用查询结果更新表格

Question

我想更新我的某个表格上的新列，但我不确定如何去解决这个问题。

新列为MARITAL_STATUS，位于SCV_CLEINT_DETAILS表上。此表中的值会从各种来源生成，并且低于这个查询得到我，我要找的值：

SELECT scd.qsclient_id, 
     scd.system_client_id, 
     NVL(c.paxus_client_id, c.client_id), 
     UPPER(NVL(NVL2(c.paxus_client_id, pc.clt_mar_stat, c.maritial_status_code), decode(c.client_type_id, '2000001702', 'C', 'U'))) AS NewMarStatus, 
     scd.marital_status 
FROM scv_client_details scd, client c, paxus_client pc 
WHERE scd.system_client_id = to_char(c.client_id) 
AND c.paxus_client_id = pc.client(+) 
AND UPPER(scd.SYSTEM_INDICATOR) = 'WRITEN' 
AND (scd.marital_status <> UPPER(NVL(NVL2(c.paxus_client_id, pc.clt_mar_stat, c.maritial_status_code), decode(c.client_type_id, '2000001702', 'C', 'U'))) OR 
    scd.marital_status IS NULL) 

我想更新与上述NewMarStatus产生价值的新MARITAL_STATUS列。我真的不知道如何编写update语句。

任何帮助真的很感激。

Answer 1

几种方法来更新加入这个其他SO描述：

• Oracle - Update statement with inner join

MERGE是做大规模，加入更新的最简单的方法之一。它可以很好地扩展，因为它可以使用各种形式的连接，特别是HASH JOIN。

的USING子句是查询（加的rowid的明显）：

MERGE INTO scv_client_details d 
USING (SELECT NVL(c.paxus_client_id, c.client_id), 
       UPPER(NVL(NVL2(c.paxus_client_id, 
          pc.clt_mar_stat, 
          c.maritial_status_code), 
         decode(c.client_type_id, '2000001702', 'C', 'U'))) 
       AS NewMarStatus, 
       scd.ROWID rid 
     FROM scv_client_details scd, client c, paxus_client pc 
     WHERE scd.system_client_id = to_char(c.client_id) 
      AND c.paxus_client_id = pc.client(+) 
      AND (scd.marital_status <> 
       UPPER(NVL(NVL2(c.paxus_client_id, 
          pc.clt_mar_stat, 
          c.maritial_status_code), 
         decode(c.client_type_id, '2000001702', 'C', 'U'))) 
       OR 
       scd.marital_status IS NULL)) v 
ON (d.ROWID = v.rid) 
WHEN MATCHED THEN 
    UPDATE SET d.marital_status = newmarstatus; 

一个完整的例子来看看这个SQLFiddle。

Answer 2

我总是对这些东西使用批量上传过程。

declare 
    cursor cur 
    is 
    SELECT scd.rowid row_id, 
      UPPER(NVL(NVL2(c.paxus_client_id, pc.clt_mar_stat, c.maritial_status_code), decode(c.client_type_id, '2000001702', 'C', 'U'))) AS marital_status 
    FROM scv_client_details scd, client c, paxus_client pc 
    WHERE scd.system_client_id = to_char(c.client_id) 
    AND c.paxus_client_id = pc.client(+) 
    AND UPPER(scd.SYSTEM_INDICATOR) = 'WRITEN' 
    AND (scd.marital_status <> UPPER(NVL(NVL2(c.paxus_client_id, pc.clt_mar_stat, c.maritial_status_code), decode(c.client_type_id, '2000001702', 'C', 'U'))) OR 
      scd.marital_status IS NULL) 
    order by row_id 
    ; 

    type type_rowid_array is table of rowid index by binary_integer; 
    type type_marital_status_array is table of scv_client_details.marital_status%type; 

    arr_rowid type_rowid_array; 
    arr_marital_status type_marital_status_array; 

begin 
    open cur; 

    loop 
     fetch cur bulk collect into arr_rowid, arr_marital_status; 

     forall i in arr_rowid.first .. arr_rowid.last 
      update scv_client_details tab 
      SET tab.marital_status = arr_marital_status(i) 
      where tab.rowid = arr_rowid(i) 
      ; 

     exit when cur%notfound; 
    end loop; 

    close cur; 
    commit; 

exception 
    when others 
    then rollback; 
     raise_application_error(-20000, 'Fout bij uitvoeren update van scv_client_details(marital_status) - '||sqlerrm); 
end;