IN operator

[Peter_23]

Hi there, I have a dude with this expression: IN , e.g. how many values its accepting? 

It's similar to SQL: You can specify up to 1000 expressions in expression_list.

One example:

EVALUATE
VAR ID_values = CALCULATEBLE (VALUES ( USER[ID] ), USER[COUNTRY] = "US" )

RETURN SWITCH ( TRUE, FACT[ID_USER] IN ID_values, TRUE() )

I mean if this tabler USER it contains 1M of record and filterint to US is 200K , is this possible to the IN operator support all records.

Thanks in advance.

[marcelsmaglhaes]

Hey @Peter_23 ,

The IN operator is a CONTAINSROW  function behind the scenes, and because of that, does not have a fixed limit.

However, performance depends on the size of the data model, relationships and available memory. In large models, IN could lead to performance issues if not optimized.

Maybe you can use a different approach :

EVALUATE
VAR MatchCheck =
EXISTS(
USER,
USER[ID] = FACT[ID_USER] && USER[COUNTRY] = "US"
)

RETURN
SWITCH(TRUE,
MatchCheck, TRUE(),
FALSE()
)

• EXISTS checks if a combination of USER[ID] and USER[COUNTRY] exists for FACT[ID_USER].
• Simpler and optimized for large datasets.

[Peter_23]

Oh, you're right! @marcelsmaglhaes 

Remarks

    Except syntax, the IN operator and CONTAINSROW function are functionally equivalent.

and what do you mean with "EXISTS" ? I guess command.. 🤔

[marcelsmaglhaes · Accepted solution]

Hey @Peter_23 

I initially confused the concepts 😅. EXISTS is a logical operator in SQL, used to check the existence of rows in a subquery. However, there is no direct EXISTS function in DAX.

In DAX, similar logic can be achieved by using functions like CALCULATE combined with COUNTROWS to check if specific conditions are met.

Here’s a cleaner version of your query:

EVALUATE
VAR MatchCheck =
CALCULATE(
COUNTROWS(USER),
USER[ID] = FACT[ID_USER],
USER[COUNTRY] = "US"
)

RETURN
SWITCH(
TRUE(),
MatchCheck > 0, TRUE(),
FALSE()
)

[Peter_23]

That's OK @marcelsmaglhaes  Don't worry be happy 😀

[parry2k]

@Peter_23 yes it will, are you running into any issue?