sql server分组查询
时间: 2023-09-10 18:11:17 浏览: 56
SQL Server分组查询是通过使用GROUP BY语句将数据按照某种值进行分组的一种查询方式。具体来说,分组查询是指将数据表中的数据按照指定规则进行分组,并针对每个分组进行数据处理。在分组查询中,需要使用GROUP BY子句指定分组的规则,该子句将根据指定的列或列组合将数据集划分为多个小区域。通过结合聚合函数,可以对每个分组进行计算并返回单个值。在GROUP BY子句中,需要引用与查询中要返回的列相对应的列。例如,如果查询涉及到sno和score两列,那么在GROUP BY子句中就需要引用sno和score。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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