Скачать или смотреть SQL ORDER BY and NULLs: Understanding NULLS FIRST & LAST

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In this video I have tested 3 points mentioned in the Course for ORDER BY section.

1) Column names can be used even when a column is not present in the SELECT statement for sorting. But with column position, column must exist in SELECT.

2) NULL is treated as the biggest value by default in most of the databases during ORDER BY.

3) Be mindful of the NULL values in the ORDER BY columns. You may specify NULL to appear first or at last in the output by using NULLS FIRST or NULLS LAST in some databases.