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Beginner · 15 min · SELECTStart →Interactive SQL exercises
Solved SQL exercises: practise from beginner to advanced
Practise SQL online through progressive business cases. Each exercise provides fictional data, hints, result validation and an explained solution.
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Data Analyst
Practise with metrics, customers and sales.
SQL · KPI · analyse métierExplore the path →Interview preparation
Train with timed, explained question sets.
30 défis · 3 niveauxStart →More filters
62 exercises shown
SELECTNo account
Select the correct columns
Show only the name and price of each product.
Level : BeginnerOpen exerciseWHERE · ORDER BYNo account
Filter and sort orders
Find orders over €50, from highest to lowest.
Level : BeginnerOpen exerciseINNER JOINSQL Essentials
Connect customers and orders
Associate each order with the name of the customer who placed it.
Level : IntermediateCompare plansDISTINCT · LIMITDiscovery
List unique categories
Display the first three unique categories in alphabetical order.
Level : BeginnerCreate a free accountNULL · COALESCEDiscovery
Replace a NULL value with COALESCE
Display clear labeling when a customer’s phone is absent.
Level : BeginnerCreate a free accountCOUNT · SUM · AVGSQL Essentials
Calculate paid order indicators
Calculate the volume, total and average over a specific area.
Level : BeginnerCompare plansGROUP BY · HAVINGSQL Essentials
Group revenue by category
Calculate totals by category and keep only the most important ones.
Level : BeginnerCompare plansLEFT JOIN · COUNTSQL Essentials
Keep customers without orders
Count the orders of each customer without excluding new registrants.
Level : BeginnerCompare plansCTE · CASESQL Essentials
Segment customers with a CTE
Calculate the total per customer, then transform this result into a business segment.
Level : IntermediateCompare plansBETWEENDiscovery
Filter a price range
Select an inclusive interval and check its limits.
Level : BeginnerCreate a free accountINDiscovery
Filter multiple statuses
Replace multiple OR with a readable business list.
Level : BeginnerCreate a free accountLIKEDiscovery
Search for a prefix with LIKE
Use a simple text pattern without confusing prefix and content.
Level : BeginnerCreate a free accountIS NULLDiscovery
Identify missing deliveries
Distinguish a missing date from an empty string or status.
Level : BeginnerCreate a free accountExpressions · ROUNDDiscovery
Calculate a price including tax
Transform a source price with a precise formula and alias.
Level : BeginnerCreate a free accountText · ConcatenationDiscovery
Assemble a product label
Create a readable label from two columns.
Level : BeginnerCreate a free accountTRIM · UPPER · DISTINCTDiscovery
Normalize a list of cities
Create a clean dimension before counting customers.
Level : BeginnerCreate a free accountDates · EXTRACTSQL Essentials
Extract the year of registration
Derive a calendar component without transforming the scope.
Level : BeginnerCompare plansDates · GROUP BYSQL Essentials
Calculate monthly revenue
Group together several channels over the same monthly period.
Level : IntermediateCompare plansDates · WHERESQL Essentials
Analyze a quarter with limits
Filter a complete period with an exclusive upper bound.
Level : IntermediateCompare plansLEFT JOIN · HAVINGSQL Essentials
Find customers without orders
Keep the starting population and isolate the absence of activity.
Level : IntermediateCompare plansEXISTSSQL Essentials
Test for the existence of a large order
Filter a population without duplicating it by its history.
Level : IntermediateCompare plansJOIN · AVGSQL Essentials
Calculate the average basket per customer
Only aggregate orders that are actually paid.
Level : IntermediateCompare plansSubquery · AVGSQL Essentials
Compare to average price
Use an aggregated value as a dynamic threshold.
Level : IntermediateCompare plansUNIONSQL Essentials
Merge customers and prospects
Create a single list from two compatible sources.
Level : IntermediateCompare plansAdditional business situationsThese exercises reuse an existing method in a new context to strengthen your reflexes.Browse 118 situations
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118 exercises shown
WHERE · ORDER BYSQL Essentials
Isolate actually paid transactions — a regional bookstore · training scenario
Isolate the actually paid operations in the context of a regional bookstore, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of bookstores.
Level : BeginnerCompare plansGROUP BY · SUMSQL Essentials
Compare value by city — a regional bookstore · training scenario
Compare the value by city in the context of a regional bookstore, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of bookstores.
Level : BeginnerCompare plansCASESQL Essentials
Prioritize amounts — a regional bookstore · training scenario
Prioritize amounts in the context of a regional bookstore, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of bookstores.
Level : BeginnerCompare plansCOUNT · GROUP BYSQL Essentials
Count volume by status — a regional bookstore · training scenario
Count volume by status in the context of a regional bookstore, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of bookstores.
