Whenever a logical database cannot supply your program with all necessary data, you must program database access directly into the program itself.

Open SQL statements offer several advantages.

Native SQL statements are bound into a program using EXEC SQL [PERFORMING form.

To insure optimal database performance:

Reduce the number of database inquiries if possible (use table joins instead of nested SELECT statements, for example)

Always subject programs containing SQL statements to an SQL trace.

Is a FULL TABLE SCAN performed? Views (aggregate objects) are application specific and allow you to work with multiple database tables.

From Release 4.0 you can buffer database views.

Database view advantages:

In a join, the tables (base tables) are combined to form one results table. The join conditions are applied to this results table.

A table join is generally the most efficient way to read from the database.

At LEFT OUTER JOIN, results tables can also contain entries from the designated left hand table without the presence of corresponding data records (join conditions) from the table on the right. Initially all data is collected in an internal table. The system only selects those table entries that meet the logical condition .

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