BD-exp-3/sql.md at 2912a4f86a957a6d10db7b465724cf233afabec0

fly6516 2912a4f86a docs(BD-exp-3): 添加项目文档和示例代码

- 新增 App.java 和 AppTest.java 文件作为项目示例
- 添加 command.md、origin.md 和 sql.md 文件，包含项目相关命令和 SQL 语句
- 创建 pom.xml 文件定义项目依赖

2025-03-16 19:01:24 +08:00

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DROP TABLE IF EXISTS ratings; DROP TABLE IF EXISTS movies; DROP TABLE IF EXISTS users;

CREATE EXTERNAL TABLE users ( UserID BIGINT, Gender STRING, Age INT, Occupation STRING, Zipcode STRING ) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' STORED AS TEXTFILE LOCATION '/user/hadoop/movie_data/users';

CREATE EXTERNAL TABLE movies ( MovieID BIGINT, Title STRING, Genres STRING ) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' STORED AS TEXTFILE LOCATION '/user/hadoop/movie_data/movies';

CREATE EXTERNAL TABLE ratings ( UserID BIGINT, MovieID BIGINT, Rating DOUBLE, Timestamped STRING ) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' STORED AS TEXTFILE LOCATION '/user/hadoop/movie_data/ratings';

SELECT * FROM users LIMIT 5; SELECT * FROM movies LIMIT 5; SELECT * FROM ratings LIMIT 5;

788 B Raw Blame History

788 B

Raw Blame History