case when 排序
select PartnerId, CertificateId from sis_xj_xsjbxx ORDER BY CASE WHEN @SortField = 'PartnerId' AND @SortMethod = 'ASC' THEN PartnerId END ASC, CASE WHEN @SortField = 'PartnerId' AND @SortMethod != 'ASC' THEN PartnerId END DESC, CASE WHEN @SortField = 'CertificateId' AND @SortMethod = 'ASC' THEN CertificateId END ASC, CASE WHEN @SortField = 'CertificateId' AND @SortMethod != 'ASC' THEN CertificateId END DESC
case when 排序