Question

我正在尝试在MS Access 2010中编写SQL代码，如下所示： -

select WOWPerformanceData_tbl.Style,
WOWPerformanceData_tbl.FY,
WOWPerformanceData_tbl.Month,
PrintPromotions.[Type of Offer],
PrintPromotions.Start,
PrintPromotions.End
from WOWPerformanceData_tbl
right join PrintPromtions
on WOWPerformanceData_tbl.Style=PrintPromotions.Style
where (WOWPerformanceData_tbl.Style=[Enter Style nr:]);

运行代码后，Access在指向第四行的selects PrintPromotions

的连接操作中返回错误

任何反馈都将受到赞赏..

谢谢。

Answer 1

应该是PrintPromotions而不是PrintPromtions吗？

Answer 2

这很好，因为where子句是对整个集合的评估。

SELECT WOWPerformanceData_tbl.Style,
WOWPerformanceData_tbl.FY,
WOWPerformanceData_tbl.Month,
PrintPromotions.[Type of Offer],
PrintPromotions.Start,
PrintPromotions.End
from WOWPerformanceData_tbl
LEFT join PrintPromtions
  on WOWPerformanceData_tbl.Style=PrintPromotions.Style
where (WOWPerformanceData_tbl.Style=[Enter Style nr:]);

这将排除不在wowPerformanceData_tbl中的printPromotions中的记录，这会破坏正确的连接。：

SELECT WOWPerformanceData_tbl.Style,
WOWPerformanceData_tbl.FY,
WOWPerformanceData_tbl.Month,
PrintPromotions.[Type of Offer],
PrintPromotions.Start,
PrintPromotions.End
from WOWPerformanceData_tbl
right join PrintPromtions
on WOWPerformanceData_tbl.Style=PrintPromotions.Style
where (WOWPerformanceData_tbl.Style=[Enter Style nr:]);

这样做是为了保留PrintPromotions中的所有记录以及wowperofrmanceData_tbl中匹配的记录。

SELECT WOWPerformanceData_tbl.Style,
WOWPerformanceData_tbl.FY,
WOWPerformanceData_tbl.Month,
PrintPromotions.[Type of Offer],
PrintPromotions.Start,
PrintPromotions.End
from WOWPerformanceData_tbl
right join PrintPromtions
on WOWPerformanceData_tbl.Style=PrintPromotions.Style
AND (WOWPerformanceData_tbl.Style=[Enter Style nr:]);

SQL Join操作错误

2 个答案: