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Know in (1) refers to the clause that comes right before it, so there's no pronoun necessary -- it's essentially a transform of I know it's your job. In (2), however, the object of know is not indicated, as you point out, so something must be provided.
In SQL, anything you evaluate / compute with NULL results into UNKNOWN This is why SELECT * FROM MyTable WHERE MyColumn != NULL or SELECT * FROM MyTable WHERE MyColumn <> NULL gives you 0 results.
Microsoft SQL Server is one of the exceptions: it doesn't support , and requires .
Microsoft SQL Server's relational engine has offered new instrumentation that improves by light years with each new release. The introduction of Dynamic Management Views (DMVs) in SQL Server 2005 ...
MUST News Pre-University English Role-Play Competition Successfully Held by Department of General Education 2026/04/24 Researchers from Macau University of Science and Technology and National Space Science Center reveal the lunar limb compression caused by the core-induced magnetic field. 2026/04/24
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Macau University Of Science And Technology - Admissions - MUST at a Glance
University Introduction Founded in 2000, the Macau University of Science and Technology (MUST) has rapidly developed into a multi-disciplinary university with the highest student enrollment in Macao. MUST endeavors to educate students specialized in various fields, attaches equal importance to teaching and research, focuses on the quality of programs, pursues excellence, and continuously ...