Question

我觉得必须有一种更有效的方法来做到这一点。我想允许来电者拉出所有书籍或未隐藏的书籍（见下文）

if isnull(@ShowHiddenBooks, 0) = 1
    begin
        select
            (long list of fields)
        from
            MyTable
        where
            MyField = @SomeField
    end
else
    begin
        select
            (long list of fields)
        from
            MyTable
        where
            MyField = @SomeField and
            IsHidden = 0    
    end

有什么想法吗？

谢谢！

Answer 1

Select *
from MyTable
where MyField = @SomeField and
(isHidden = 0 or @showHiddenBooks = 1)

Answer 2

这与以下内容相同：

 select (long list of fields)
    from
        MyTable
    where
        MyField = @SomeField and
        (IsHidden = 0 or isnull(@ShowHiddenBooks, 0) = 1)

使用WHERE子句重新计算简单的SQL语句

2 个答案: