2 задачка по СКЛ. Вроде норм

aysat/lifecoding/SQL2.sql

@@ -0,0 +1,23 @@
+with base as (
+select
+employee_id,
+to_dt,
+from_dt,
+lag(to_dt) over (partition by employee_id order by from_dt) lag_to_dt
+from abakhytbekuly.salary
+),
+error as (
+select 
+employee_id,
+from_dt,
+case when
+     lag_to_dt > from_dt then 'пересечение'
+     when 
+     lag_to_dt < from_dt then 'дыра'
+     end as status
+from base
+where lag_to_dt is not null  
+)
+select *
+from error
+order by employee_id, from_dt