Which function returns the position of a substring within a string?

Which function returns the position of a substring within a string?

• A. Replace
• B. Length
• C. Substring
• D. Position

Answer: (D)

Finding where a smaller string appears inside a larger one is what the position function is designed for. It returns the starting index of the first occurrence of the specified substring within the string, typically using 1-based numbering. For example, position('ba' in 'abba') gives 2, since 'ba' starts at the second character. This is different from the other options: Replace changes the text by substituting something else, Length reports how many characters are in the string, and Substring extracts a portion of the string. So when you need to know where a substring begins, you use the position function. (Note: behavior when the substring isn’t found can vary by database system, sometimes returning 0 or NULL.)

Finding where a smaller string appears inside a larger one is what the position function is designed for. It returns the starting index of the first occurrence of the specified substring within the string, typically using 1-based numbering. For example, position('ba' in 'abba') gives 2, since 'ba' starts at the second character. This is different from the other options: Replace changes the text by substituting something else, Length reports how many characters are in the string, and Substring extracts a portion of the string. So when you need to know where a substring begins, you use the position function. (Note: behavior when the substring isn’t found can vary by database system, sometimes returning 0 or NULL.)