Practice

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DifficultyAll easy medium hard

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

Fill the Blankseasystrings dates nullscoalescenullslit
Has an Emaileasystrings dates nullsisNotNullfilter
Tidy the Nameseasystrings dates nullstrimupperwithColumn
The Phantom Watchershardstrings dates nullsnullscoalescewhen-otherwisefilterchained-conditions
Clean Phone Digitsmediumstrings dates nullsregexp_replace
Membership Lengthmediumstrings dates nullsdatediffto_date
Plays Per Monthmediumstrings dates nullsto_datemonthgroupBy
Tag Explosionmediumstrings dates nullssplitexplodegroupBy