mysql - Delete Composite unique key [ applied on 3 fields combinely ] -

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In MySQL, I have created a unique composite key based on 3 columns.

How can I remove this unique key barrier without removing the entire table?

I got an answer and it worked 

  show index table_name   
 Then check the "key_name" barrier that you want to leave.  
 This will be "key_name" for the combined parenthesis in the form of " arbitrary_index_name ".  
 then use this DROP query  
  drop indexes arbitrary_index_name on table_name

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