SQL ( How do I use the CONCAT function) [closed] - sql

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How do I use the CONCAT function on SQL.

That is pretty straightforward
SELECT CONCAT('hey', 'ho');

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NULL in SQL need it Removed [closed]

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I would like to remove the "Null" in my week Column. Any help? I tried screenshots provided
error
what i tried
I think you could try:
delete from [BKC_Menu_Analysis].[dbo].[FBBKCCompsWeekly] where week is NULL

what is difference between '%[^0-9.-]%' and '%[^0-9]%' in regular expression [closed]

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Can someone please explain for what reason we use .- in the regular expression and what is difference between '%[^0-9.-]%' and '%[^0-9]%'
%[^0-9.-]% will include period '.' and dash '-' characters, while %[^0-9]% will not

Google OR example for column generation [closed]

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Are there any examples of the code for the Column generation problem (cutting stock problem or any other problem) using google OR tools in C++?
Yes, as the name suggests, this does the job:
https://github.com/google/or-tools/blob/stable/examples/cpp/strawberry_fields_with_column_generation.cc

Is it slower to select from another database [closed]

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If I am standing in database A and what to select from database B by using:
B.table.column
Is this going to slow things down compared to if the table was in databse A where I am standing?

Binary search works best with which data structure? [closed]

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Binary search works best with which data structure?
One that is sorted and allows random access.