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Update sqlite3-python/README.md

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jay817
2024-09-21 22:05:26 -04:00
parent 85792613b5
commit 267a65039f
1 changed files with 8 additions and 7 deletions
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sqlite3-python/README.md
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@@ -20,14 +20,14 @@ class SQL:
``` ```
```python ```python
# #%%
try: get_ipython() try: get_ipython()
except: display = print except: display = print
sql = SQL() sql = SQL()
sql sql
# #%%
# 학생 테이블 생성 # 학생 테이블 생성
sql('''CREATE TABLE IF NOT EXISTS students sql('''CREATE TABLE IF NOT EXISTS students
(id INTEGER PRIMARY KEY, name TEXT, age INTEGER, grade INTEGER)''') (id INTEGER PRIMARY KEY, name TEXT, age INTEGER, grade INTEGER)''')
@@ -43,7 +43,7 @@ sql('''CREATE TABLE IF NOT EXISTS enrollments
FOREIGN KEY(course_id) REFERENCES courses(id))''') FOREIGN KEY(course_id) REFERENCES courses(id))''')
sql sql
# #%%
# 학생 데이터 삽입 # 학생 데이터 삽입
sql('INSERT INTO students (name, age, grade) VALUES (?, ?, ?)', ('김철수', 20, 2)) sql('INSERT INTO students (name, age, grade) VALUES (?, ?, ?)', ('김철수', 20, 2))
sql('INSERT INTO students (name, age, grade) VALUES (?, ?, ?)', ('이영희', 22, 4)) sql('INSERT INTO students (name, age, grade) VALUES (?, ?, ?)', ('이영희', 22, 4))
@@ -67,7 +67,7 @@ display(sql.courses)
print("\nEnrollments:") print("\nEnrollments:")
display(sql.enrollments) display(sql.enrollments)
# #%%
# JOIN을 사용하여 학생별 수강 과목 조회 # JOIN을 사용하여 학생별 수강 과목 조회
print("\n학생별 수강 과목:") print("\n학생별 수강 과목:")
enrollments_df = sql(''' enrollments_df = sql('''
@@ -78,7 +78,7 @@ enrollments_df = sql('''
''') ''')
display(enrollments_df) display(enrollments_df)
# #%%
# 특정 과목을 수강하는 학생 수 조회 # 특정 과목을 수강하는 학생 수 조회
course_name = '알고리즘' course_name = '알고리즘'
result = sql(''' result = sql('''
@@ -89,7 +89,7 @@ result = sql('''
''', (course_name,)) ''', (course_name,))
print(f"\n'{course_name}' 과목을 수강하는 학생 수: {result['student_count'].iloc[0]}") print(f"\n'{course_name}' 과목을 수강하는 학생 수: {result['student_count'].iloc[0]}")
# #%%
# 가장 많은 학생이 수강하는 과목 조회 # 가장 많은 학생이 수강하는 과목 조회
most_popular_course = sql(''' most_popular_course = sql('''
SELECT courses.name, COUNT(*) as enrollment_count SELECT courses.name, COUNT(*) as enrollment_count
@@ -101,7 +101,7 @@ most_popular_course = sql('''
''') ''')
print(f"\n가장 인기 있는 과목: {most_popular_course['name'].iloc[0]} (수강생 {most_popular_course['enrollment_count'].iloc[0]}명)") print(f"\n가장 인기 있는 과목: {most_popular_course['name'].iloc[0]} (수강생 {most_popular_course['enrollment_count'].iloc[0]}명)")
# #%%
# 최종 상태 출력 # 최종 상태 출력
print("\n최종 상태:") print("\n최종 상태:")
print("Students:") print("Students:")
@@ -110,4 +110,5 @@ print("\nCourses:")
display(sql('SELECT * FROM courses')) display(sql('SELECT * FROM courses'))
print("\nEnrollments:") print("\nEnrollments:")
display(sql('SELECT * FROM enrollments')) display(sql('SELECT * FROM enrollments'))
``` ```