Question

我现在有一些看起来像这样的SQL代码。

    insert into @SortedProducts (peid)
    select pd.ProductEntryId 
    from @ProductFilters FILT
        INNER JOIN J_ProductDetails pd ON FILT.ProductEntryId = pd.ProductEntryId
    WHERE pd.Active = 'True'
    and pd.IsRangeOfProducts = CASE WHEN @ClearanceFeatureApplied = 1 then 0 else 1 END

但是，在最后一行，我只想在@ClearanceFeatureApplied = 1的情况下应用where子句

如果@ClearanceFeatureApplied = 0，那么我不应该有这个where子句。 pd.IsRangeOfProducts也有点。

非常感谢任何建议。

谢谢！

Answer 1

只需使用布尔逻辑：

insert into @SortedProducts (peid)
    select pd.ProductEntryId 
    from @ProductFilters FILT join
         J_ProductDetails pd 
         on FILT.ProductEntryId = pd.ProductEntryId
    where pd.Active = 'True' and
          (@ClearanceFeatureApplied <> 1  or pd.IsRangeOfProducts = 0) ;

Answer 2

当@ClearanceFeatureApplied = 0时，您可以在where子句（括号括起来）中添加OR以忽略此部分：

insert into @SortedProducts (peid)
select pd.ProductEntryId 
from @ProductFilters FILT
    INNER JOIN J_ProductDetails pd ON FILT.ProductEntryId = pd.ProductEntryId
WHERE pd.Active = 'True'
and (@ClearanceFeatureApplied = 0 OR pd.IsRangeOfProducts = CASE WHEN @ClearanceFeatureApplied = 1 then 0 else 1 END)

如果位列中有空值，则需要为此进行编译。

Answer 3

如果我理解正确，那么可能是这样的：

WHERE pd.Active = 'True'
    and 1 = CASE WHEN @ClearanceFeatureApplied = 0 THEN 1 
                 WHEN pd.IsRangeOfProducts = 0 THEN 1  -- XX
                 ELSE 0 END

以上假设@ClearanceFeatureApplied不会为null。如果你到达第XX行，那么@ClearanceFeatureApplied将始终为1，所以我优化了条件：

 and pd.IsRangeOfProducts = CASE WHEN @ClearanceFeatureApplied = 1 then 0 else 1 END

到：

  pd.IsRangeOfProducts = 0

当bit = 1时，只使用where子句

3 个答案: