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Articles tagged with #sql
Question and Answer: Key Points: What the Query Does Retrieves unique CITY names where the station ID is even Key Conditions Used ID % 2 = 0 ensures only even IDs are included DISTINCT CITY removes duplicate city names Why It Works Meets both...
Question and Answer: Key Points: What the Query Does Retrieves the CITY and STATE fields for every row in the STATION table Key SELECT Fields Only CITY and STATE are requested (not other columns) Why It Works No WHERE condition → returns all st...
Question and Answer: Key Points: What the Query Does Selects the NAME of every city located in Japan Key Condition COUNTRYCODE = 'JPN' filters rows to only Japanese cities Why It Works Only the NAME column is returned, exactly as the problem as...
Question and Answer: Key Points: What the Query Does Retrieves all columns for every city located in Japan Key Conditions Used COUNTRYCODE = 'JPN' filters only Japanese cities Why It Works SELECT * returns the complete details of each matching ...
Question and Answer: Key Points: What the Query Does Fetches all columns for the city with ID = 1661 Key Conditions Used WHERE ID = 1661 ensures we only retrieve the specific city requested Why It Works SELECT * returns all available fields (ID...
Problem: https://www.hackerrank.com/challenges/revising-the-select-query-2 Question: Code: SELECT NAME FROM CITY WHERE COUNTRYCODE='USA' AND POPULATION>120000 Key Points: What the Query Does Retrieves the names of U.S. cities Only cities...