Write an SQL query to extract the answer directly.

Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter4: Constraints
Section: Chapter Questions
Problem 8HOA: Create a table named REP_CONTRACTS containing the columns listed in the following chart A composite...
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Write an SQL query to extract the answer directly.

Tables
patient
Columns
PatientID
Gender
Age
Indexes
Foreign Keys
Triggers
visit
Columns
VisitID
PatientID
VisitReason
Urgency
ArrivalMode
HospAdmit
Cost
Arrivaldate
Dischargedate
Indexes
Foreign Keys
Triggers
Transcribed Image Text:Tables patient Columns PatientID Gender Age Indexes Foreign Keys Triggers visit Columns VisitID PatientID VisitReason Urgency ArrivalMode HospAdmit Cost Arrivaldate Dischargedate Indexes Foreign Keys Triggers
What is the difference between (1) the maximum cost of all highest urgency ER visits and (2) the
maximum cost of all lowest urgency ER visits? Name the difference as urgency_diffcost.
The result table should contain only one row and one column.
Transcribed Image Text:What is the difference between (1) the maximum cost of all highest urgency ER visits and (2) the maximum cost of all lowest urgency ER visits? Name the difference as urgency_diffcost. The result table should contain only one row and one column.
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