Vertical Layout DBMS: X1+X2+X3 Requires using UDF functions SQL statements using [index] joins are required double X, SUM = 0.0; int h, old_i = 0, i; while( fscanf(fp, %d%d%lf ,&i,&h,&X) != EOF ) { if ( old_i != i ) { if ( old_i != 0 ) printf( %d\t%g\r\n ,old_i,SUM); old_i = i; SUM = X; } else { SUM += X; } printf( %d\t%g\r\n ,i,SUM); String query = 'SELECT i, SUM(v) FROM X'; query += 'GROUP BY i' SELECT i, SUM(v) FROM X GROUP BY i iX1+X2+X3 1 14.2 2 14.9 3 24.0 4 21.8 5 19.0 41/60 C++ JAVA
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