SAS 9.4 SQL Procedure User's Guide, Fourth Edition, 4th Edition

Notice that OUTER UNION does not overlay columns from the two tables. To overlay

columns in the same position, use the CORRESPONDING keyword.

proc sql;

title 'A OUTER UNION CORR B';

select * from sql.a

outer union corr

select * from sql.b;

Output 3.39 Concatenating the Query Results (OUTER UNION CORR)

Producing Rows from the First Query or the Second Query

There is no keyword in PROC SQL that returns unique rows from the first and second

table, but not rows that occur in both. Here is one way that you can simulate this

operation:

(query1 except query2)

union

(query2 except query1)

This example shows how to use this operation.

proc sql;

title 'A EXCLUSIVE UNION B';

(select * from sql.a

except

select * from sql.b)

union

(select * from sql.b

except

108 Chapter 3 • Retrieving Data from Multiple Tables

select * from sql.a);

Output 3.40 Producing Rows from the First Query or the Second Query

The first EXCEPT returns one unique row from the first table (table A) only. The second

EXCEPT returns one unique row from the second table (table B) only. The middle

UNION combines the two results. Thus, this query returns the row from the first table

that is not in the second table, as well as the row from the second table that is not in the

first table.

Combining Queries with Set Operators 109

110 Chapter 3 • Retrieving Data from Multiple Tables