To answer this question, you need to have knowledge of the types of loops in PL/SQL. Let's go through each option to understand why it is correct or incorrect:

Option A) 1 - This option is incorrect because there are more than one type of loop in PL/SQL. Option B) 3 - This option is correct because there are indeed three types of loops in PL/SQL. Option C) 2 - This option is incorrect because there are more than two types of loops in PL/SQL. Option D) 4 - This option is incorrect because there are not four types of loops in PL/SQL.

The correct answer is B. There are three types of loops in PL/SQL, which are:

1. FOR loop: This loop is used to iterate over a specific range of values or a collection.
2. WHILE loop: This loop is used to repeatedly execute a set of statements as long as a certain condition is true.
3. LOOP-EXIT loop: This loop is used to perform an infinite loop until an exit condition is met using the EXIT statement.

Therefore, the correct answer is B) 3.

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• Wrong explanation

To answer this question, you need to understand SQL commands for manipulating data in a database table.

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

Option A) DELETE - This option is correct because the DELETE command is used to remove one or more rows of data from a table in a SQL database.

Option B) UNION - This option is incorrect because the UNION command is used to combine the result sets of two or more SELECT statements.

Option C) SELECT - This option is incorrect because the SELECT command is used to retrieve data from a database table, not delete it.

Option D) INSERT - This option is incorrect because the INSERT command is used to add new rows of data into a table, not delete existing data.

The correct answer is A) DELETE. This option is correct because the DELETE command is specifically designed to delete data from a SQL database table.

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• Wrong explanation