(B)0[mcross-clause =
qwq> [4mCROSS[m qq> relation-clause qwqqqqqqqqqqqqqqqqqqqqqqqqqqqqwqwqq>
x mqq> [4mOVER[m qwq> field-name qwqj x
x mqqqqqq , <qqqqqj x
mqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq<qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqj
Lets you combine records from two or more record streams. You
can join these records in combinations based on the relationship
between the values of fields in the separate record streams. This
combining of records is called a relational join.
Additional Information:
explode
extract