-- create
create table clnt_aggr (
    client_dk   integer,
    tb_name Varchar (100),
    salary  integer,
    pos_amt integer,
    pos_qty integer,
    report_dt   date,
    primary key(client_dk, tb_name, report_dt)
);
-- insert
INSERT INTO clnt_aggr VALUES 
  (507851886, 'Московский банк',	15000,	6400,	8,	'2019-05-31'),
  (267188214, 'Центрально-Черноземный банк',	40000,	13200,	10,	'2019-06-30'),
  (148849526, 'Центрально-Черноземный банк',	40000,	35000,	3,	'2019-05-31'),
  (148849526, 'Московский банк',	30000,	35000,	3,	'2019-06-30'),
  (148849526, 'Московский банк',	31000,	35000,	3,	'2019-07-30'),
  (148849526, 'Московский банк',	32000,	35000,	3,	'2019-08-30'),
  (148849526, 'Московский банк',	33000,	35000,	3,	'2019-09-30'),
  (148849526, 'Московский банк',	55000,	35000,	3,	'2019-10-30'),
  (507851886, 'Московский банк',	12000,	6400,	8,	'2019-06-30'),
  (507851886, 'Московский банк',	50000,	6400,	8,	'2019-08-30'),
  (507851886, 'Московский банк',	35000,	6400,	8,	'2019-09-30'),
  (507851886, 'Московский банк',	55000,	6400,	8,	'2019-10-30'),
  (613898474, 'Юго-Западный банк',	150000,	61000,	26,	'2019-06-30');
-- fetch 
--SELECT * FROM clnt_aggr;

-- create
create table clnt_data (
client_dk	integer,
actual_from_dt	date,
actual_to_dt	date,
gender	Varchar(1),
age	integer,
сhild_qty	integer,
CONSTRAINT code_title PRIMARY KEY(client_dk, actual_from_dt)
);
-- insert
INSERT INTO clnt_data VALUES 
  (507851886,	'2019-03-05',	'2019-07-20',	'M',	25,	1),
  (507851886,	'2019-07-21',	'2099-12-31',	'M',	25,	2),
  (267188214,	'2019-02-01',	'2099-12-31',	'M',	46,	3),
  (148849526,	'2018-09-15',	'2099-12-31',	'W',	18,	0),
  (613898474,	'2018-05-11',	'2099-12-31',	'M',	73,	2);

-- task 2: 
-- Определяю самую актуальную дату, как дату последнего репорта в тер.банке
-- условие трактую так: отобрать записи с последними report_dt, среди них найти макс. зп/возраст для каждого тб
-- как сделал
-- с исп. подзапроса оставляю только строки на самую актуальную дату для каждого тб
-- вывожу самую высокую зп/возраст. Если несколько возрастов получили одинаковую макс.зп, то выведу самого младшего
select
  tb_name, 
  age,
  salary
from 
(
select
  a.report_dt,
  a.tb_name,
  b.age,
  a.salary,
  max(a.report_dt) over (partition by a.tb_name) as max_report_dt,
  max(a.salary) over (partition by a.tb_name, report_dt) as max_salary_by_report_dt
FROM
  clnt_aggr a
inner join
  clnt_data b on  
  a.client_dk = b.client_dk
  and a.report_dt between b.actual_from_dt and b.actual_to_dt
order by a.tb_name, a.client_dk, a.salary desc, a.report_dt desc
  ) a
where 
  report_dt = max_report_dt
  and salary = max_salary_by_report_dt

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About PostgreSQL

PostgreSQL is a open source relational database system and is also knows as Postgres.

Key Features:

  • Postgres is not only free and open-source but also it is highly extensible.
  • Custom Data types and funtions from various programming languaues can be introduced and the good part is compiling entire database is not required.
  • ACID(Atomicity, Consistency, Isolation, Durability) compliant.
  • First DBMS which implemented Multi-version concurrency control (MVCC) feature.
  • It's the default database server for MacOS.
  • It supports all major operating systems like Linux, Windows, OpenBSD,FreeBSD etc.

Syntax help

1. CREATE

CREATE command is used to create a table, schema or an index.

Syntax:

         CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

2. ALTER

ALTER command is used to add, modify or delete columns or constraints from the database table.

Syntax

ALTER TABLE Table_name ADD column_name datatype;

3. TRUNCATE:

TRUNCATE command is used to delete the data present in the table but this will not delete the table.

Syntax

TRUNCATE table table_name;

4. DROP

DROP command is used to delete the table along with its data.

Syntax

DROP TABLE table_name;

5. RENAME

RENAME command is used to rename the table name.

Syntax

ALTER TABLE table_name1 RENAME to new_table_name1;

6. INSERT

INSERT Statement is used to insert new records into the database table.

Syntax

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

7. SELECT

Select statement is used to select data from database tables.

Syntax:

SELECT column1, column2, ...
FROM table_name;

8. UPDATE

UPDATE statement is used to modify the existing values of records present in the database table.

Syntax

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

9. DELETE

DELETE statement is used to delete the existing records present in the database table.

Syntax

DELETE FROM table_name where condition;