oracle 批量修改

MERGE INTO dms_wl_info a  ----> 目标表 
     USING (  SELECT c.position, SUM (c.store_qt) COUNT
                FROM dms_goods_stock c
                     LEFT JOIN sys_office d ON d.id = C.BELONG_DEPARTMENT  --> 辅助表（包含目标表需要的数据）
               WHERE     c.position IS NOT NULL
                <if test="warehouse != null and warehouse != ''">
                    AND D.PARENT_IDS LIKE '%'||#{warehouse}||'%'            --> 动态修改
                </if>
            GROUP BY c.position) b
        ON (a.wl_id = b.position)  -->  条件
WHEN MATCHED
THEN
   UPDATE SET a.can_save_qt = A.MAX_QT - b.COUNT  --> 修改语句，可以插入insert ，输出结果 output等

还有一种批量修改   update_select  语句 参看 

https://www.cnblogs.com/yelanggu/p/6489515.html