Exam AWS Certified Data Engineer - Associate DEA-C01 topic 1 question 95 discussion

Regex Patterns for everyone's reference . : Matches any single character. * : Matches zero or more of the preceding element. + : Matches one or more of the preceding element. [abc] : Matches any of the enclosed characters. [^abc] : Matches any character not enclosed. ^ : Matches the start of a string. $ : Matches the end of a string. | : Logical OR operator. (abc) : Matches 'abc' and remembers the match. Answer is B

Regex patterns: ^ - used to capture the start of the text/string | - used as an OR operator

B. Select * from Sales where city_name ~ ‘^(San|El)*’; This query uses a regular expression pattern with the ~ operator. The caret ^ at the beginning of the pattern indicates that the match must start at the beginning of the string. (San|El) matches either “San” or “El”, and * means zero or more of the preceding element. So this query will return all rows where city_name starts with either “San” or “El”.

B - becuase of regexp

^ asserts the position at the start of the string. (San|El) matches either "San" or "El".

~: This operator indicates the use of a regular expression. ^: This symbol signifies the start of the string. (San|El): This pattern matches strings that start with either "San" or "El".