Spark SQL语法

Spark SQL是一种用于结构化数据处理的模块，它支持使用SQL语言进行数据查询和操作。下面是一些常用的Spark SQL语法：

1. 创建表

CREATE TABLE table_name (
column1 data_type,
column2 data_type,
column3 data_type,
...
)

2. 插入数据

INSERT INTO table_name VALUES (value1, value2, value3, ...)

3. 查询数据

SELECT column1, column2, column3, ...
FROM table_name
WHERE condition

4. 更新数据

UPDATE table_name
SET column = new_value
WHERE condition

5. 删除数据

DELETE FROM table_name
WHERE condition

6. 聚合函数

SELECT COUNT(column_name) FROM table_name
SELECT SUM(column_name) FROM table_name
SELECT AVG(column_name) FROM table_name
SELECT MAX(column_name) FROM table_name
SELECT MIN(column_name) FROM table_name

7. 连接查询

SELECT column1, column2, ...
FROM table1
JOIN table2
ON table1.column_name = table2.column_name

以上是一些常用的Spark SQL语法，更多语法可以参考Spark SQL官方文档。