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- 查询表中所有数据：SELECT * FROM table_name;
- 查询特定列的数据：SELECT col1, col2 FROM table_name;
- 查询满足条件的数据：SELECT * FROM table_name WHERE condition;
- 对数据进行聚合计算：SELECT SUM(col1), AVG(col2) FROM table_name GROUP BY col3;
- 对数据进行排序：SELECT * FROM table_name ORDER BY col1 DESC;
- 对数据进行分页查询：SELECT * FROM table_name LIMIT 10 OFFSET 20;
- 对数据进行联合查询：SELECT * FROM table1 JOIN table2 ON table1.id = table2.id;
- 对数据进行去重操作：SELECT DISTINCT col1, col2 FROM table_name;
- 对数据进行条件判断：SELECT col1, CASE WHEN col2 > 100 THEN ‘A’ ELSE ‘B’ END FROM table_name;
- 对数据进行时间窗口查询：SELECT * FROM table_name WHERE timestamp BETWEEN start_time AND end_time;
