Data validity and syntax

[Anonymous]

Hello All, I am building a data quality dashboard. One column is of PAN number. I to check its validity, I need to apply 3 rules and finally calculate validity % based on that. The rules are:

1) First 5 uppercase alphabets followed by 4 numeric digits and ending with one uppercase alphabet

2) The fourth character should be from list ("P","C", "H", "F", "A", "T", "B", "L", "J", "G")

3) Same PAN can't be present across multiple clients/rows

Please help. How can I achieve all these 3 rules? In power query editor or DAX?

[Anonymous · Accepted solution]

I tried to follow the specifications of the following link:

https://en.wikipedia.org/wiki/Permanent_account_number 

Test if this function is right for you. 

let
checkPAN=(PAN as text) as logical =>
let
charsPAN=Text.ToList(PAN),
fourthChars=Text.ToList("ABCEFGHLJPT"),
len=Text.Length(PAN)=10,
upper=Text.Upper(PAN)=PAN,
btwAAAZZZ="AAA"<=Text.Start(PAN,3) and Text.Start(PAN,3)<="ZZZ",
fourthChar=List.Contains(fourthChars,charsPAN{3}),
fifthChar="A" < charsPAN{4} and charsPAN{4} <"Z",
digitsPAN="0000"<Text.Range(PAN,5,4) and Text.Range(PAN,5,4)<"9999",
lastCharPAN="A" < charsPAN{9} and charsPAN{9} <"Z"
in len and upper and btwAAAZZZ and fourthChar and digitsPAN and lastCharPAN
in checkPAN

[v-eachen-msft · Accepted solution]

Hi @Anonymous ,

You could refer to the following DAX:

Column =
VAR a =
    LEFT ( 'Table'[Column1], 5 )
VAR b1 =
    MID ( 'Table'[Column1], 1, 1 )
VAR b2 =
    MID ( 'Table'[Column1], 2, 1 )
VAR b3 =
    MID ( 'Table'[Column1], 3, 1 )
VAR b4 =
    MID ( 'Table'[Column1], 4, 1 )
VAR b5 =
    MID ( 'Table'[Column1], 5, 1 )
VAR b =
    ISERROR ( VALUE ( b1 ) ) && ISERROR ( VALUE ( b2 ) )
        && ISERROR ( VALUE ( b3 ) )
        && ISERROR ( VALUE ( b4 ) )
        && ISERROR ( VALUE ( b5 ) )
VAR c =
    NOT ( ISERROR ( VALUE ( MID ( 'Table'[Column1], 6, 4 ) ) ) )
VAR d =
    EXACT ( UPPER ( RIGHT ( 'Table'[Column1], 1 ) ), RIGHT ( 'Table'[Column1], 1 ) )
VAR e =
    ISERROR ( VALUE ( RIGHT ( 'Table'[Column1], 1 ) ) )
VAR f =
    CALCULATE (
        COUNTA ( 'Table'[Column1] ),
        ALLEXCEPT ( 'Table', 'Table'[Column1] )
    ) = 1
VAR g = b4 IN { "P", "C", "H", "F", "A", "T", "B", "L", "J", "G" }
RETURN
    IF (
        EXACT ( UPPER ( a ), a ) && ISTEXT ( a )
            && b
            && c
            && d
            && e
            && f
            && g,
        1,
        0
    )

[Anonymous · Accepted solution]

I tried to follow the specifications of the following link:

https://en.wikipedia.org/wiki/Permanent_account_number 

Test if this function is right for you. 

let
checkPAN=(PAN as text) as logical =>
let
charsPAN=Text.ToList(PAN),
fourthChars=Text.ToList("ABCEFGHLJPT"),
len=Text.Length(PAN)=10,
upper=Text.Upper(PAN)=PAN,
btwAAAZZZ="AAA"<=Text.Start(PAN,3) and Text.Start(PAN,3)<="ZZZ",
fourthChar=List.Contains(fourthChars,charsPAN{3}),
fifthChar="A" < charsPAN{4} and charsPAN{4} <"Z",
digitsPAN="0000"<Text.Range(PAN,5,4) and Text.Range(PAN,5,4)<"9999",
lastCharPAN="A" < charsPAN{9} and charsPAN{9} <"Z"
in len and upper and btwAAAZZZ and fourthChar and digitsPAN and lastCharPAN
in checkPAN