oracle中截取字符串

在Oracle中，你可以使用SUBSTR函数来截取字符串。SUBSTR函数的语法是：
SUBSTR(string, a, b)
其中，string是需要截取的字符串，a是截取字符串的开始位置，b是要截取的字符串的长度。如果a等于0或1，那么就从第一个字符开始截取。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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