EXPLAIN Statement for Joins 

You can also use the EXPLAIN statement for joins.

Result of the EXPLAIN Statement

EXEC SQL EXPLAIN SELECT one.key ten1.keyft1, ten2.keyft2
FROM one, ten1, ten2
WHERE ten1.keyft1 < 100
  AND ten1.ft1    = one.keyf
  AND one.
indf    = ten2.keyft2
  AND ten2.keyft2 < 100;

These EXPLAIN statement produces the following output:

TABLE NAME

COLUMN_
OR_INDEX

STRATEGY

PAGE COUNT

TEN1

ONE

TEN2

 

KEF

KEYFT2

RANGE CONDITION FOR KEY COLUMN

JOIN VIA KEY COLUMN

JOIN VIA KEY COLUMN

RESULT IS COPIED, COSTVALUE IS

1250

125

1463

97