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QUESTION / SQLWhich join keeps every row from the left table?ALEFT JOIN
BINNER JOIN
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Practice nowWhich window function assigns a unique sequential number to rows within each partition?
Answer to reveal explanationQUESTION LIBRARY
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A report needs the order_id and total columns only. Which query shape returns just those columns?
Practice this questionWhich predicate returns rows where status is either 'paid' or 'shipped'?
Practice this questionYou need one row per department with its employee count. Which clause groups rows before COUNT is calculated?
Practice this questionWhich clause filters departments after calculating COUNT(*) for each department?
Practice this questionA customer may have no orders, but the report must retain every customer. Which join starts from customers and preserves unmatched customers?
Practice this questionYou need products priced above the overall average price. What is a clear way to compare each price with that scalar value?
Practice this questionWhy might a CTE help in a multi-step query?
Practice this questionA report should label amounts >= 1000 as 'large' and all others as 'standard'. Which construct expresses this row-by-row logic?
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