MySQL server has gone away SQL query : select min(cast(tbl_povv.option_value as decimal)) as min_v from SS_product_options_set tbl_pos, SS_products_opt_val_variants tbl_povv where tbl_pos.optionID='12' and tbl_pos.variantID=tbl_povv.variantID and tbl_povv.optionID='12'