sql - 基于 if 条件在 where 子句中间使用 between

Question

Select * from MyTable 
    where myField = 1
    And myImportantField ???
    ...

我有以下参数：

@DoCalculateValues bit,  
@FromValue int,  
@ToValue int  

我需要这个

if @DoCalculateValues = 1 then  
check if myImportantField is between @FromValue and @ToValue  
else  
ignore values, something like "And myImportantValue = myImportantValue"

请考虑这一切都发生在“... WHERE ... AND ...”子句的中间

Answer 1

Select * from MyTable 
where myField = 1
And (@DoCalculateValues = 0
or myImportantField between @FromValue and @ToValue)

Answer 2

Select * from MyTable  
where myField = 1 
And ((myImportantField between @FromValue and @ToValue and @DoCalculateValues = 1)
OR  ( @DoCalculateValues <> 1))