Question

我在MS Access查询中使用switch（）函数进行条件更新。以下是我的查询

 UPDATE T_Generated_OpportunityLine SET PlContact_c = Switch(
 LowestlevelValue_c='PTFDS - FD ENCLOSURE SYSTEMS',Select OpportunityLine_PostCode.SESA from OpportunityLine_PostCode,T_Generated_OpportunityLine where OpportunityLine_PostCode.Postcode=T_Generated_OpportunityLine.Selected_Zip AND
 OpportunityLine_PostCode.OpptyLine_Ref='PTFDS',
 LowestlevelValue_c='DOOR ENTRY SYSTEM',Select OpportunityLine_PostCode.SESA from OpportunityLine_PostCode,T_Generated_OpportunityLine where  OpportunityLine_PostCode.Postcode=T_Generated_OpportunityLine.Selected_Zip AND
 OpportunityLine_PostCode.OpptyLine_Ref='Door Entry System'
);

我知道switch（）函数的语法：

Switch ( expression1, value1, expression2, value2, ... expression_n, value_n )

我刚刚进行了一次修改，而不是传递静态值为＆＃34; 值＆＃34;部分我通过选择查询动态获取此值。

但是当我尝试执行查询时，它声明了一条错误消息：

The query must be an updatable query

我确信问题出在Switch（）函数内的Select Statement中，但是由于我的项目，我需要这个条件更新。

任何人都可以为此提供任何合适的解决方案吗？我也想知道我们能否为＆＃34;价值＆＃34;传递动态价值。 Switch（）语法中的部分？

Answer 1

我不知道这是不是你的问题，但通常需要将子查询括在括号中：

UPDATE T_Generated_OpportunityLine
     SET PlContact_c = Switch(LowestlevelValue_c='PTFDS - FD ENCLOSURE SYSTEMS',
                              (Select SESA
                               from OpportunityLine_PostCode
                                where OpportunityLine_PostCode.Postcode = T_Generated_OpportunityLine.Selected_Zip AND
                                      OpportunityLine_PostCode.OpptyLine_Ref = 'PTFDS'
                              ),
                              LowestlevelValue_c = 'DOOR ENTRY SYSTEM',
                              (Select SESA
                               from OpportunityLine_PostCode 
                               where OpportunityLine_PostCode.Postcode = T_Generated_OpportunityLine.Selected_Zip AND
                                     OpportunityLine_PostCode.OpptyLine_Ref='Door Entry System'
                              ));

但是，我只用一个子查询来写这个：

UPDATE T_Generated_OpportunityLine
     SET PlContact_c = (Select SESA
                        from OpportunityLine_PostCode as pc
                        where pc.Postcode = T_Generated_OpportunityLine.Selected_Zip AND
                              (T_Generated_OpportunityLine.LowestlevelValue_c = 'PTFDS - FD ENCLOSURE SYSTEMS' AND pc.OpptyLine_Ref = 'PTFDS' OR
                               T_Generated_OpportunityLine.LowestlevelValue_c = 'DOOR ENTRY SYSTEM' AND op.OpptyLine_Ref='Door Entry System'
                              )
                        );

MS Access查询：在Switch（）函数中使用select语句

1 个答案: