从T-SQL转换为Access查询？

Question

Is there a convenient way to convert this T-SQL query to MS Access? The ROUND and COALESCE doesn't seem to work in Access. I'm trying to get the custom AVG field to run in Access but always gets the syntax error (missing operator) .

SELECT TOP 50 [EmployeeID]
    ,[Last Name]
    ,[First Name]
    ,[HrsThisWk]

    --AVG HRs
    ,ROUND(
     coalesce((
        coalesce([1WksAgo],0) +
        coalesce([2WksAgo],0) +
        coalesce([3WksAgo],0) +
        coalesce([4WksAgo],0) +
        coalesce([5WksAgo],0)
      )/
      nullif(
        case when coalesce([1WksAgo],0)=0 then 0 else 1 end +
        case when coalesce([2WksAgo],0)=0 then 0 else 1 end +
        case when coalesce([3WksAgo],0)=0 then 0 else 1 end +
        case when coalesce([4WksAgo],0)=0 then 0 else 1 end +
        case when coalesce([5WksAgo],0)=0 then 0 else 1 end,
      0),0), 2)
      AS '--- AVG HRs ---'

    ,[1WksAgo]
    ,[2WksAgo]
    ,[3WksAgo]
    ,[4WksAgo]
    ,[5WksAgo]

FROM [CMHR].[dbo].[tbl52weekHours_20150527]
GROUP BY
    [EmployeeID]
    ,[Last Name]
    ,[First Name]
    ,[HrsThisWk]
    ,[1WksAgo]
    ,[2WksAgo]
    ,[3WksAgo]
    ,[4WksAgo]
    ,[5WksAgo]

Answer 1

Use NZ instead of COALESCE and NULLIF , and IIF instead of CASE WHEN and "..." instead of [...] like this:

SELECT TOP(50) "EmployeeID"
    ,"Last Name"
    ,"First Name"
    ,"HrsThisWk"
    ,ROUND(
      NZ((
        NZ("1WksAgo",0) +
        NZ("2WksAgo",0) +
        NZ("3WksAgo",0) +
        NZ("4WksAgo",0) +
        NZ("5WksAgo",0)
      )/
      NZ(
        IIF(NZ("1WksAgo",0)=0, 0, 1) +
        IIF(NZ("2WksAgo",0)=0, 0, 1) +
        IIF(NZ("3WksAgo",0)=0, 0, 1) +
        IIF(NZ("4WksAgo",0)=0, 0, 1) +
        IIF(NZ("5WksAgo",0)=0, 0, 1),
      0),0), 2)
      AS "AVG HRs"

  ,"1WksAgo"
  ,"2WksAgo"
  ,"3WksAgo"
  ,"4WksAgo"
  ,"5WksAgo"

  FROM "tbl52weekHours_20150527"
  GROUP BY
   "EmployeeID"
  ,"Last Name"
  ,"First Name"
  ,"HrsThisWk"
  ,"1WksAgo"
  ,"2WksAgo"
  ,"3WksAgo"
  ,"4WksAgo"
  ,"5WksAgo"

You can create your query without TOP(50) and then set the Top Values property to 50 .