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Join Selectivity = ((num_rows(t1) - num_nulls(t1.c1)) / num_rows(t1)) * ((num_rows(t2) - num_nulls(t2.c2)) / num_rows(t2)) / greater(num_distinct(t1.c1), num_distinct(t2.c2)) Join Cardinality = Join Selectivity * filtered cardinality(t1) * filtered cardinality(t2) To translate: assume we are joining tables t1 and t2 on columns c1 and c2, respectively. We check user_tables for the num_rows in each of the two tables and check view user_tab_ col_statistics for the num_nulls and num_distinct for the two columns, and slot these values into the formula for join selectivity. (Later you will see that there is a variation of the formula that uses the density rather than the num_distinct.) The join cardinality, however, includes the filtered cardinality of each table. Remember that a general SQL statement may have some predicates other than the join predicates. These extra filter predicates are the ones that should be applied to the tables first to derive the filtered cardinality and it is possible that some of the join predicates may also function as filter predicates. The easiest way to explain the formula is through an example. The following is an extract from the script join_card_01.sql in the online code suite. As usual, my demonstration environment starts with an 8KB block size and 1MB extents, locally managed tablespaces, manual segment space management, and system statistics (CPU costing) disabled. create table t1 as select trunc(dbms_random.value(0, 25 )) trunc(dbms_random.value(0, 30 )) lpad(rownum,10) rpad('x',100) from all_objects where rownum <= 10000 ; create table t2 as select trunc(dbms_random.value(0, 50 )) trunc(dbms_random.value(0, 40 )) lpad(rownum,10) rpad('x',100) from all_objects where rownum <= 10000 ; -- vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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