update my files and add Demin (#53)

* Add files via upload

* Add files via upload

task1/Demin_1_1.sql

@@ -0,0 +1,9 @@
+SELECT 
+	customer_rk, 
+    CASE
+		WHEN middle_nm LIKE '%ИЧ' THEN 'M' 
+		WHEN middle_nm LIKE '%НА' THEN 'F'
+		ELSE NULL
+    END AS gender 
+FROM cd_customers
+WHERE valid_to_dttm = '5999-01-01 00:00:00'

task1/Demin_1_2.sql

@@ -0,0 +1,5 @@
+SELECT monthly_income_amt as the_most_income
+FROM cd_customers 
+WHERE valid_from_dttm >= '2014-01-01 00:00:00' AND valid_from_dttm < '2015-01-01 00:00:00'
+ORDER BY monthly_income_amt DESC
+LIMIT 10

task1/Demin_1_3.sql

@@ -0,0 +1,4 @@
+SELECT CONCAT(SUBSTR(birth_dt, 1, 3), '0-e') as generation
+FROM cd_customers
+WHERE valid_to_dttm = '5999-01-01 00:00:00'
+GROUP BY generation DESC

task1/Popov_1_1.sql

@@ -1,5 +1,3 @@
-USE srcdt;
-
 SELECT
 	customer_rk,
 	CASE

task1/Popov_1_2.sql

@@ -1,5 +1,3 @@
-USE srcdt;
-
 SELECT 
 	monthly_income_amt AS monthly_income2014
 FROM

task1/Popov_1_3.sql

@@ -1,5 +1,3 @@
-USE srcdt;
-
 SELECT DISTINCT
 	CONCAT(YEAR(birth_dt) - YEAR(birth_dt) % 10, '-е') AS generation
 FROM