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  • lpad&rpad

    lpad( string, padded_length, [ pad_string ] )

    string:
    准备被填充的字符串
    padded_length:
    填充之后的字符串长度
    pad_string:
    填充字符串,是个可选參数

    RPAD:从右边開始填充,使用方法同LPAD。

    1、LPAD函数:oracle数据库函数,是从左边起对指定的字符串进行指定的字符填充。

    实例一:SQL> select lpad('xxvvv',4)||'AAA'||'BBB' from dual;

                 LPAD('XXVVV',4)||'AAA'||'BBB'
                 -----------------------------
                 xxvvAAABBB
           SQL> select lpad('xxv',4)||'AAA'||'BBB' from dual;

                LPAD('XXV',4)||'AAA'||'BBB'
                ---------------------------
                xxvAAABBB
           从左边開始对字符串'AAA'||'BBB'进行填充,填充长度为4(‘xxvvv’是填充字符串,4是填充字符串的长度,若填充字符串长度超过4,则截取前4位填充,若不超过4,则所有填充)
         
    实例二:SQL> select lpad('aaabbb',10,'x') from dual;

            LPAD('AAABBB',10,'X')
            ---------------------
            xxxxaaabbb
         从左边開始对字符串'AAABBB'进行填充(‘aaabbb’:被填充字符串。10:填充后字符串长度,‘x’:填充字符串。填充后的字符串长度为10)

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  • 原文地址:https://www.cnblogs.com/gcczhongduan/p/5206331.html
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