sql server分组语句

SQL Server中的分组语句是使用GROUP BY子句来实现的。GROUP BY子句通常与聚合函数一起使用，用于根据一个或多个列对结果集进行分组，并对每个组进行计算。例如，下面是一个示例的SQL语句：

SELECT vend_id, COUNT(*) AS num_prods
FROM Products
GROUP BY vend_id;

这个语句将根据vend_id字段对Products表进行分组，并使用COUNT(*)函数计算每个组中的记录数。结果将返回每个vend_id及其对应的记录数。\[1\]

需要注意的是，GROUP BY子句必须在WHERE子句之后使用，而HAVING子句可以在GROUP BY子句之后使用，用于过滤分组后的结果。\[2\]\[3\]
#### 引用[.reference_title]
- *1* [SQL SERVER 入门进阶教程——数据分组(GROUP BY和HAVING)](https://blog.csdn.net/zefllj/article/details/97523550)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down1,239^v3^insert_chatgpt"}} ] [.reference_item]
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