6.10. SQL Drop
Removes all the data
6.10.1. Drop Index
Removes index
DROP INDEX index_name;
6.10.2. Drop Table
Removes table (with all the data)
DROP TABLE table_name;
6.10.3. Assignments
# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author
# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -v myfile.py`
# %% About
# - Name: Database Drop Index
# - Difficulty: easy
# - Lines: 2
# - Minutes: 3
# %% English
# 1. Write SQL query to delete index:
# - table: `contacts`
# - name: `contacts_lastname`
# 2. Run doctests - all must succeed
# %% Polish
# 1. Napisz zapytanie SQL aby skasować indeks:
# - tabela: `contacts`
# - nazwa: `contacts_lastname`
# 2. Uruchom doctesty - wszystkie muszą się powieść
# %% Tests
"""
>>> import sys; sys.tracebacklimit = 0
>>> from pathlib import Path
>>> import sqlite3
>>> database = Path(__file__).parent.parent / 'shop.db'
>>> db = sqlite3.connect(database)
>>> try:
... _ = db.execute(result)
... except sqlite3.OperationalError as e:
... assert 'no such index: contacts_lastname' in str(e)
>>> INDEXES = 'SELECT `name` FROM `sqlite_master` WHERE `type`="index"'
>>> indexes = {row[0] for row in db.execute(INDEXES)}
>>> assert 'contacts_lastname' not in indexes
>>> db.close()
"""
# Write SQL query to delete index:
# - table: `contacts`
# - name: `contacts_lastname`
# type: str
result = """
-- replace this comment
-- with your sql query
"""
# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author
# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -v myfile.py`
# %% About
# - Name: Database Drop Table
# - Difficulty: easy
# - Lines: 2
# - Minutes: 3
# %% English
# 1. Write SQL query to delete:
# - table: `contacts`
# 2. Run doctests - all must succeed
# %% Polish
# 1. Napisz zapytanie SQL aby skasować:
# - tabela: `contacts`
# 2. Uruchom doctesty - wszystkie muszą się powieść
# %% Tests
"""
>>> import sys; sys.tracebacklimit = 0
>>> from pathlib import Path
>>> import sqlite3
>>> database = Path(__file__).parent.parent / 'shop.db'
>>> db = sqlite3.connect(database)
>>> try:
... _ = db.execute(result)
... except sqlite3.OperationalError as e:
... assert 'no such table: contacts' in str(e)
>>> INDEXES = 'SELECT `name` FROM `sqlite_master` WHERE `type`="index"'
>>> indexes = {row[0] for row in db.execute(INDEXES)}
>>> assert 'contacts_lastname' not in indexes
>>> db.close()
"""
# Write SQL query to delete:
# - table: `contacts`
# type: str
result = """
-- replace this comment
-- with your sql query
"""