Hive中的concat函數用于連接兩個或多個字符串列
SELECT concat(first_name, ' ', last_name) AS full_name
FROM users;
SELECT concat('Mr.', first_name) AS title
FROM users;
SELECT concat(COALESCE(first_name, ''), ' ', COALESCE(last_name, '')) AS full_name
FROM users;
總之，Hive中的concat函數可以用于連接字符串列、字符串常量和處理空值，從而在數據轉換和清洗過程中發揮重要作用。
