我用以下公式实现的：if(len(SQL("HS_UAT", "SELECT distinct project_code FROM HS_UAT.dbo.Dim_import_brand where project_name='" + C4 + "' ", 1)) = 0, SQL("HS_UAT", "SELECT distinct project_code FROM HS_UAT.dbo.BI_project_dimension_tb where project_name='" + C4 + "' ", 1), SQL("HS_UAT", "SELECT distinct project_code FROM HS_UAT.dbo.Dim_import_brand where project_name='" + C4 + "' ", 1))

弊端，当页面有数据时，公式失效，页面无数据时，公式生效，怎么避免此问题