将查询更改为SSRS中的表达式

Question

I am trying to turn a SQL query into an expression in SSRS; however, it seems like the behavior of the expression is not as I expected. I have done this in the past, and I do not remember it behaving this way. I am hoping someone cna shed some light on whether there is a better way to do this than I am currently trying. I know I can use a Stored Procedure to work around this, but as this is a one time thing, I was hoping to avoid that.

="if '" & Join(Parameters!pParam.Value,"") & "' = 'X'
select * from table 1
else
select * from table 2"

I expected this to be treated as a single string, but it is not. I need to do the following to treat it as a single string.

="if '" & Join(Parameters!pParam.Value,"") & "' = 'X' " & 
"select * from table 1 " & 
"else " & 
"select * from table 2"

Or I can put it all one line, which is easier with something short, but not really feasible with longer scripts.

Answer 1

why not simply go like this in your dataset instead..

select * from table1 where @pParam.Value = 'X' 
union all 
select & from table2 where @pParam.Value <> 'X'

I am assuming that both tables return matching columns and data types.

Always select your columns explicitly rather than select *!