SAS/ACCESS 9.2 for Relational Databases: Reference, Fourth Edition

SAS/ACCESS Interface to Teradata 4 How It Works 817select put(zipcode,$region.) as region,sum(sales) as sum_sales from sales.customersgroup by region;The SAS SQL processor knows how to process the PUT function. Currently,SAS/ACCESS Interface to Teradata returns all rows of unformatted data in theSALES.CUSTOMERS table in the Teradata database to the SAS System for processing.The SAS In-Database technology deploys, or publishes, the PUT functionimplementation to Teradata as a new function named SAS_PUT( ). Similar to any otherprogramming language function, the SAS_PUT( ) function can take one or more inputparameters and return an output value.The SAS_PUT( ) function supports use of SAS formats. You can specify theSAS_PUT( ) function in SQL queries that SAS submits to Teradata in one of two ways:3 implicitly by enabling SAS to automatically map PUT function calls to SAS_PUT( )function calls3 explicitly by using the SAS_PUT( ) function directly in your SAS programIf you used the SAS_PUT( ) function in the previous example, Teradata formats theZIP code values with the $REGION format and processes the GROUP BY clause usingthe formatted values.By publishing the PUT function implementation to Teradata as the SAS_PUT( )function, you can realize these advantages:3 You can process the entire SQL query inside the database, which minimizes datatransfer (I/O).3 The SAS format processing leverages the scalable architecture of the DBMS.3 The results are grouped by the formatted data and are extracted from theTeradata Enterprise Data Warehouse (EDW).Deploying SAS formats to execute inside a Teradata database can enhanceperformance and exploit Teradata parallel processing.How It WorksBy using the SAS formats publishing macro, you can generate a SAS_PUT( ) functionthat enables you to execute PUT function calls inside the Teradata EDW. You canreference the formats that SAS supplies and most custom formats that you create byusing PROC FORMAT.The SAS formats publishing macro takes a SAS format catalog and publishes it tothe Teradata EDW. Inside the Teradata EDW, a SAS_PUT( ) function, which emulatesthe PUT function, is created and registered for use in SQL queries.