Ms Access SQL中的多权限联接问题，返回语法错误

Question

I'm having some issues with (I think) the SQL. I'm no expert here but have read that multiple joins need to be wrapped in parenthesis, however I just cannot make this work.

Maybe this isn't even the issue, this is most likely down to me not fully understanding exactly what is going on here! If someone could tell me what stupid thing I've done here that'd be great!

When I open the form where the listbox is referencing this query ComponentFinalHomeListboxQuery I get:

"Syntax error (missing operator) in query expression '[DatabaseComponentID] ='.

The list still populates but displays the error before each record appears in the listbox.

Changing the join between ComponentMasterCostQuery.DatabaseComponentID and Components.MasterDatabasecomponentID from right to inner fixes the error but does not display the records that I need. I am trying to display all records from the Components table and only those from ComponentMasterCostQuerywhere the fields are equal.

When the user adds a component to the database I need it to appear in this listbox so they can select it and add other related information stored in other tables. Once this information has all been entered the ComponentMasterCostQuery calculates the cost to manufacture the component, the ComponentFinalHomeListboxQuery picks this up and displays a cost in the listbox with the item.

• Components is the master table containing all the component Id's, names and types (pulled from the ComponentTypes table).
• ComponentTypes simply is a list of types that each component is assigned.

Here is the SQL from the query in question:

SELECT
    ComponentMasterCostQuery.DatabaseComponentID
  , Components.KadComponentID
  , Components.ComponentName
  , ComponentTypes.Type
  , ComponentMasterCostQuery.PerPartMaterialCost
  , ComponentMasterCostQuery.OperationsCost
  , ComponentMasterCostQuery.TotalManufactureCost
FROM
    ComponentTypes
    RIGHT JOIN
        (ComponentMasterCostQuery
        RIGHT JOIN
            Components
        ON
            ComponentMasterCostQuery.DatabaseComponentID = Components.MasterDatabasecomponentID)
    ON
        ComponentTypes.ID = Components.ComponentType

Apologies if this is something silly, in fumbling my way through access learning from my mistakes!

Thanks for reading if you got this far! Ryan

Answer 1

You are missing the = . But aliases make the query easier to write and to read:

SELECT cmcq.DatabaseComponentID,  c.KadComponentID, c.ComponentName, ct.Type, 
       cmcq.PerPartMaterialCost, cmcq.OperationsCost, cmcq.TotalManufactureCost
FROM ComponentTypes as ct RIGHT JOIN
     (ComponentMasterCostQuery as cmcq RIGHT JOIN
      Components as c
      ON cmcq.DatabaseComponentID = c.MasterDatabasecomponentID
     )
     ON ct.ID = c.ComponentType;

I much prefer LEFT JOIN . In fact, I almost never use RIGHT JOIN s. But I did not change your query.