1527. Patients With a Condition

https://leetcode.com/problems/patients-with-a-condition/description/

 

replace, substring, concat, left, right, lower, upper, trim, length, format, instr 정도만 알아도 SQL 데이터 변형에 큰 문제가 없겠지만, Regex 문법 까지 익숙해지면 빠른 전처리에 큰 도움이 될 것 같다.

 

 

 

Write a solution to find the patient_id, patient_name, and conditions of the patients who have Type I Diabetes. Type I Diabetes always starts with DIAB1 prefix.

Return the result table in any order.

The result format is in the following example.

 

Example 1:

Input: 
Patients table:
+------------+--------------+--------------+
| patient_id | patient_name | conditions   |
+------------+--------------+--------------+
| 1          | Daniel       | YFEV COUGH   |
| 2          | Alice        |              |
| 3          | Bob          | DIAB100 MYOP |
| 4          | George       | ACNE DIAB100 |
| 5          | Alain        | DIAB201      |
+------------+--------------+--------------+
Output: 
+------------+--------------+--------------+
| patient_id | patient_name | conditions   |
+------------+--------------+--------------+
| 3          | Bob          | DIAB100 MYOP |
| 4          | George       | ACNE DIAB100 | 
+------------+--------------+--------------+
Explanation: Bob and George both have a condition that starts with DIAB1.

 

 

 

 

#  conditions 열에 'DIAB1'이라는 문자열을 포함하는 모든 행을 선택

SELECT * 
FROM patients 
WHERE conditions REGEXP '\\bDIAB1'