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ABAP_CDS in ABAP Release 7.66 ITOC
ABAP_MODIFICATION_NN Cardinality in LEFT OUTER JOIN
In a LEFT OUTER JOIN, an addition TO ONE or TO MANY can be specified for the cardinality. This addition is evaluated by an SAP HANA database as a note for optimization. This option exists in earlier releases in ABAP CDS, but has been documented only from ABAP_RELEASE 7.66. In AB_SQL , the corresponding syntax was introduced in ABAP_RELEASE 7.66.
