Create a new column based on matching condition

[rahulgade]

Hello All

I am trying to add a new column as " Previous Year Score" which will give me a score before two years for an indivudual school.

e.g  school "A" in 2019 scored "222" for English

I want to create a new column which shows  School "A" in 2017 scored 214 in English   

All the values are in the same table. 

 many thanks

[Jimmy801]

Hello @rahulgade 

you can use a formula like this

        (row)=> try Table.SelectRows(ChangeType, each [School name]=row[School name] and [Year]=row[Year]-2 and [Assessment name]= row[Assessment name])[Score]{0} otherwise null

Here the complete code

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WclTSUTIyMLQEUql5QMJQKVYnWskJIZpWBGKDRZ3RRI3Boi4I0dxEIGECFoWaaw4z1xTZXLioGbK5cFFzZHPhohZKsbEA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"School name" = _t, Year = _t, #"Assessment name" = _t, Score = _t]),
    ChangeType = Table.TransformColumnTypes(Source,{{"School name", type text}, {"Year", Int64.Type}, {"Score", Int64.Type}}),
    AddScoreBefore2Years = Table.AddColumn
    (
        ChangeType,
        "Previous2YearScore",
        (row)=> try Table.SelectRows(ChangeType, each [School name]=row[School name] and [Year]=row[Year]-2 and [Assessment name]= row[Assessment name])[Score]{0} otherwise null
    )
in
    AddScoreBefore2Years

Copy paste this code to the advanced editor in a new blank query to see how the solution works.

If this post helps or solves your problem, please mark it as solution (to help other users find useful content and to acknowledge the work of users that helped you)
Kudoes are nice too

Have fun

Jimmy

[AlB]

Hi @rahulgade 

This is simpler in DAX.  A new calculated column:

New col =
VAR previousYear_ =
    CALCULATE (
        MAX ( Table1[Year] ),
        Table1[Year] < EARLIER ( Table1[Year] ),
        ALLEXCEPT ( Table1, Table1[School name] ),
        Table1[Assesment name]
    )
RETURN
    CALCULATE (
        DISTINCT ( Table1[Score] ),
        Table1[Year] = previousYear_,
        ALLEXCEPT ( Table1, Table1[School name] ),
        Table1[Assesment name]
    )

Please mark the question solved when done and consider giving kudos if posts are helpful.

Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers 

[rahulgade]

Hello AIB

thank you for your reply, i am getting an error in my "assessment area" 

Cannot convert value 'English' of type Text to type true/false. 

[AlB]

@rahulgade 

There was a mistake while copying the code

ew col =
VAR previousYear_ =
    CALCULATE (
        MAX ( Table1[Year] ),
        Table1[Year] < EARLIER ( Table1[Year] ),
        ALLEXCEPT ( Table1, Table1[School name], Table1[Assesment name] )
    )
RETURN
    CALCULATE (
        DISTINCT ( Table1[Score] ),
        Table1[Year] = previousYear_,
        ALLEXCEPT ( Table1, Table1[School name], Table1[Assesment name] )
    )

Please mark the question solved when done and consider giving kudos if posts are helpful.

Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers 

[rahulgade]

Hello Again @AlB , 

actual code i am using as per your instruction is , 

New col =

VAR previousYear_ =

CALCULATE (

MAX ( 'Gain Table (2)'[Year Level] ),

'Gain Table (2)'[Year Level] < EARLIER ( 'Gain Table (2)'[Year Level] ),

ALLEXCEPT ( 'Gain Table (2)','Gain Table (2)'[School Name],'Gain Table (2)'[Assessment Area] )

)

RETURN

CALCULATE (

DISTINCT ( 'Gain Table (2)'[Mean] ),

'Gain Table (2)'[Year Level] = previousYear_,

ALLEXCEPT ( 'Gain Table (2)', 'Gain Table (2)'[School Name], 'Gain Table (2)'[Assessment Area])

)

now the error i am getting " A table of multiple values was supplied where a single value was expected."

thanks 

[Icey · Accepted solution]

Hi @rahulgade ,

Try this:

Column = 
CALCULATE (
    SUM ( 'Gain Table (2)'[Mean] ),
    FILTER (
        'Gain Table (2)',
        'Gain Table (2)'[School Name] = EARLIER ( 'Gain Table (2)'[School Name] )
            && 'Gain Table (2)'[Assessment Area]
                = EARLIER ( 'Gain Table (2)'[Assessment Area] )
            && 'Gain Table (2)'[Calendar Year]
                = EARLIER ( 'Gain Table (2)'[Calendar Year] ) - 2
    )
)

Best Regards,

Icey

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[rahulgade]

Thank you very much, Icey

That was exactly what I wanted to achieve.