SAS Hash Object Definition Macro

This macro encapsulates the object-oriented syntax of the SAS^© Data Step for Hash objects. It dynamically manages the initialization of keys (definekey method) and data variables (definedata method) from lists of variables provided as parameters. It automatically loads the Hash object with the specified dataset.

Data Analysis

Type : EXTERNE

The macro expects a dataset name as a parameter (&dataset) to load the Hash object. This dataset must exist in the SAS session when the macro is executed.

1 Code Block

DATA STEP

Explanation :
Definition of the 'create_hash' macro. It declares a Hash object linked to a dataset. It loops over the list of key variables to configure 'definekey' and over the list of data variables to configure 'definedata', before finalizing the definition with 'definedone'.

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1	%macro create_hash(name,key,data_vars,dataset);
2	declare hash &name(dataset:&dataset);
3	%local i n d;
4	%let n=%sysfunc(countw(&key));
5	rc = &name..definekey(
6	%DO i=1 %to %eval(&n-1);
7	"%scan(&key,&i)",
8	%END;
9	"%scan(&key,&i)"
10	);
11	%let n=%sysfunc(countw(&data_vars));
12	%DO i=1 %to &n;
13	%let d=%scan(&data_vars,&i);
14	rc = &name..definedata("&d");
15	%END;
16	rc = &name..definedone();
17	%mend;

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