In a triangle, we use terms like adjacent and opposite. These refer to sides in relation to angles. In our musical triangle, the drummer is at one angle in the back. This side, where the audience is, is called the opposite side.
Trunc is database function, try using round for numeric values, or change the Processing of Query to database.
PROC CORR includes all nonmissing pairs of values for each pair of variables in the statistical computations. Therefore, the correlations statistics may be based on different numbers of observations. If you specify the NOMISS option, PROC CORR uses listwise deletion when a value of the BY, FREQ, VAR, WEIGHT, or WITH statement variable is missing. PROC CORR excludes all observations with missing values from the analysis. Therefore, the number of observations for each pair of variables is identical.