debit_card_specializing Database Schema

SQL Query:

SELECT T1.Segment FROM customers AS T1 INNER JOIN yearmonth AS T2 ON T1.CustomerID = T2.CustomerID WHERE T2.Date = '201309' GROUP BY T1.CustomerID ORDER BY SUM(T2.Consumption) ASC LIMIT 1

Evidence:

September 2013 refers to yearmonth.date = '201309'

SQL Query:

SELECT T1.Segment FROM customers AS T1 INNER JOIN yearmonth AS T2 ON T1.CustomerID = T2.CustomerID GROUP BY T1.Segment ORDER BY SUM(T2.Consumption) ASC LIMIT 1

SQL Query:

SELECT COUNT(T1.TransactionID) FROM transactions_1k AS T1 INNER JOIN gasstations AS T2 ON T1.GasStationID = T2.GasStationID WHERE T1.Date = '2012-08-26' AND T1.Time BETWEEN '08:00:00' AND '09:00:00' AND T2.Country = 'CZE'

Evidence:

Czech Republic can be represented as the Country value in the gasstations table is 'CZE'; '2012/8/26' can be represented by '2012-08-26'; during 8:00-9:00 can be represented as Time BETWEEN '08:00:00' AND '09:00:00'

SQL Query:

SELECT T2.Segment FROM transactions_1k AS T1 INNER JOIN customers AS T2 ON T1.CustomerID = T2.CustomerID ORDER BY Date ASC LIMIT 1

SQL Query:

SELECT DISTINCT T3.ChainID FROM transactions_1k AS T1 INNER JOIN customers AS T2 ON T1.CustomerID = T2.CustomerID INNER JOIN gasstations AS T3 ON T1.GasStationID = T3.GasStationID WHERE T2.Currency = 'EUR'