July 2015
Intermediate to advanced
482 pages
13h 28m
English
Content preview from SAS 9.4 SQL Procedure User's Guide, Second Edition, 2nd Edition
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Recall that you see this message when you run a query that joins tables without
specifying matching columns in a WHERE clause. PROC SQL also displays this
message whenever tables are joined by using an inequality operator.
The Effects of Null Values on Joins
Most database products treat nulls as distinct entities and do not match them in joins.
PROC SQL treats nulls as missing values and as matches for joins. Any null will match
with any other null of the same type (character or numeric) in a join.
The following example joins Table One and Table Two on column B. There are null
values in column B of both tables. Notice in the output that the null ...
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