one occurence of each
+
+```
+select * from (
+	select
+		row_number() over (partition by column_name order by column_name2 desc) as row_num,
+		* from table_name
+	where
+		type = 'xxx'
+		and content->'prop_name'->>'prop_name2' = 'xxx'
+		and column_name3 > now() - interval '12 hours'
+) as rn
+where row_num > '1'
+;
+```