Question

|| is String concatenation SELECT 'Hello, ' || 'world!' Result: Hello, world! SELECT first_name || ' ' || last_name AS name FROM Student

Option 1: CONCAT
Option 2: JOIN
Option 3: MERGE
Option 4: APPEND

Answer 1

The question is about string concatenation in SQL, where the '||' operator is used to merge strings. Option 1: CONCAT is the correct SQL function for this operation, as it is designed for string concatenation.

Step-by-step explanation:

The question pertains to string concatenation in SQL. In SQL, the '||' operator is commonly used to concatenate two or more strings. For example, the expression 'Hello, ' || 'world!' combines the two strings into a single string: 'Hello, world!'. Similarly, combining first_name and last_name fields from a database table might use the same operator to create a full name.

Looking at the options provided,

• Option 1: CONCAT is a function in SQL used for string concatenation.
• Option 2: JOIN refers to combining rows from two or more tables.
• Option 3: MERGE is used to combine data from multiple tables into one.
• Option 4: APPEND is not a standard SQL operation but implies adding to the end of something.

Therefore, Option 1: CONCAT is the correct answer, as it is the function specifically designed for string concatenation in SQL.