MySQL error code: 1175 during UPDATE in MySQL Workbench -


I'm trying to update this column visited , give it 1 value. I am writing a statement in MySQL workspace, and in SQL Editor from inside the workbook. I am writing the following command: 

  UPDATE tablename SET column name = 1;   
 This gives me the following error:  
 
 You are using Safe Update mode and you tried to update without a table that was Uses a key column, disable safe mode, toggle options ....   
 I have followed the instructions, and I have chosen the  safe update  option Delete from  edit  menu then  Preferences  then  SQL Editor  In and click. The same error still appears; I am not able to update this value. Please tell me what is wrong?  
  
 
 
 It seems that your MySQL session is set, this means that where you have a key in the block ( For example, you can not update or delete records without specifying the  primary key ).  
 Try:  
  SET SQL_SAFE_UPDATES = 0;   
 Or you can modify your query to follow the rule (use the  primary key  in  where volume . )

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