数据库-Oracle临时笔记存放

条件判断decode函数的使用

SELECT P.SYS_CODE,
       P.ORDER_ID,
       DECODE(P.ORDER_STATUS,
              '20100',
              '办理中',
              '20101',
              '办理成功',
              '20102',
              '办理失败') AS 订单状态
  FROM PS_ORDER P

将查询出的多个值赋值给多个变量

DECLARE 
  XM1 VARCHAR(10);
  XM2 VARCHAR(10);
  XM3 VARCHAR(10);
BEGIN
  SELECT XIANGM1,XIANGM2,XIANGM3 INTO XM1,XM2,XM3 FROM MENZFP WHERE FAPH='001500001017' AND MENZH='00003158';
END;

更新表防止空等情况出现的安全方法

-- 获取扩展表里的第三方订单号插入到base_order里
MERGE INTO BASE_ORDER_TEST F
USING (SELECT C.EXTEND_VALUE, D.ORDER_ID
         FROM PS_ORDER_EXTEND_PROPERTY C, PS_ORDER D
        WHERE D.ORDER_ID = C.ORDER_ID
          AND C.EXTEND_CODE = '800022'
          AND D.ORDER_ID = '83620033009900015146') E
ON (F.ORDER_ID = E.ORDER_ID)
WHEN MATCHED THEN
  UPDATE SET F.PARTNER_ID = E.EXTEND_VALUE;

COMMIT;

将一个数据关联的多条数据某个值合并成一条数据

/*仅需更新表名：PS_ORDER_DETAIL，需要分组的列名：ORDER_ID，需要合并的列名：PROD_OFFER_NBR*/
SELECT ORDER_ID,
              OPERATION_TYPE,
              TRANSLATE(LTRIM(TEXT, '/'), '*/', '*,') PROD_OFFER_NBR_xxx
         FROM (SELECT ROW_NUMBER() OVER(PARTITION BY ORDER_ID ORDER BY ORDER_ID, LVL DESC) RN,
                      ORDER_ID,
                      OPERATION_TYPE,
                      TEXT
                 FROM (SELECT ORDER_ID,
                              OPERATION_TYPE,
                              LEVEL LVL,
                              SYS_CONNECT_BY_PATH(PROD_OFFER_NBR, '/') TEXT
                         FROM (SELECT ORDER_ID,
                                      OPERATION_TYPE,
                                      PROD_OFFER_NBR AS PROD_OFFER_NBR,
                                      ROW_NUMBER() OVER(PARTITION BY ORDER_ID ORDER BY ORDER_ID, PROD_OFFER_NBR) X
                                 FROM PS_ORDER_DETAIL
                               -- 加入测试数据
                                WHERE ORDER_ID = '83620033009900015146'
                                ORDER BY ORDER_ID, PROD_OFFER_NBR) A
                       CONNECT BY ORDER_ID = PRIOR ORDER_ID
                              AND X - 1 = PRIOR X))
        WHERE RN = 1
        ORDER BY ORDER_ID