1. INTRODUCTION

2. DATASET
   2.1. The SDSS-DECaLS Dataset
   2.2. The Photometric Noise Estimation

3. THE STRUCTURE FUNCTION

4. THE VARIABILITY AMPLITUDE DEPENDENCY ON THE QUASAR PROPERTIES

5. THE VARIABILITY AMPLITUDE DEPENDENCY ON THE EDDINGTON RATIO
   5.1. An Extended Result of Black Hole Mass
   5.2. The Eddington Ratio as a Main Factor of Variability

7. CONCLUSIONS