Weight Difference Within a Last-Name Group
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Question (#41)
Note
Find the
weight
difference between the heaviest and lightest patients whose
last_name
is
'Green'
.
Expected Output
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Databases & Questions
Hint
Filter to the last name first, then subtract the smallest weight from the largest.
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Query an Entire Table
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Select Specific Columns and Assign a Default Value
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Count All Rows Without a Condition
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Count Patients by Group Condition (Single Row)
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Concatenate Strings and Filter NULL Values
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Count Patients With and Without Allergies
Count Patients by Allergy Status and return multiple rows
Filter by Birth Year and Sort by Height
Filter by a List of IDs
Filter Patients With Odd IDs
Combine Conditions on Specialty and Last Name
Filter Names by Starting Letter
Find Maximum and Minimum Height and Weight
Find Patients With the Tallest and Shortest Height
List Distinct Diagnoses of One Patient
Aggregate Diagnoses Into a Single Row
Aggregate Distinct Diagnoses per Patient
Count Distinct Diagnoses per Patient
List Distinct Cities of a Province
Province Name With Its Cities
Find First Names That Appear Exactly Once
Filter Names by Length and Last Letter
Find Patients With a Specific Diagnosis
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Weight Difference Within a Last-Name Group
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First and Last Day of Each Doctor
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Count Patients Born in a Given Year
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