2 Calculated columns, return next value and previous value

[dpiechowski]

I need to create a pair of calculated columns that return the next and previous TRUE_MACH_NO of each grouped ORDER_NO & SPEC_NO determined by MACH_SEQ_NO. Sometimes the TRUE_MACH_NO is the same twice in a row because the product does have to go through the same machine twice, but this is reflected in the table as an incremented MACH_SEQ_NO. The MACH_SEQ_NO sometimes has decimals (I don't know why) and sometimes even goes negative (I REALLY don't know why)...

SPEC_NO	MACH_SEQ_NO	TRUE_MACH_NO	PREV_MACH	NEXT_MACH
556927	1	23	null	64
556927	2	64	23	64
556927	3	64	64	3001
556927	4	3001	64	3001
556927	5	3001	3001	900
556927	6	900	3001	null

[Anonymous]

Before writing DAX, you really should UNDERSTAND your data... If you don't know why some numbers are decimal... well, that spells troubles.

Best
D

[az38]

Hi @dpiechowski 

try

Prev_Mach = 
var _curMACH_SEQ_NO = [MACH_SEQ_NO]
var _prevMACH_SEQ_NO = CALCULATE(MAX(Table[MACH_SEQ_NO], ALLEXCEPT(Table, Table[ORDER_NO], Table[SPEC_NO]), Table[MACH_SEQ_NO] <  _curMACH_SEQ_NO )
RETURN
CALCULATE(MAX(Table[TRUE_MACH_NO]), ALLEXCEPT(Table, Table[ORDER_NO], Table[SPEC_NO]), Table[MACH_SEQ_NO] = _prevMACH_SEQ_NO)

and

Prev_Mach = 
var _curMACH_SEQ_NO = [MACH_SEQ_NO]
var _nextMACH_SEQ_NO = CALCULATE(MIN(Table[MACH_SEQ_NO], ALLEXCEPT(Table, Table[ORDER_NO], Table[SPEC_NO]), Table[MACH_SEQ_NO] > _curMACH_SEQ_NO )
RETURN
CALCULATE(MAX(Table[TRUE_MACH_NO]), ALLEXCEPT(Table, Table[ORDER_NO], Table[SPEC_NO]), Table[MACH_SEQ_NO] = _nextMACH_SEQ_NO)

[dpiechowski]

Thank you. I think this is the right way to go, but I can't seem to get the syntax correct. It says 'Unexpected Parameter' and I'm not quite sure how to adjust it to clear the error.

[lbendlin]

here are some examples of possible solutions.

Prev = 
var sn='Table (4)'[SPEC_NO]
var ms='Table (4)'[MACH_SEQ_NO]-1
var m=CALCULATE(max('Table (4)'[TRUE_MACH_NO]),all('Table (4)'),treatas({(sn,ms)},'Table (4)'[SPEC_NO],'Table (4)'[MACH_SEQ_NO]))
return m

Next = 
var sn='Table (4)'[SPEC_NO]
var ms='Table (4)'[MACH_SEQ_NO]+1
var m=CALCULATE(max('Table (4)'[TRUE_MACH_NO]),all('Table (4)'),'Table (4)'[SPEC_NO]=sn,'Table (4)'[MACH_SEQ_NO]=ms)
return m

[dpiechowski]

This seems to work really well except for the non-integer MACH_SEQ_NO rows, since var ms is subtracting 1 from itself it will miss any non-standard steps in the sequence. This is a good start though! Thank you.