Tag: databases

Questions Related to databases

Can you use both SELECT and WHERE SQL clauses in one SQL statement?
technology databases

  1. True

  2. False

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Correct Option: A

What is the purpose of the SQL AS clause?
technology databases

  1. The AS SQL clause is used change the name of a column in the result set or to assign a name to a derived column.

  2. The AS clause is used with the JOIN clause only.

  3. The AS clause defines a search condition.

  4. The AS clause defines a group

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Correct Option: A

Which SQL statement selects all rows from table called Contest, with column ContestDate having values greater or equal to May 25, 2006?
technology databases

  1. SELECT * FROM Contest WHERE ContestDate >= '05/25/2006'

  2. SELECT * FROM Contest HAVING ContestDate >= '05/25/2006'

  3. SELECT * FROM Contest WHERE ContestDate < '05/25/2006'

  4. SELECT * FROM Contest IN ContestDate < '05/25/2006'

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Correct Option: A

Which SQL statement inserts data into a table called Projects?
technology databases

  1. INSERT INTO Projects (ProjectName, ProjectDescription) VALUES ('Content Development', 'Website content development project')

  2. INSERT Projects VALUES ('Content Development', 'Website content development project')

  3. INSERT Projects ('Content Development', 'Website content development project')

  4. SAVE INTO Projects (ProjectName, ProjectDescription) VALUES ('Content Development', 'Website content development project')

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Correct Option: A
Explanation:

To insert data into a table called Projects, the user needs to use the INSERT statement.

Now let's go through each option and explain why it is right or wrong:

A. INSERT INTO Projects (ProjectName, ProjectDescription) VALUES ('Content Development', 'Website content development project'): This option is correct. This statement inserts data into the Projects table by specifying the column names (ProjectName and ProjectDescription) and their respective values ('Content Development' and 'Website content development project').

B. INSERT Projects VALUES ('Content Development', 'Website content development project'): This option is incorrect because it does not specify the column names. The correct syntax is to use INSERT INTO, followed by the table name and then the column names and values.

C. INSERT Projects ('Content Development', 'Website content development project'): This option is incorrect because it is missing the INTO keyword. The correct syntax is to use INSERT INTO, followed by the table name and then the column names and values.

D. SAVE INTO Projects (ProjectName, ProjectDescription) VALUES ('Content Development', 'Website content development project'): This option is incorrect because there is no SAVE keyword in SQL. The correct syntax is to use INSERT INTO, followed by the table name and then the column names and values.

Therefore, the correct answer is: A. INSERT INTO Projects (ProjectName, ProjectDescription) VALUES ('Content Development', 'Website content development project')

Which of the following SQL statements will select all records with all their columns from a table called Sales.
technology databases

  1. SELECT * FROM Sales

  2. DELETE FROM Sales

  3. SELECT * FROM SALES WHERE OrderID < 1

  4. SELECT FROM Sales

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Correct Option: A

Which of the following SQL statements deletes all rows in table called SalesData?
technology databases

  1. DELETE FROM SalesData

  2. DELETE * FROM SalesData

  3. DELETE SalesData

  4. DELETE ALL SalesData

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Correct Option: A
Explanation:

To solve this question, the user needs to know the basic syntax of the SQL DELETE statement. The correct answer is:

The Answer is: A

Explanation:

A. DELETE FROM SalesData: This option is correct because it follows the correct syntax for deleting all rows from a table. The DELETE statement is used to delete existing records in a table, and the FROM keyword specifies the table from which to delete the rows. So, this statement will delete all rows from the SalesData table.

B. DELETE * FROM SalesData: This option is incorrect because it does not follow the correct syntax for the DELETE statement. The asterisk (*) is not required in the DELETE statement and may cause an error.

C. DELETE SalesData: This option is also incorrect because it does not follow the correct syntax for the DELETE statement. The table name should be preceded by the keyword FROM, which is missing in this option.

D. DELETE ALL SalesData: This option is incorrect because it also does not follow the correct syntax for the DELETE statement. The keyword ALL is not necessary and will cause an error.

What is the ABS SQL function used for?
technology databases

  1. To return the minimum value of a numeric expression.

  2. To return the absolute, positive value of a numeric expression.

  3. To return the maximum value of a numeric expression.

  4. To return the average value of a numeric expression.

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Correct Option: B

The HAVING clause can be used only with ...
technology databases

  1. INSERT clause

  2. SELECT clause

  3. DELETE clause

  4. JOIN clause

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Correct Option: B

If you join a table to itself, what kind of join are you using?
technology databases

  1. Selective Join.

  2. You can't join a table to itself.

  3. Self Join

  4. Outer Join

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Correct Option: C

Which SQL keyword is used to retrieve a maximum value?
technology databases

  1. MAX

  2. TOP

  3. MOST

  4. UPPER

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Correct Option: A
Explanation:

To retrieve a maximum value in SQL, the user needs to know the appropriate keyword that retrieves the highest value from a column. The correct option is:

The Answer is: A

Option A: MAX is the correct keyword used to retrieve the maximum value from a column. It is an aggregate function in SQL that takes the column name as input and returns the highest value in that column.

Option B: TOP is a keyword used to limit the number of rows returned from an SQL query. It does not retrieve the maximum value from a column.

Option C: MOST is not a valid SQL keyword.

Option D: UPPER is a keyword used to convert a string to uppercase in SQL. It does not retrieve the maximum value from a column.