Practice

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DifficultyAll easy medium hard

TopicAll aggregations joins reshaping selecting and filtering strings dates nulls window functions

Clean Phone Digitsmediumstrings dates nullsregexp_replace
Membership Lengthmediumstrings dates nullsdatediffto_date
Plays Per Monthmediumstrings dates nullsto_datemonthgroupBy
Tag Explosionmediumstrings dates nullssplitexplodegroupBy