Questions and Answers
What does the SQL command SELECT * FROM Payments LIMIT 10; do?
List all the records in the Payments table and display only the first 10 rows of results.
What does the SQL command SELECT checkNumber FROM Payments LIMIT 10; do?
Display all the values for checkNumber in the Payments table.
What does the SQL command SELECT paymentDate FROM Payments LIMIT 10; do?
Display all the values for paymentDate in the Payments table.
What does the SQL command SELECT amount FROM Payments LIMIT 10; do?
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What does the SQL command SELECT customerNumber FROM Payments LIMIT 10; do?
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What does the SQL command SELECT checkNumber FROM Payments ORDER BY checkNumber LIMIT 10; do?
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What does the SQL command SELECT checkNumber FROM Payments ORDER BY checkNumber DESC LIMIT 10; do?
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What does the SQL command SELECT paymentDate FROM Payments ORDER BY paymentDate LIMIT 10; do?
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What does the SQL command SELECT paymentDate FROM Payments ORDER BY paymentDate DESC LIMIT 10; do?
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What does the SQL command SELECT customerNumber FROM Payments ORDER BY customerNumber LIMIT 10; do?
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What does the SQL command SELECT customerNumber FROM Payments ORDER BY customerNumber DESC LIMIT 10; do?
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What does the SQL command SELECT checkNumber, paymentDate FROM Payments LIMIT 10; do?
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What does the SQL command SELECT checkNumber, amount FROM Payments LIMIT 10; do?
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What does the SQL command SELECT checkNumber, customerNumber FROM Payments LIMIT 10; do?
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What does the SQL command SELECT DISTINCT(customerNumber) FROM Payments LIMIT 10; do?
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What does the SQL command SELECT MIN(amount) AS 'Smallest Payment' FROM Payments; do?
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What does the SQL command SELECT MAX(amount) AS 'Largest Payment' FROM Payments; do?
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What does the SQL command SELECT AVG(amount) FROM Payments LIMIT 10; do?
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What does the SQL command SELECT MIN(paymentDate) FROM Payments LIMIT 10; do?
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What does the SQL command SELECT MAX(paymentDate) FROM Payments LIMIT 10; do?
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What does the SQL command SELECT customerNumber, SUM(amount) FROM Payments GROUP BY customerNumber LIMIT 10; do?
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What does the SQL command SELECT customerNumber, AVG(amount) FROM Payments GROUP BY customerNumber LIMIT 10; do?
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What does the SQL command SELECT COUNT(*) FROM Payments LIMIT 10; do?
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What does the SQL command SELECT COUNT(DISTINCT(customerNumber)) LIMIT 10; do?
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What does the SQL command SELECT customerNumber FROM Payments WHERE customerNumber < 200 LIMIT 10; do?
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What does the SQL command SELECT customerNumber FROM Payments WHERE customerNumber BETWEEN 200 AND 400 LIMIT 10; do?
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Study Notes
SQL Queries for Payments Table
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SELECT * FROM Payments LIMIT 10;retrieves all records, displaying the first 10 rows of the Payments table. -
SELECT checkNumber FROM Payments LIMIT 10;fetches the first 10 entries of checkNumber, offering insight into payment identifiers. -
SELECT paymentDate FROM Payments LIMIT 10;returns the initial 10 values for paymentDate, showing transaction timestamps. -
SELECT amount FROM Payments LIMIT 10;lists the first 10 recorded payment amounts, indicating financial transactions. -
SELECT customerNumber FROM Payments LIMIT 10;reveals the first 10 customerNumber values, identifying clients associated with payments.
Sorting and Ordering Results
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SELECT checkNumber FROM Payments ORDER BY checkNumber LIMIT 10;organizes checkNumber values in ascending order, displaying the top 10. -
SELECT checkNumber FROM Payments ORDER BY checkNumber DESC LIMIT 10;retrieves the first 10 checkNumber entries, sorted in descending order. -
SELECT paymentDate FROM Payments ORDER BY paymentDate LIMIT 10;sorts the paymentDate values in ascending order for the initial 10 records. -
SELECT paymentDate FROM Payments ORDER BY paymentDate DESC LIMIT 10;provides the 10 latest paymentDate values in descending order. -
SELECT customerNumber FROM Payments ORDER BY customerNumber LIMIT 10;organizes customerNumber in ascending order for the top 10 entries. -
SELECT customerNumber FROM Payments ORDER BY customerNumber DESC LIMIT 10;fetches the first 10 customerNumber entries sorted in descending order.
Multi-Column Selections
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SELECT checkNumber, paymentDate FROM Payments LIMIT 10;presents both checkNumber and paymentDate for the initial 10 entries. -
SELECT checkNumber, amount FROM Payments LIMIT 10;displays checkNumber alongside amount for the first 10 transactions. -
SELECT checkNumber, customerNumber FROM Payments LIMIT 10;provides both checkNumber and customerNumber for the top 10 records.
Unique and Aggregate Functions
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SELECT DISTINCT(customerNumber) FROM Payments LIMIT 10;generates a list of unique customerNumber values, helping to identify distinct clients. -
SELECT MIN(amount) AS 'Smallest Payment' FROM Payments;calculates and labels the minimum payment amount as 'Smallest Payment'. -
SELECT MAX(amount) AS "Largest Payment" FROM Payments;identifies the maximum payment amount, labeled as "Largest Payment". -
SELECT AVG(amount) FROM Payments LIMIT 10;computes the average payment amount for analysis. -
SELECT MIN(paymentDate) FROM Payments LIMIT 10;finds the earliest paymentDate, indicating the onset of transactions. -
SELECT MAX(paymentDate) FROM Payments LIMIT 10;identifies the most recent paymentDate for current payment trends.
Grouping and Counting Data
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SELECT customerNumber, SUM(amount) FROM Payments GROUP BY customerNumber LIMIT 10;aggregates total payment amounts for each customer, showing the first 10 groups. -
SELECT customerNumber, AVG(amount) FROM Payments GROUP BY customerNumber LIMIT 10;computes average payment amounts grouped by each customer. -
SELECT COUNT(*) FROM Payments LIMIT 10;counts total rows in the Payments table, serving as a record of transactions. -
SELECT COUNT(DISTINCT(customerNumber)) LIMIT 10;counts unique customerNumber values, providing an overview of distinct clients.
Conditional Selections
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SELECT customerNumber FROM Payments WHERE customerNumber < 200 LIMIT 10;filters customerNumber values under 200, displaying the first 10 results. -
SELECT customerNumber FROM Payments WHERE customerNumber BETWEEN 200 AND 400 LIMIT 10;retrieves customerNumber values within the specified range, highlighting a specific client segment.
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Test your knowledge of SQL commands using ClassicModels database through flashcards. Each card includes a command and its definition, providing a quick overview of key SQL functionalities. Perfect for beginners and those looking to refresh their SQL skills.
