52. An analyst wants to identify rows with states having a three-character abbreviation instead of standard two characters as part of data cleansing. Which Structured Query Language (SQL) statement will perform this function?
Answer: B
LENGTH statement will perform the function of identifying rows with states having a three-character abbreviation.
The LENGTH statement in SQL provides the ability to check the number of characters in a string, making it suitable for identifying state abbreviations that are three characters long instead of the standard two.
A) WHERE statement
While the WHERE statement is essential for filtering records in SQL, it does not inherently measure the length of strings. Therefore, it cannot directly identify rows based on the character count of state abbreviations, making it an incorrect choice in this context.
B) LENGTH statement
The LENGTH statement is specifically designed to return the number of characters in a given string. By using this statement, an analyst can easily filter rows where the length of the state abbreviation is three, thus fulfilling the requirement of identifying the incorrect format.
C) DISTINCT statement
The DISTINCT statement is utilized to return unique values from a specified column. It does not assess or filter based on the length of strings, hence it is not applicable for identifying state abbreviations based on their character count.
D) TRIM statement
The TRIM statement is used to remove leading and trailing spaces from a string. While it can assist in cleaning data, it does not provide any functionality for measuring or filtering by the length of state abbreviations, making it an irrelevant option for this question.
Conclusion
The LENGTH statement is the most appropriate choice for identifying rows with three-character state abbreviations, as it directly measures string length. All other options fail to provide this specific functionality, either serving different purposes in SQL or lacking the capability to perform length-based filtering.