How to use OR in MDX

Question

I want to return Total Sales for 2019 for County = X OR City = Y. How can I do that?

This returns error:

SELECT
{[Measures].[Total Sales]} ON 0,
{[Date].[Date].[Year].&[2019]} ON 1
FROM [Cube]
WHERE 
{([County].[County].[X]),([City].[City].[Y])}

Two sets specified in the function have different dimensionality.

Answer 1

You need to address the hierarchility and dimensionality of the sets. Use the sample below.

SELECT
{[Measures].[Total Sales]} ON 0,
{[Date].[Date].[Year].&[2019]} ON 1
FROM [Cube]
WHERE 
{
([County].[County].[X],[City].[City].defaultmember),
([County].[County].defaultmember,[City].[City].[Y])
}