-- Создаем таблицу tranches
CREATE TABLE data_for_task (
  Credit_id text NOT NULL,
  Date_balance date NOT NULL,
  fact_credit_size_rur numeric NOT NULL,
  product_line_name text NOT NULL,
  FTP numeric NOT NULL
);

Разница между макс и мин рентабельностью:
-- добавляем значения в таблицу tranches
INSERT INTO data_for_task VALUES ('26600540585','2016-01-25',8912800,'Готовое жилье',0.0645);
INSERT INTO data_for_task VALUES ('26601862121','2016-06-26',8431000,'Строящееся жилье',0.0631);
INSERT INTO data_for_task VALUES ('26604531233','2017-02-27',18100000,'Строящееся жилье',0.059);
INSERT INTO data_for_task VALUES ('26605067941','2016-06-28',12100000,'Потребительский кредит',0.0595);
INSERT INTO data_for_task VALUES ('26626394021','2017-04-29',8596000,'Потребительский кредит',0.0604);
INSERT INTO data_for_task VALUES ('26629103523','2017-01-30',108100000,'Потребительский кредит',0.0594);
INSERT INTO data_for_task VALUES ('26703177383','2017-06-25',26867800,'Потребительский кредит',0.0593);

--CREATE TEMP TABLE data_for_task_3 AS


CREATE TABLE pivot_table AS
SELECT *
FROM crosstab(
  'SELECT 
    product_line_name,
    EXTRACT(month FROM Date_balance) AS Month,
    SUM(fact_credit_size_rur) AS SUMs
  FROM 
    data_for_task
  WHERE 
    EXTRACT(quarter FROM Date_balance)=1 AND EXTRACT(YEAR FROM Date_balance)=2017
  GROUP BY 
    product_line_name, Month
  ORDER BY 1,2',
  'VALUES (1),(2),(3)'
  ) AS ct(product_line_name text,"JAN" numeric, "FEB" numeric, "MAR" numeric);

--SELECT 
--  t1.product_line_name,
--  AVG(t1.FTP)
--FROM
--  data_for_task t1
--JOIN 
--  data_for_task_2 t2 ON t1.product_line_name=t2.product_line_name
--WHERE 
 -- DATE_TRUNC('month',Date_balance)='2017-06-01'
--GROUP BY 
  --t1.product_line_name
  
CREATE TABLE pivot_table AS
SELECT *
FROM crosstab(
  'SELECT 
    product_line_name,
    EXTRACT(month FROM Date_balance) AS Month,
    SUM(fact_credit_size_rur) AS SUMs
  FROM 
    data_for_task
  WHERE 
    EXTRACT(quarter FROM Date_balance)=1 AND EXTRACT(YEAR FROM Date_balance)=2017
  GROUP BY 
    product_line_name, Month
  ORDER BY 1,2',
  'VALUES (1),(2),(3)'
  ) AS ct(product_line_name text,"JAN" numeric, "FEB" numeric, "MAR" numeric);
by

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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;