Oracle 取字段最后4位：使用 SUBSTR 函数提取字符串

{"title":"Oracle 取字段最后4位：使用 SUBSTR 函数提取字符串","description":"学习如何使用 Oracle 的 SUBSTR 函数提取字段的最后4个字符。本文提供了一个示例查询，并解释了如何使用该函数以及如何自定义查询以满足您的需求。","keywords":"Oracle, SUBSTR, 字段, 最后4位, 字符串, 提取, 查询, 示例, 数据库, SQL","content":"To extract the last 4 characters of a field in Oracle, you can use the SUBSTR function in combination with the LENGTH function. Here's an example query:\n\n\nSELECT SUBSTR(column_name, -4) AS last_four_chars\nFROM table_name;\n\n\nReplace column_name with the actual name of the column you want to extract the last 4 characters from, and table_name with the actual name of the table.\n\nThe SUBSTR(column_name, -4) expression extracts the substring starting from the 4th character from the end of the string. The AS last_four_chars part is optional and is used to assign a name to the extracted substring in the result set."}