52 lines
1.3 KiB
Markdown
52 lines
1.3 KiB
Markdown
3. List the names of patients who are at least fifty years old. Your query should always generate a list in which the names are sorted in alphabetical order. The ordering must not depend upon the order in which you entered data into your database.
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```SQL
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SELECT patient_name
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FROM patient
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WHERE age >= 50
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ORDER BY patient_name;
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```
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4. List the name of each type of organ, together with the total number of donations of that type of organ.
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```SQL
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SELECT organ_type, COUNT( organ_type )
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FROM organ
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INNER JOIN operation ON operation.organ_id = organ.organ_id
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GROUP BY organ_type;
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```
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5. List the identifiers of hospitals where a transplant has been performed, together with the number of transplant operations at the hospital.
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```SQL
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SELECT hospital_id, COUNT( hospital_id )
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FROM transplant_unit
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INNER JOIN operation ON transplant_unit.unit_id = operation.unit_id
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GROUP BY hospital_id;
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```
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6. Output the age of the oldest person who has donated in a hospital in Manchester.
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```SQL
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SELECT age
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FROM donor
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WHERE donor_id IN (
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SELECT donor_id
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FROM operation
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WHERE unit_id IN (
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SELECT unit_id
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FROM transplant_unit
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WHERE hospital_id IN (
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SELECT hospital_id
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FROM hospital
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WHERE city LIKE '%Manchester%'
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)
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)
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);
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``` |