How do I combine datasets in SAS?
To merge two or more data sets in SAS, you must first sort both data sets by a shared variable upon which the merging will be based, and then use the MERGE statement in your DATA statement.
How do you merge datasets in SAS with different variable names?
3 Answers. Use the rename= data set option on either or both of the merging data sets until the key valued variables have the same variable name. If you want to retain the different variable name for the identifier, use sas proc sql. proc sql; create table mergeddata as select a.
Can these three data sets be merged in one data step?
You cannot merge these three data sets at all because they do not have a common variable.
How do I add data to an existing table in SAS?
SAS concatenates data sets (DATA step) and tables (SQL) by reading each row of data to create a new file. To avoid reading all the records, you can append the second file to the first file by using the APPEND procedure: proc append base=year1 data=year2; run; The YEAR1 file will contain all rows from both tables.
How do you add data in SAS?
Use the INSERT statement to insert data values into tables. The INSERT statement first adds a new row to an existing table, and then inserts the values that you specify into the row. You specify values by using a SET clause or VALUES clause. You can also insert the rows resulting from a query.
What is the difference between set and merge in SAS?
SET is used primarily for adding cases, but it also can be used to propagate variables across an entire file. MERGE will combine two or more files that have the same cases and different variables. It can also be used for updating values when you wish to force a change regardless of the new value.
When to use one to one merging in SAS?
However, with one-to-one reading, SAS stops processing before all observations are read from all data sets if the number of observations in the data sets is not equal. One-to-one merging combines observations from two or more SAS data sets into a single observation in a new data set.
How are interleaved data sets combined in SAS?
The observations in interleaved data sets are not combined; they are copied from the original data sets in the order of the values of the BY variable. If one table has multiple rows with the same BY value, the DATA step preserves the order of those rows in the result.
How does SAS concatenate data sets and tables?
SAS concatenates data sets (DATA step) and tables (SQL) by reading each row of data to create a new file. To avoid reading all the records, you can append the second file to the first file by using the APPEND procedure: The YEAR1 file contains all rows from both tables.
How does one to one reading in SAS work?
One-to-one reading combines observations from two or more data sets into one observation by using two or more SET statements to read observations independently from each data set. This process is also called one-to-one matching. The new data set contains all the variables from all the input data sets.