To answer this question, you need to understand the basic SQL syntax and operations.

The correct answer is A) UPDATE.

Explanation for each option:

A) UPDATE - This option is correct. The UPDATE statement is used to modify or update existing data in a database table.

B) MODIFY - This option is incorrect. The MODIFY statement is not a valid SQL statement for updating data. It is typically used in conjunction with the ALTER TABLE statement to modify the structure or definition of a table.

C) SAVE - This option is incorrect. The SAVE statement is not a valid SQL statement for updating data. SQL does not have a specific statement for saving data in a database.

D) SAVE AS - This option is incorrect. The SAVE AS statement is not a valid SQL statement for updating data. SQL does not have a specific statement for saving data with a new name or as a copy.

In conclusion, the correct answer is A) UPDATE. This statement is used to modify or update existing data in a database table.

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• Wrong explanation

To answer this question, you need to understand how to retrieve only distinct values from a table using SQL queries. Let's go through each option to understand why it is correct or incorrect:

Option A) SELECT DIFFERENT - This option is incorrect because there is no SQL keyword or function called "DIFFERENT" to retrieve only different values.

Option B) SELECT UNIQUE - This option is incorrect because "UNIQUE" is not used as a keyword or function to retrieve only different values. Instead, "UNIQUE" is used to enforce uniqueness on a column or a combination of columns in a table.

Option C) SELECT DISTINCT - This option is correct because the "DISTINCT" keyword is used in SQL to retrieve only different values from a column or a combination of columns in a table. It eliminates duplicate values and returns only unique values.

Option D) SELECT EXACT - This option is incorrect because there is no SQL keyword or function called "EXACT" to retrieve only different values.

The correct answer is Option C) SELECT DISTINCT. This option is correct because the "DISTINCT" keyword is used to return only different values.

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• Wrong explanation

To delete records where the "FirstName" is "Peter" in the Persons table using SQL, you would use the DELETE statement along with the WHERE clause to specify the condition.

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

Option A) DELETE ROW FirstName='Peter' FROM Persons - This option is incorrect because the correct syntax for the DELETE statement is DELETE FROM table_name.

Option B) DELETE FROM Persons WHERE FirstName = 'Peter' - This option is correct because it follows the correct syntax for the DELETE statement. It specifies the table name as "Persons" and uses the WHERE clause to specify the condition "FirstName = 'Peter'".

Option C) DELETE FirstName='Peter' FROM Persons - This option is incorrect because the correct syntax for the DELETE statement is DELETE FROM table_name. Additionally, the condition should be specified using the WHERE clause.

Option D) REMOVE FROM Persons WHERE FirstName = 'Peter' - This option is incorrect because the correct keyword to use for deleting records in SQL is DELETE, not REMOVE. The correct syntax should be DELETE FROM table_name.

The correct answer is Option B. This option is correct because it uses the correct syntax for the DELETE statement and specifies the condition using the WHERE clause.

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• Wrong explanation

To select a column named "FirstName" from a table named "Persons" in SQL, you would use the following query:

B. SELECT FirstName FROM Persons

Option A) EXTRACT FirstName FROM Persons - This option is incorrect because the EXTRACT keyword is used to extract specific parts of a date or time, not to select columns from a table.

Option B) SELECT FirstName FROM Persons - This option is correct. It uses the SELECT keyword to specify the column "FirstName" and the FROM keyword to specify the table "Persons".

Option C) SELECT Persons.FirstName - This option is incorrect because it uses the table name "Persons" as a prefix to the column name "FirstName". In SQL, the correct syntax is to specify the column name directly after the SELECT keyword.

Option D) SELECT * FROM Persons - This option is incorrect because it uses the asterisk (*) symbol to select all columns from the table "Persons". To select only the "FirstName" column, you need to specify it explicitly as shown in option B.

The correct answer is B. This option is correct because it uses the correct syntax to select the "FirstName" column from the "Persons" table.

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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) /SQL * Plus commands cannot be abbreviated - This option is incorrect. SQL*Plus commands can be abbreviated using a combination of the first few letters of the command.

Option B) /SQL* Plus commands are accessed from a browser - This option is incorrect. SQL*Plus commands are accessed through a command-line interface, not a browser.

Option C) /SQL*Plus commands are used to manipulate data in tables - This option is correct. SQL*Plus commands are used to interact with the Oracle database, including manipulating data in tables through SQL statements.

Option D) /SQL* Plus commands manipulate table definitions in the database - This option is incorrect. SQL*Plus commands are mainly used to interact with data, not to manipulate table definitions.

Option E) /SQL* Plus is the Oracle proprietary interface for executing SQL statements - This option is correct. SQL*Plus is a command-line interface provided by Oracle for executing SQL statements and managing the Oracle database.

The correct answers are C and E. These options correctly describe attributes of SQL*Plus, as it is used to manipulate data in tables and is the Oracle proprietary interface for executing SQL statements.

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• Wrong explanation