Merge pull request #130 from yadavan88/date-interval

Added queries for interval retrieval

Author: milos-simic

sql-queries-dates/interval-queries/interval-mssql.sql

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+SELECT id, name, enrollment_date FROM Student WHERE enrollment_date >= DATEADD(DAY, -10, CONVERT(date, GETDATE()));
+SELECT * FROM Registration WHERE reg_datetime >= DATEADD(DAY, -10, GETDATE());
+SELECT * FROM Registration WHERE DATEDIFF(DAY, reg_datetime, GETDATE()) <= 10;

sql-queries-dates/interval-queries/interval-mysql.sql

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+SELECT id, name, enrollment_date FROM Student WHERE enrollment_date >= DATE_SUB(CURRENT_DATE, INTERVAL 10 DAY);
+SELECT * FROM Registration WHERE reg_datetime >= DATE_SUB(NOW(), INTERVAL 10 DAY);

sql-queries-dates/interval-queries/interval-pg.sql

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+SELECT id, name, enrollment_date FROM Student WHERE enrollment_date >= CURRENT_DATE - INTERVAL '10 days';
+SELECT * FROM Registration WHERE reg_datetime >= CURRENT_TIMESTAMP - INTERVAL '10 days';