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Sheeba
Lapis Lazuli | Level 10

HI,

Is it possible to update a table A based on the values of table B using SAS DI studio?

Table A and Table B has a common variable Var1

I need to update the column of A if  matching values of Var1 exists in B.

Thanks in advance,

Regards,

Sheeba Swaminathan

6 REPLIES 6
Scott_Mitchell
Quartz | Level 8

Create a user written transformation and use a datastep update statement.  You could also use a hash table, but that would depend on the size of the table and the amount of memory you have available.

DATA A;

DO ID = 1 TO 10;

AMOUNT = INT(RANUNI(0)*500);

OUTPUT;

END;

RUN;

PROC SORT DATA=&SYSLAST.;

BY ID;

RUN;

DATA B;

DO ID = 1 TO 10 BY 2;

AMOUNT = INT(RANUNI(0)*500);

OUTPUT;

END;

RUN;

PROC SORT DATA=&SYSLAST.;

BY ID;

RUN;

DATA WANT;

  UPDATE A

           B;

  BY ID;

RUN;

Sheeba
Lapis Lazuli | Level 10

Thanks Scott. I will try out this method.

LinusH
Tourmaline | Level 20

From you description, it sounds like standard processing, which could be performed by some standard transformations, probably no need for User Written. If B is seen as a transactions/changed data, use the Table Loader (Update Load method).

SQL Join could also work. Which one to use depends on the nature of your application.

Data never sleeps
Sheeba
Lapis Lazuli | Level 10

Thanks Linush.

I will try out that as I want to reduce the user written transformations.

Michael_SAS
SAS Employee

Take a look at the Update transform DI Studio 4.4. it supports Updates with Correlated Sub Queries

update table A

set column_A = 

( SELECT column_B

   FROM B                         

   WHERE  B.Var1 = A.Var1)

Sheeba
Lapis Lazuli | Level 10

Thanks Michael.

I will try out the update transform with exist keyword.

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