sqlserver中isnull

在SQL Server中，ISNULL函数用于处理字段的空值。ISNULL函数接受两个参数，第一个参数是要判断的字段名，第二个参数是指定的替代值。如果字段的值为空，则会返回替代值，否则返回字段的实际值。例如，可以使用以下语句来处理字段的空值：SELECT ISNULL(字段名, 替代值) FROM 表名 WHERE 条件。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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