To answer this question, you need to understand the concept of sub-queries and where they can be nested.

Sub-queries are queries that are nested within another query. They are used to retrieve data from one or more tables and can be used in various types of SQL statements.

The correct answer is B) UPDATE, DELETE, INSERT, and SELECT statements.

Explanation for each option:

A) DELETE statements only - This option is incorrect because sub-queries can be nested in other types of statements as well, not just DELETE statements.

B) UPDATE, DELETE, INSERT, and SELECT statements - This option is correct because sub-queries can be nested in UPDATE, DELETE, INSERT, and SELECT statements. They can be used to filter or retrieve data based on conditions from other tables.

C) UPDATE statements only - This option is incorrect because sub-queries can be used in other types of statements as well, not just UPDATE statements.

D) INSERT statements only - This option is incorrect because sub-queries can be used in other types of statements as well, not just INSERT statements.

Therefore, the correct answer is B) UPDATE, DELETE, INSERT, and SELECT statements.

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• Wrong explanation

To answer this question, you need to understand the syntax for the SQL INSERT statement. The correct statement to insert data into a table called Projects is:

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

Let's go through each option to understand why it is correct or incorrect:

Option A) INSERT Projects VALUES ('Content Development', 'Website content development project') - This option is incorrect because it is missing the "INTO" keyword. The correct syntax is "INSERT INTO".

Option B) SAVE INTO Projects (ProjectName, ProjectDescription) VALUES ('Content Development', 'Website content development project') - This option is incorrect because the keyword "SAVE" is not a valid keyword in SQL. The correct keyword is "INSERT INTO".

Option C) INSERT INTO Projects (ProjectName, ProjectDescription) VALUES ('Content Development', 'Website content development project') - This option is correct. It uses the correct syntax for the INSERT statement and specifies the column names (ProjectName, ProjectDescription) and their corresponding values.

Option D) INSERT Projects ('Content Development', 'Website content development project') - This option is incorrect because it is missing the "INTO" keyword. The correct syntax is "INSERT INTO".

The correct answer is C. This option is correct because it uses the correct syntax for the SQL INSERT statement and specifies the column names and their corresponding values.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) ASC - This option is correct because if you don't specify ASC or DESC after a SQL ORDER BY clause, ASC (ascending) is used by default. This means that the result will be sorted in ascending order.

Option B) DESC - This option is incorrect because if you don't specify ASC or DESC after a SQL ORDER BY clause, DESC (descending) is not used by default. ASC is used instead.

Option C) No Default value - This option is incorrect because there is a default value used if you don't specify ASC or DESC. The default value is ASC.

Option D) Returns error - This option is incorrect because not specifying ASC or DESC after a SQL ORDER BY clause does not result in an error. It will default to ASC.

The correct answer is A) ASC. This option is correct because if you don't specify ASC or DESC after a SQL ORDER BY clause, ASC (ascending) is used by default.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) SELECT FROM Sales WHERE Date BETWEEN '10/12/2005' AND '01/01/2006' - This option is incorrect because it is missing the column names to select in the SELECT clause. The correct syntax should be SELECT [column names] FROM [table name].

Option B) SELECT * FROM Sales WHERE Date BETWEEN '10/12/2005' AND '01/01/2006' - This option is correct because it selects all columns () from the "Sales" table where the "Date" column is between '10/12/2005' and '01/01/2006'. The asterisk () is a wildcard character that represents all columns in the table.

Option C) SELECT FROM Sales WHERE Date BETWEEN ('10/12/2005', '01/01/2006') - This option is incorrect because it is missing the column names to select in the SELECT clause. Additionally, the syntax for specifying a range with the BETWEEN operator is incorrect. The correct syntax is BETWEEN [lower value] AND [upper value].

Option D) All the above - This option is incorrect because only option B is the correct statement.

Therefore, the correct answer is B) SELECT * FROM Sales WHERE Date BETWEEN '10/12/2005' AND '01/01/2006'. This option is correct because it selects all columns from the "Sales" table where the "Date" column is between '10/12/2005' and '01/01/2006'.

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• Wrong explanation