Max(Date) vs Lastdate(Date): which one should use for better performance

[jatneerjat]

Hi,

As i am working on improving performance of measures, which function should i use to get the latest date from a date table?

Max(Date) or LastDate(Date)

Thanks

[v-piga-msft]

Hi @jatneerjat,

Have you solved your problem?

If you have solved, please accept the replies making sense as solution to your question so that people who may have the same question can get the solution directly.

Best  Regards,

Cherry

[Stachu · Accepted solution]

in this article there is a short paragraph about the 2
https://www.sqlbi.com/articles/semi-additive-measures-in-dax/

basically LASTDATE returns a table of one column and one row, while MAX returns scalar value
accoriding to the article this code is equivalent to LASTDATE

        FILTER (
            ALL( 'Date'[Date] ), 
            'Date'[Date] = MAX ( 'Date'[Date] )
        )

so to answer your question if you need a scalar I'd use MAX

on optimization in general - I recommend watching this video and in avoiding iterator functions on full tables if possible
https://www.sqlbi.com/tv/optimizing-dax-queries/