charindex instruction
CHARINDEX返回字符串中指定表达式的起始位置。语法CHARINDEX(expression1,expression2[,start_location])参数expression1一个表达式,其中包含要寻找的字符的次序。expression1是一个短字符数据类型分类的表达式。expression2一个表达式,通常是一个用于搜索指定序列的列。expression2属于字符串数据类型分类。start_location在expression2中搜索expression1时的起始字符位置。如果没有给定start_location,而是一个负数或零,则将从expression2的起始位置开始
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