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MongoDB uses group by and displays other column max values

2024-06-19 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >

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Shulou(Shulou.com)06/01 Report--

The following script implements the function of duplicating the word_info table through the word field and writing it to the word_info_new table

Db.word_info.aggregate ([{$group: {_ id: "$word", meaning: {$max: "$meaning"}, usphonetic: {$max: "$usphonetic"}]) .forEach (function (dc) {db.word_info_new.insert ({"word": dc._id) "meaning": dc.meaning, "usphonetic": dc.usphonetic}))

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