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AB_SQL in ABAP Release 7.58
ITOC

ABAP_MODIFICATION_NN New Cardinality Syntax for Joins

A new syntax for specifying the cardinality of joins is available: ${MANY $| ONE $| ${EXACT ONE$}$} TO ${MANY $| ONE $| ${EXACT ONE$}$}
This syntax allows specifying a source and a target cardinality , while the previously available numeric syntax only allowed specifying the target cardinality. The new cardinality syntax can be used to improve query performance. It can also be used in SQL path expressions and CTE associations.