What does mean of declaration of two variables(Highlighted in bold) in below data step lines

[Rahul18]

data AHDMYHIV.CustOrd2

.

.

.

merge AHDSAS.customer_dim(in=inC) work.order_fact(in=inO);

by customer_id;

if inC=1 and inO=1;

run;

[Kurt_Bremser · Accepted solution]

Hi and welcome to the communities!

See here: IN= Dataset Option

The condition can be abbreviated to this:

if inC and inO;

[Rahul18]

Thanks i got it, In is using for contribution at time of merge of different data and at which observation it is not contributing or contributing.

[Rick_SAS]

For more about the IN= option, see the article "Where did it come from? Adding the source of each observation to a SAS data set." The article also discusses the INDSNAME= option on the SET statement, which can be a useful option to know about.