Coalesce operators allow you to check for nulls and return a default value when one is found—and do it in a single line of code. In Visual Basic, the coalesce operator is If (), in C#, it’s ??. This ...

between inner and outer JOINs, and then the implications of NULLs on our queries. In order to examine the difference between inner and outer JOINs, we’ll need some sample data.

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when NULLs appear in the data of a subquery. Scott Stephens worked for Oracle for more than 13 years in technical support, e-commerce, marketing, and software development.

As such, without nulls, missing information must be stored as a valid date/time. So, if a date/time column can be unknown, it should be defined to be nullable because null is the only viable option ...

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