dove2199 2018-07-01 11:02
浏览 108
已采纳

从Mysql中的一列中删除子字符串

I want to delete a part of the substring from my table's column

For example, I have a structure like the following:

id | Col1                                      
____________________________________________________________
1  | The string I want and the string I don't   

And I need to update my table such that:

id | Col1                                       
____________________________________________________________
1  | The string I want 

I tried using the following code:

$var = "UPDATE mytable
  SET col1 = replace(col1,col1(SUBSTRING(col1,19),'')";

But this won't work!

  • 写回答

1条回答 默认 最新

  • duan205571 2018-07-01 11:14
    关注

    Try this query to separate address:

    UPDATE mytable as a 
    INNER JOIN
        (SELECT 
            id,
            Address1, 
            LEFT(Address1, 40 -1) as newCol1,
            substring(Address1, 40) as newCol2
        FROM mytable 
        where length(Address1) > 40) b 
    on a.id=b.id 
    set Address1=newCol1,Address2=newCol2;
    

    if there is any concern about above query please let me know.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥15 file converter 转换格式失败 报错 Error marking filters as finished,如何解决?
  • ¥15 ubuntu系统下挂载磁盘上执行./提示权限不够
  • ¥15 Arcgis相交分析无法绘制一个或多个图形
  • ¥15 关于#r语言#的问题:差异分析前数据准备,报错Error in data[, sampleName1] : subscript out of bounds请问怎么解决呀以下是全部代码:
  • ¥15 seatunnel-web使用SQL组件时候后台报错,无法找到表格
  • ¥15 fpga自动售货机数码管(相关搜索:数字时钟)
  • ¥15 用前端向数据库插入数据,通过debug发现数据能走到后端,但是放行之后就会提示错误
  • ¥30 3天&7天&&15天&销量如何统计同一行
  • ¥30 帮我写一段可以读取LD2450数据并计算距离的Arduino代码
  • ¥15 飞机曲面部件如机翼,壁板等具体的孔位模型