Question

我需要使用已被删除的值更新表列。为了增加更多的复杂性，我需要基于派生来连接一个值，因此为concat追加的值并不总是相同的。我想出了这个查询，但它显然有问题。

    update TRANSFER set PROCESS_STATUS = concat ( PREDICATE , 
                (select dom_value from DOMAIN_VALUES dv where dv.val_id = st.sr_cashflow_status
CASE PREDICATE WHEN dv.dom_value = 'ZZZZ' THEN 'SPB'
                         WHEN dv.dom_value = 'XXXX' THEN 'SPB'
                         WHEN dv.dom_value = 'YYYY' THEN 'SPB'
              ELSE 'DPS'
                         END ))         from TRANSFER st
    where PROCESS_STATUS is null;

我的主要问题是如何将appender（此处为谓词）维护为可以通过join获得的值检查的动态值？

任何答案/方向都非常赞赏。

Answer 1

我想您正在努力实现以下内容（考虑PREDICATE是TRANSFER表中的一列） -

MERGE INTO TRANSFER st 
   using (select CASE 
            WHEN dv.dom_value = 'ZZZZ' THEN 'SPB'
            WHEN dv.dom_value = 'XXXX' THEN 'SPB'
            WHEN dv.dom_value = 'YYYY' THEN 'SPB'
            ELSE 'DPS'
            END as key,
            val_id
           from DOMAIN_VALUES) dv
      on (dv.val_id = st.sr_cashflow_status and st.PROCESS_STATUS is NULL)         
    WHEN MATCHED THEN
         UPDATE SET PROCESS_STATUS = concat(PREDICATE,dv.key);

OR

MERGE INTO TRANSFER st 
       using (select CASE 
                WHEN dv.dom_value = 'ZZZZ' THEN 'SPB'
                WHEN dv.dom_value = 'XXXX' THEN 'SPB'
                WHEN dv.dom_value = 'YYYY' THEN 'SPB'
                ELSE 'DPS'
                END as key,
                val_id
               from DOMAIN_VALUES) dv
          on (dv.val_id = st.sr_cashflow_status and st.PROCESS_STATUS is NULL)         
        WHEN MATCHED THEN
             UPDATE SET PROCESS_STATUS = PREDICATE||dv.key;

关于CASE语句语法的快速说明。语法看起来不正确，因为您没有将CASE的结果与任何内容进行比较，因为您在WHERE子句中使用它，而且您也缺少AND子句。

update TRANSFER set PROCESS_STATUS = concat ( PREDICATE , 
                (select dom_value from DOMAIN_VALUES dv where dv.val_id =            st.sr_cashflow_status
                   CASE PREDICATE WHEN dv.dom_value = 'ZZZZ' THEN 'SPB' -- and clause missing
                         WHEN dv.dom_value = 'XXXX' THEN 'SPB'
                         WHEN dv.dom_value = 'YYYY' THEN 'SPB'
                   ELSE 'DPS'
                         END ))         --comparison missing like CASE ... END = 'SPB' since the case is inside WHERE
       from TRANSFER st                 -- you cannot have a FROM clause in UPDATE
    where PROCESS_STATUS is null;

Oracle结束了一个动态值

1 个答案: