COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Where we write (, )?
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between the databases names.
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between the column names.
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Step-1: Follow this path: Databases > Tables > Columns. Step-2: Choose the column name you want to change and then double-click. Step-3: Give a name to your selected column. Step-4: Refresh the table or database to complete the renaming steps.
Detailed explanation-2: -Select * is asking to pull everything from the table i.e. high I/O whereas in Select with column name is just asking to pull what you need. This will have low I/O compared to Select * if you are not pulling all the columns.
Detailed explanation-3: -For example, if you want to select the column with special character ‘#’, the code should like this: var rows = dt. Select("", "[#]");
There is 1 question to complete.