Top 50 sql basics Interview Questions
The most frequently asked sql basics questions across all roles and companies, ranked by real interview frequency. Updated daily.
Use DISTINCT to return one row for each unique dataset record.
RBCIdentify Bolt regions that satisfy every defined KPI threshold using joins, conditional aggregation, and filtering.
BoltUse a PostgreSQL query to return only records whose shared key exists in both tables.
RandstadUse an INNER JOIN to return each order with the name of its matching customer.
WaystarIdentify active records in a Waymo vehicle dimension table and return their descriptive attributes in key order.
WaymoShow how left and inner joins differ when matching trades to reference data.
CitiExplain partitioning by summarizing event rows into monthly partitions using PostgreSQL date functions and aggregation.
TencentIdentify the three strongest project features using evaluation scores, missingness, joins, aggregation, and ranking.
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