oracle - Determine where condition based on column values -


i have requirement if getting data particular column not null, need fetch records corresponding source_type, else need fetch records based on other column. let's take example of below record

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in above case grouping done based on column grp. in particular group, if source_type column not null of records, need fetch records group have same value in source column, source_type not null. in case expected output

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but in case within group if source_type column null records, need fetch records group have same value in source column match_type='mp'.in case expected output

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looks nice job analytical functions...

with xyz (     select x.*,         count(x.source_type) on (partition x.grp, x.source) non_null_source_type#,         first_value(case when x.match_type = 'mp' x.source end) on (partition x.grp) source_from_mp$     table x ) select * xyz non_null_source_type# > 0     or non_null_source_type# = 0         , source = source_from_mp$ ;

... in case understood use case correctly.


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