Question

如果我的列包含这些值

"Added by Manu on 31-12-2013 & 12thFeb2014"
"Added by Manu on 01-01-2014 [nx-RP-S]"
"Added by Manu on 8thApril2014 (Pnxs)"
added by Manu on 7thFeb2014 [np1PUNCTnp2]

然后我想要一个只删除此字符串的查询

"Added by Manu on 31-12-2013 & 12thFeb2014"`
"Added by Manu on 01-01-2014 ""
"Added by Manu on 8thApril2014"
"added by Manu on 7thFeb2014 " rest [nx-RP-S],(Pnxs),[np1PUNCTnp2]

分别将在列中。

示例如果原始值为"Added by Manu on 01-01-2014 [nx-RP-S]"，那么我只想从列中删除"Added by Manu on 01-01-2014"，如果原始值为"Added by Manu on 31-12-2013 & 01-01-2014"，则将其设为null

提前致谢。

Answer 1

这将从[

]中删除该部分

 select SUBSTRING_INDEX(your_column, '[', 1) as removedPart from table1

编辑：为了你纠正的要求试试这个：

 select CASE WHEN your_column NOT Like '%[%' then 'NULL'

 else SUBSTRING_INDEX(your_column, ' ', -1)  end as modified from table1

Demo

EDIT2：

更新规则使用此：

  Update table1 
  set your_column = 
  CASE WHEN your_column NOT Like '%[%' then 'NULL'
  else SUBSTRING_INDEX(your_column, ' ', -1)  end

DEMO

从表中删除特定字符串值

1 个答案: