Question

Thanks to the guys with suggestions on date conversion yesterday, I now have a working SELECT script.

Unfortunately, when I try to turn it into an UPDATE script, I get the dreaded

Msg 4104, Level 16, State 1, Line 25
The multi-part identifier "mbrProject.ID" could not be bound.

The entire script should insert the date from mbrProject into ProjectDates, for each matching ID (mbrProject.[ID] = ProjectDates.[Project_ID]), whilst resolving mixed US & UK format dates in mbrProject, due to users having incorrect country settings when updating the tables (not changeable from my end).

Update ProjectDates
SET ProjectDates.[Start_Date] =

(
select right([Start_Date],4) +  
    case 
        when len([Start_Date])=10 then 
            substring([Start_Date],4,2) + left([Start_Date],2)

        else    right('0' + left([Start_Date],firstIndex-1),2) + 
                right('0' + substring([Start_Date],firstIndex+1,secondIndex - firstIndex-1),2) 
                end

from 
    (
    select mp.[Start_Date], charindex('/',mp.[Start_Date],1) firstIndex,
          charindex('/',mp.[Start_Date],charindex('/',mp.[Start_Date],1)+1) secondIndex

    from mbrProject mp
    join ProjectDates pd
    on mp.ID = pd.Project_ID
    )A

where mbrProject.[ID] = ProjectDates.Project_ID
)

If I run ONLY the SELECT statement, it works fine, returning the correct values.
i.e Everything from

select right([Start_Date],4) +  
    case 

down to

from mbrProject mp
join ProjectDates pd
on mp.ID = pd.Project_ID
)A

However, as soon as I try to wrap it up in the UPDATE statement, I get the error.

I know that this is down to syntax, but wherever I try to move stuff, I can’t quite figure it out.

Any ideas please?

Thanks
Craig

Answer 1

Try this:

UPDATE PR
SET PR.[Start_Date] = A.[Corrected_Start_Date]
FROM ProjectDates PR
    JOIN
    (
        SELECT
            [Id],
            RIGHT([Start_Date],4) +  
            CASE
                WHEN len([Start_Date])=10
                THEN substring([Start_Date],4,2) + LEFT([Start_Date],2)
                ELSE RIGHT('0' + LEFT([Start_Date],firstIndex-1),2) + 
                         RIGHT('0' + substring([Start_Date],firstIndex+1,secondIndex - firstIndex-1),2) 
            END [Corrected_Start_Date]
        FROM 
        (
            SELECT
                        [Id],
                        [Start_Date],
                        charindex('/',[Start_Date],1) firstIndex,
                        charindex('/',[Start_Date],charindex('/',[Start_Date],1)+1) secondIndex
            FROM mbrProject
        ) S
    ) A
ON A.[ID] = PR.[Project_ID]