在SQL中，如果date，则比较dateColumn1，否则与dateColumn2比较

Question

Don't really know what could be the best title regards my problem. I don't even know if this could be possible. I will take every chance I have.

Let's go with my problem. i have @dateStart and @dateEnd then I have 2 columns for date. let's name it for example dateCol1 and dateCol2 Is it possible to create a condition on

Select * From table Where

case 1 if @dateStart is greater to sample date '1/01/2014' then it would push to the condition

dateCol1 between @dateStart and @dateEnd

else if @dateStart is less than that date i could have a condition of

dateCol2 between @dateStart and @dateEnd

I'm Not really good in SQL, so I would be really thankful if someone could help me here. by the way I'm using microsoft SQL

Answer 1

Select * From table Where case when @dateStart > '1/01/2014' then dateCol1 else dateCol2 end
between @dateStart and @dateEnd

try this solution

Answer 2

Use CASE WHEN... ELSE

 CASE
   WHEN Boolean_expression THEN.       
 result_expression [ ...n ] 
   [ ELSE else_result_expression ] 
END