Top 50 postgresql Interview Questions
The most frequently asked postgresql questions across all roles and companies, ranked by real interview frequency. Updated daily.
Use a JOIN and COALESCE to return related rows while replacing missing values with defaults.
Amazon
Amazon Web ServicesUse a CTE and join to calculate the percentage of Messenger callers who used both voice and video calling.
MetaUse a recursive CTE to return all valid Meta Reels captions after removing the fewest invalid parentheses.
MetaCalculate the percentage of Meta users who posted a comment in May 2020 using a CTE, join, date filter, and distinct count.
MetaEvaluate PostgreSQL index choices for a filtered asset query and explain read, write, storage, and maintenance trade-offs.
AdobeUse joins and aggregation to test whether a Meta ads experiment changed sports-ad CTR.
MetaUse joins and aggregation to count distinct Meta users involved in calls by age bucket and activity flag.
MetaGenerate PostgreSQL GRANT statements to give a role access to every table in a schema.
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