php - Access denied for user 'root'@'localhost' (using password: NO) error in Mysql -

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i have worked on mysql database until yesterday, today when trying access mysql gave following error.

error 1045 (28000): access denied user 'root'@'localhost' (using password: yes)

i want existing databases since have not got backup. further, have followed step on following lnks , still haven't found solution problem.


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