1. Introduction

2. ALHAMBRA survey
2.1. Bayesian photometric redshifts in ALHAMBRA
2.2. Probability distribution functions in ALHAMBRA
2.3. Sample selection

3. Estimation of the galaxy bias from the cosmic variance

4. Clustering signal encoded in the cosmic variance
4.1. Dependence on the explored fields
4.2. Dependence on the power-spectrum model
4.3. Dependence on the probed scale
4.4. Dependence on the colour

5. Summary and conclusions