From 449c1db7bae89db19119a8dd9e3a0767dabe7aab Mon Sep 17 00:00:00 2001
From: Alex <n_alex2001@mail.ru>
Date: Wed, 6 Nov 2019 00:19:40 +0300
Subject: [PATCH] =?UTF-8?q?=D0=92=D1=81=D0=B5=20=D1=81=D0=B4=D0=B5=D0=BB?=
 =?UTF-8?q?=D0=B0=D0=BB?=
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---
 lesson06/task1.sql | 17 +++++++++++++++++
 lesson06/task2.sql |  8 ++++++++
 lesson06/task3.sql | 23 +++++++++++++++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 lesson06/task1.sql
 create mode 100644 lesson06/task2.sql
 create mode 100644 lesson06/task3.sql

diff --git a/lesson06/task1.sql b/lesson06/task1.sql
new file mode 100644
index 0000000..f426217
--- /dev/null
+++ b/lesson06/task1.sql
@@ -0,0 +1,17 @@
+use vk;
+
+SET @u_id = 1; #Задаем ID исходного пользователя
+#select @u_id;
+
+select u.id, u.firstname, u.lastname, C
+from (select 
+	  		IF(from_user_id = @u_id,to_user_id,from_user_id) as boltun, #Получаем ID собеседника
+	  		id,
+	  		Count(id) as C	  		
+	  from messages 
+      where from_user_id = @u_id or to_user_id = @u_id
+      group by boltun
+      having C) as a, users as u
+where
+	  a.id = u.id
+limit 1
diff --git a/lesson06/task2.sql b/lesson06/task2.sql
new file mode 100644
index 0000000..38763ac
--- /dev/null
+++ b/lesson06/task2.sql
@@ -0,0 +1,8 @@
+use vk;
+
+select Count(*)
+from users as u,media as m,likes as l,profiles as p
+where u.id = m.user_id and
+      m.id = l.media_id and
+      u.id = p.user_id and
+      timestampdiff(year,p.birthday,now()) < 10
\ No newline at end of file
diff --git a/lesson06/task3.sql b/lesson06/task3.sql
new file mode 100644
index 0000000..1f8b00c
--- /dev/null
+++ b/lesson06/task3.sql
@@ -0,0 +1,23 @@
+use vk;
+
+select IF(gender = "f","female","male") as gender_win
+from 
+	(select p.gender,Count(*) as count_likes
+	from likes as l 
+			left join 
+		 users as u on l.user_id = u.id 
+		 	inner join
+		 profiles as p on u.id = p.user_id	
+	where 
+    	  p.gender = "f"
+      	union
+	select p.gender,Count(*)
+	from likes as l 
+			left join 
+		 users as u on l.user_id = u.id 
+		 	inner join
+		 profiles as p on u.id = p.user_id
+	where 
+   	   p.gender = "m") as res
+order by count_likes desc
+limit 1
\ No newline at end of file