oracle 11，更新联接 [英] oracle 11, update join

问题描述

我有一个这样的SQL语句:

I have a SQL-Statement like this:

UPDATE tbl
SET old_ht = new_ht,
    old_ttc = new_ttc
from table1 tbl 
join table2 temp ON trim(temp.val_code) = trim(tbl.val_code) 
                 AND trim(temp.tv_code) = trim(tbl.tv_code)
INNER JOIN table3 tbl3 ON  trim(tbl3.oma_CODE) =trim(temp.oma_CODE) 
                       AND trim(tbl3.men_CODE) =trim(temp.men_CODE) 
                       AND  trim(tbl3.gov_CODE) =trim(gov.BRD_CODE)
                       and tbl3.fld_id = tbl.fld_id  ;

但是看来Oracle不支持此语法.

But it seems that Oracle does not support this syntax.

我也尝试过:

UPDATE ( select tbl.cost_ht as old_ht, temp.cost_ht as new_ht,tbl.cost_ttc as old_ttc
                ,  temp.cost_ttc as new_ttc
         from table1 tbl 
         join table2 temp ON trim(temp.val_code) = trim(tbl.val_code) 
                 AND trim(temp.tv_code) = trim(tbl.tv_code)
         INNER JOIN table3 tbl3 ON  trim(tbl3.oma_CODE) =trim(temp.oma_CODE) 
                       AND trim(tbl3.men_CODE) =trim(temp.men_CODE) 
                       AND  trim(tbl3.gov_CODE) =trim(gov.BRD_CODE)
                       and tbl3.fld_id = tbl.fld_id )
SET old_ht = new_ht, old_ttc = new_ttc

但是我得到这个错误:

错误报告:

SQL错误:
ORA-01779:无法修改映射到非键保留表的列.00000-无法修改映射到非键保留表的列"
*原因:试图插入或更新联接视图的列， 映射到非保留键的表.
*操作:直接修改基础基表.

SQL Error:
ORA-01779: cannot modify a column which maps to a non key-preserved table 01779. 00000 - "cannot modify a column which maps to a non key-preserved table"
*Cause: An attempt was made to insert or update columns of a join view which map to a non-key-preserved table.
*Action: Modify the underlying base tables directly.

推荐答案

就这么简单.通过此索引为您的引擎提供更大的信心.

As simple as that.. Provide more confidence to your engine by this index.

CREATE UNIQUE INDEX IDX1
    ON TABLE1 ( VAL_CODE,TV_CODE );

CREATE UNIQUE INDEX IDX2
    ON TABLE2 ( VAL_CODE,TV_CODE, OMA_CODE ,MEN_CODE );

CREATE UNIQUE INDEX IDX3
    ON TABLE3 ( OMA_CODE ,MEN_CODE, GOV_CODE  );

然后尝试运行查询

UPDATE
      (SELECT
            TBL.COST_HT AS OLD_HT,
            TEMP.COST_HT AS NEW_HT,
            TBL.COST_TTC AS OLD_TTC,
            TEMP.COST_TTC AS NEW_TTC
       FROM
            TABLE1 TBL
            JOIN TABLE2 TEMP
                ON TRIM ( TEMP.VAL_CODE ) = TRIM ( TBL.VAL_CODE )
                   AND TRIM ( TEMP.TV_CODE ) = TRIM ( TBL.TV_CODE )
            INNER JOIN TABLE3 TBL3
                ON      TRIM ( TBL3.OMA_CODE ) = TRIM ( TEMP.OMA_CODE )
                   AND TRIM ( TBL3.MEN_CODE ) = TRIM ( TEMP.MEN_CODE )
                   AND TRIM ( TBL3.GOV_CODE ) = TRIM ( GOV.BRD_CODE )
                   AND TBL3.FLD_ID = TBL.FLD_ID)
SET
      OLD_HT        = NEW_HT,
      OLD_TTC     = NEW_TTC;

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