mysql中distinctrow
时间: 2023-10-19 08:29:56 浏览: 45
在MySQL中,distinct和distinctrow是相同的,它们都用于从查询结果中去除重复的记录。默认情况下,distinct和distinctrow都使用全部的列来进行去重。然而,在使用distinct或distinctrow时,只能选择其中一个,不能同时使用多个。
在某些情况下,当使用distinct或distinctrow时,可能会出现语法错误。例如,在执行类似于"select distinct province from person"的语句时,可能会出现错误信息"[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DISTINCT province from person' at line 1"。这通常是由于语法不正确所导致的,需要根据MySQL版本和使用情况进行相应的调整。
需要注意的是,distinct只能在select语句中使用,用于去除查询结果中的重复记录。具体的语法是:select distinct expression[,expression...] from tables [where conditions]; 这里的expression是指要选择的列或表达式,tables是要查询的表,conditions是查询条件。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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