I am new to Database systems and I don't really have the best lecturer and we are learning about Relational algebra and relational calculus, not many videos or help online.
Please can someone assist me with this topic as i would like to get further knowledge
...Trying to SUM and JOIN 2 columns with different tables but it duplicates results, here is my query
...Hello, I am using nvarchar column to store datetime as string, but I would like to convert this column from nvarchar into datetime in sql server. How can I do it.
Current time format is '2019-01-29 14:55:50'
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