for all entries - dont understand
https://www.youtube.com/watch?v=opVqOM7y8wM
REPORT ytest_joins.
SELECT * FROM spfli WHERE countryfr = 'US'
INTO TABLE @DATA(it_spfli).
IF it_spfli IS NOT INITIAL.
SELECT carrid, connid, fldate FROM sflight
FOR ALL ENTRIES IN @it_spfli
WHERE carrid = @it_spfli-carrid
AND connid = @it_spfli-connid
INTO TABLE @DATA(it_sflight).
ENDIF.
DATA(lines) = lines( it_sflight ). "number of lines
cl_demo_output=>display( name = | { lines } | data = it_sflight ).
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