Azure Synapse Analytics语法

Azure Synapse Analytics是一种云数据仓库服务，它提供了一种基于SQL的查询语言，称为Synapse SQL，可以用于处理和分析数据。下面是一些常用的Synapse SQL语法：

1. 创建表：

CREATE TABLE table_name (
  column1 datatype [ NULL | NOT NULL ],
  column2 datatype [ NULL | NOT NULL ],
  ...
);

2. 插入数据：

INSERT INTO table_name (column1, column2, column3, ...)
VALUES (value1, value2, value3, ...);

3. 更新数据：

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

4. 删除数据：

DELETE FROM table_name
WHERE condition;

5. 查询数据：

SELECT column1, column2, ...
FROM table_name
WHERE condition
ORDER BY column1 ASC/DESC;

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. 连接表：

SELECT column_name(s)
FROM table1
JOIN table2
ON table1.column_name = table2.column_name;

8. 子查询：

SELECT column_name(s)
FROM table_name
WHERE column_name IN (SELECT column_name FROM table_name WHERE condition);

以上是几个常用的Synapse SQL语法，更多详细的语法请参考官方文档。