SQLServer修改主鍵

TRUNCATE TABLE reports_Transformations_Months
ALTER table reports_Transformations_Months DROP CONSTRAINT PK_reports_Transformations_Months;
ALTER table reports_Transformations_Months 
ADD CONSTRAINT PK_reports_Transformations_Months PRIMARY KEY(Id,Eid,AreaId,IndustryId);

注：清空數據，清除主鍵，重新定義主鍵（多個主鍵）

感謝：https://blog.csdn.net/onexin_smile/article/details/82022426