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Starting with Oracle9i, the confusing outer join syntax using the ‘(+)’ notation has been superseded by ISO 99 outer join syntax. As we know, there are three types of outer joins, left, right, and full outer join. The purpose of an outer join is to include non-matching rows, and the outer join returns these missing columns as NULL values. Let’s review the syntax differences between these variations in join syntax: Left outer join: Oracle8i select last_name, department_name from employees e, departments d where e.department_id = d.department_id(+); Left outer join: Oracle9i select last_name, department_name from employees e left outer join departments d on e.department_id = d.department_id;
Here are some full examples: ExpressionMeaning0 0 12 * * ?Fire at 12pm (noon) every day0 15 10 ? * *Fire at 10:15am every day0 15 10 * * ?Fire at 10:15am every day0 15 10 * * ? *Fire at 10:15am every day0 15 10 * * ? 2005Fire at 10:15am every day during the year 20050 * 14 * * ?Fire every minute starting at 2pm and ending at 2:59pm, every day0 0/5 14 * * ?Fire every 5 minutes starting at 2pm and ending at 2:55pm, every day0 0/5 14,18 * * ?Fire every 5 minutes starting at 2pm and ending at 2:55pm, AND fire every 5 minutes starting at 6pm and ending at 6:55pm, every day0 0-5 14 * * ?Fire every minute starting at 2pm and ending at 2:05pm, every day0 10,44 14 ? 3 WEDFire at 2:10pm and at 2:44pm every Wednesday in the month of March.0