Level : BeginnerCompare plansDISTINCTSQL Essentials
List active categories — a regional bookstore · training scenario
List active categories in the context of a regional bookstore, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of bookstores.
Level : BeginnerCompare plansDATE_TRUNC · SUMSQL Essentials
Follow monthly progress — a regional bookstore · training scenario
Monitor monthly developments in the context of a regional bookstore, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of bookstores.
Level : BeginnerCompare plansWHERE · ORDER BYSQL Essentials
Isolating actually paid operations — a network of clinics · training scenario
Isolate actually paid operations in the context of a network of clinics, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of clinics.
Level : BeginnerCompare plansGROUP BY · SUMSQL Essentials
Compare value by city — a network of clinics · training scenario
Compare the value by city in the context of a network of clinics, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of clinics.
Level : BeginnerCompare plansCASESQL Essentials
Prioritize amounts — a network of clinics · training scenario
Prioritize amounts in the context of a network of clinics, with a controllable outcome. You must produce the result, check it on the source data and explain what it allows you to decide in this network of clinics.
Level : BeginnerCompare plansCOUNT · GROUP BYSQL Essentials
Count volume by status — a network of clinics · training scenario
Count volume by status in the context of a network of clinics, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of clinics.
Level : BeginnerCompare plansDISTINCTSQL Essentials
List active categories — a network of clinics · training scenario
List active categories in the context of a network of clinics, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of clinics.
Level : BeginnerCompare plansDATE_TRUNC · SUMSQL Essentials
Monitor monthly progress — a network of clinics · training scenario
Monitor monthly developments in the context of a network of clinics, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of clinics.
Level : BeginnerCompare plansWHERE · ORDER BYSQL Essentials
Isolating actually paid transactions — a training organization · training scenario
Isolate the operations actually paid in the context of a training organization, with a controllable result. You must produce the result, check it on the source data and explain what it allows to decide in this training organization.
Level : BeginnerCompare plansGROUP BY · SUMSQL Essentials
Compare value by city — a training organization · training scenario
Compare the value per city in the context of a training organization, with a controllable result. You must produce the result, check it on the source data and explain what it allows to decide in this training organization.
Level : BeginnerCompare plansCASESQL Essentials
Prioritize amounts — a training organization · training scenario
Prioritize amounts in the context of a training organization, with a controllable result. You must produce the result, check it on the source data and explain what it allows to decide in this training organization.
Level : BeginnerCompare plansCOUNT · GROUP BYSQL Essentials
Count volume by status — a training organization · training scenario
Count the volume by status in the context of a training organization, with a controllable result. You must produce the result, check it on the source data and explain what it allows to decide in this training organization.
Level : BeginnerCompare plansDISTINCTSQL Essentials
List active categories — a training organization · training scenario
List active categories in the context of a training organization, with a controllable result. You must produce the result, check it on the source data and explain what it allows to decide in this training organization.
Level : BeginnerCompare plansDATE_TRUNC · SUMSQL Essentials
Monitor monthly progress — a training organization · training scenario
Monitor monthly progress in the context of a training organization, with a controllable result. You must produce the result, check it on the source data and explain what it allows to decide in this training organization.
Level : BeginnerCompare plansWHERE · ORDER BYSQL Essentials
Isolate actual paid transactions — a delivery company · training scenario
Isolate actual paid operations in the context of a delivery business, with a controllable outcome. You must produce the result, check it on the source data and explain what it allows you to decide in this delivery company.
Level : BeginnerCompare plansGROUP BY · SUMSQL Essentials
Compare value by city — a delivery company · training scenario
Compare the value by city in the context of a delivery company, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this delivery company.
Level : BeginnerCompare plansCASESQL Essentials
Prioritize amounts — a delivery company · training scenario
Prioritize amounts in the context of a delivery business, with a controllable outcome. You must produce the result, check it on the source data and explain what it allows you to decide in this delivery company.
Level : BeginnerCompare plansCOUNT · GROUP BYSQL Essentials
Count volume by status — a delivery company · training scenario
Count volume by status in the context of a delivery business, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this delivery company.
Level : BeginnerCompare plansDISTINCTSQL Essentials
List active categories — a delivery company · training scenario
List active categories in the context of a delivery business, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this delivery company.
Level : BeginnerCompare plansDATE_TRUNC · SUMSQL Essentials
Monitor monthly progress — a delivery company · training scenario
Monitor monthly progress in the context of a delivery company, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this delivery company.
Level : BeginnerCompare plansTwo focused paths reuse these experiences.
Progress remains shared: no content is duplicated.
3 exercises are available without an account, followed by 12 more in the free Discovery space. The catalogue contains a total of 62 canonical experiences. Run a first query.