presto substr

在Presto中，可以使用substr函数来截取字符串的子串。substr函数的语法为substr(string, start, length)，其中string表示要截取的字符串，start表示要截取的起始位置，length表示要截取的长度。例如，如果要截取字符串"hello,world,presto"的第7个字符开始的后面5个字符，可以使用以下SQL语句：SELECT substr('hello,world,presto', 7, 5)。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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