some tests

egeland/sql/Script.sql

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+drop table if exists clients_initial_timestamps;
+
+
+create temporary table clients_initial_timestamps as
+select
+	entity_id,
+	created_at as init_time
+FROM
+	(SELECT 
+		entity_id,
+		created_at,
+		row_number() over by_users as place
+	from 
+		db1.test.chat_messages cm 
+	where created_by = 0
+	window by_users as 
+		(partition by entity_id, created_by order by created_at)) t1
+where t1.place = 1;
+
+select * from clients_initial_timestamps;
+
+drop table if exists managers_response_timestamps;
+create temporary table managers_response_timestamps as
+select 
+	entity_id,
+	created_by as mop_id,
+	created_at as responce_time
+from 
+	(SELECT 
+		entity_id,
+		created_by,
+		created_at,
+		row_number() over by_users as place
+	from 
+		db1.test.chat_messages cm 
+	where created_by <> 0
+	window by_users as 
+		(partition by entity_id, created_by order by created_at)) t1
+where 
+	t1.place = 1;
+	
+select * from managers_response_timestamps;	
+	
+	
+select 
+	*,
+	mrt.responce_time - cit.init_time as delta
+from 
+	clients_initial_timestamps as cit
+	join 
+	managers_response_timestamps as mrt
+	on cit.entity_id = mrt.entity_id;
+
+select 
+	entity_id,
+	count(*) as cnt
+from 
+	db1.test.chat_messages cm
+group by entity_id 
+order by cnt desc
+
+select	
+	created_by,
+	created_at,
+	rank() over(order by created_by) as dr
+from 
+	db1.test.chat_messages cm 	
+where entity_id = 36541651
+order by created_at 
+	
+	
+select
+	*,
+	row_number() over(partition by entity_id order by created_at)
+from 
+	chat_messages cm 
+
+	
+	
+	
+	
+	
+select
+	type,
+	entity_id,
+	created_by,
+	created_at,
+	created_at - lag(created_at) over(partition by entity_id, type order by created_at) as prev_msg_time,
+	rank() over(partition by entity_id, type order by created_at) as nm
+from 
+	chat_messages cm
+where 
+	entity_id = 37529075
+order by created_at 
+offset 1;
+
+
+-- result
+with tmp as
+(select 
+	*,
+	created_at - lag(created_at) over(order by created_at) as diff
+from 
+	chat_messages cm 
+)
+select 
+--	*
+	tmp.created_by,
+	avg(diff)
+from 
+	tmp
+where 
+	tmp.diff is not null 
+	and
+	tmp.created_by <> 0
+group by tmp.created_by	
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