需要了解MDX查询

我只是一个MDX开发新手。在上面的查询中（由其他人编写），我不理解“from”部分。为什么我们要将strtoset参数放在列中，我们从Revenue cube中提取什么？

此查询包含；此功能用于筛选查询

执行查询之前，将替换所有变量，如

@employeetimeemployeemanagercode

。该功能用于降低注射攻击的风险

 SELECT 
 { [Measures].[Net] } ON COLUMNS
 , NON EMPTY 
 { ([Bill To].[Customer Name].[Customer Name].ALLMEMBERS 
 * [Bill To].[Account Type].[Account Type].ALLMEMBERS 
 * [Reporting Date].[Fiscal Period].[Fiscal Period].ALLMEMBERS ) } 
 DIMENSION PROPERTIES MEMBER_CAPTION, MEMBER_UNIQUE_NAME 
 ON ROWS 
 FROM ( SELECT ( STRTOSET(@EmployeeDimEmployeeManagerCode ) )  ON COLUMNS 
         FROM ( SELECT ( STRTOSET(@BillToDimCustAccountType ) ) ON COLUMNS 
         FROM ( SELECT ( STRTOSET(@GeneralLedgerDimGLBusinessUnit ) ) ON COLUMNS 
         FROM ( SELECT ( STRTOSET(@CompanyDimCompanyName ) ) ON COLUMNS 
         FROM ( SELECT ( STRTOMEMBER(@FromCalendarDateDimMonth ) : STRTOMEMBER(@FromCalendarDateDimMonth ).LAG(11) ) ON COLUMNS 
         FROM [Revenue])))))  WHERE ( IIF( STRTOSET(@CompanyDimCompanyName, CONSTRAINED).Count = 1
 , STRTOSET(@CompanyDimCompanyName, CONSTRAINED)
 , [Company].[Company].currentmember )
 , IIF( STRTOSET(@GeneralLedgerDimGLBusinessUnit, CONSTRAINED).Count = 1
 , STRTOSET(@GeneralLedgerDimGLBusinessUnit, CONSTRAINED)
 , [Product].[GL Business Unit].currentmember )
 , IIF( STRTOSET(@EmployeeDimEmployeeManagerCode, CONSTRAINED).Count = 1
 , STRTOSET(@EmployeeDimEmployeeManagerCode, CONSTRAINED)
 , [Order Primary Sales Assignment].[Order Primary Sales Assignment Manager Name].currentmember ) ) 
 CELL PROPERTIES VALUE, BACK_COLOR, FORE_COLOR, FORMATTED_VALUE
 , FORMAT_STRING, FONT_NAME, FONT_SIZE, FONT_FLAGS