附近有語法錯誤「加入」

Question

我下面的查詢導致錯誤：

Incorrect syntax near the keyword 'join'.

Select top 1 
    a.mkey, emp_received, a.mkey, 
    c.type_desc DOC_TYPE, a.doc_no INWARD_NO, 
    c.type_desc dept_received, c.type_desc EMP_RECEIVED, 
    convert(varchar, a.doc_date, 103) date, 
    a.to_user, a.No_of_pages, Ref_No, c.type_desc, 
    e.emp_name NAME, 
    ISNULL(e.Email_Id_Official, 'abc@test.com') EMAILID 
from 
    inward_doc_tracking_hdr a 
left join 
    type_mst_a c on a.doc_type = c.master_mkey 
       and 
left join 
    type_mst_a c on a.dept_received = c.master_mkey 
left join 
    emp_mst e on a.emp_received = e.mkey 
where 
    a.emp_received is not null 
    and a.mkey = (select mkey 
        from inward_doc_tracking_hdr aa 
        where doc_no='IW/16/97') 

我不知道爲什麼它是導致該錯誤

按照戈登的回答，我爲emp_received添加了一個左連接，但它不起作用

Select top 1 a.mkey, 
      cd.type_desc as DOC_TYPE, a.doc_no as INWARD_NO, 
      cr.type_desc as DEPT_RECEIVED, qr.type_desc as EMP_RECEIVED, 
      convert(varchar(255), a.doc_date,103) as date, 
      a.to_user, a.No_of_pages, Ref_No, 
      e.emp_name as NAME, 
      coalesce(e.Email_Id_Official, 'test@test.com') EMAILID 
    from inward_doc_tracking_hdr a left join 
     type_mst_a cd 
     on a.doc_type = cd.master_mkey left join 
     type_mst_a cr  
     on a.emp_received = qr.master_mkey left join 
     type_mst_a st 
     on a.dept_received = cr.master_mkey left join 
     emp_mst e 
     on a.emp_received = e.mkey 
    where a.emp_received is not null and 
      a.mkey = (select mkey 
        from inward_doc_tracking_hdr aa 
        where doc_no = 'IW/16/97' 
        ); 

Answer 1

我想你想查詢更是這樣的：

Select top 1 a.mkey,emp_received , 
     a.mkey, cd.type_desc as DOC_TYPE, a.doc_no as INWARD_NO, 
     cr.type_desc as dept_received, cr.type_desc as EMP_RECEIVED, 
     convert(varchar(255), a.doc_date,103) as date, 
     a.to_user, a.No_of_pages, Ref_No, 
     e.emp_name as NAME, 
     coalesce(e.Email_Id_Official, 'test@test.com') as EMAILID 
from inward_doc_tracking_hdr a left join 
    type_mst_a cd 
    on a.doc_type = cd.master_mkey left join 
    type_mst_a cr 
    on a.dept_received = cr.master_mkey left join 
    emp_mst e 
    on a.emp_received = e.mkey 
where a.emp_received is not null and 
     a.mkey = (select mkey 
       from inward_doc_tracking_hdr aa 
       where doc_no = 'IW/16/97' 
       ); 

注：

• 眼前的問題是and left join。 and會導致語法錯誤。
• 你有兩個具有相同別名的表。這是不允許的。
• 您需要注意哪些列來自哪些表;我做了一個很好的猜測。
• 無論何時在SQL Server中使用varchar()，都要包含一個長度。默認長度因上下文而異，如果您懶惰，您可能會在某個時候遭受難以調試的錯誤。
• 定義列別名時使用as。