SQL Ass

.gitignore

@@ -102,3 +102,5 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+

Pipfile

@@ -0,0 +1,11 @@
+[[source]]
+url = "https://pypi.python.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+
+[dev-packages]
+
+[requires]
+python_version = "3.8"

module1-introduction-to-sql/Pipfile

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+[[source]]
+url = "https://pypi.python.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+python-dotenv = "*"
+psycopg2-binary = "*"
+pymongo = "*"
+dnspython = "*"
+
+[dev-packages]
+
+[requires]
+python_version = "3.8"

module1-introduction-to-sql/elephant_queries.py

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+
+import os
+from dotenv import load_dotenv
+import psycopg2
+
+
+DB_NAME = os.getenv("DB_NAME")
+DB_USER = os.getenv("DB_USER")
+DB_PASSWORD = os.getenv("DB_PASSWORD")
+DB_HOST = os.getenv("DB_HOST")
+
+connection = psycopg2.connect(dbname=DB_NAME, user=DB_USER, password=DB_PASSWORD, host=DB_HOST)
+
+cursor = connection.cursor()
+print("CONNECTION", connection)
+
+cursor.execute('SELECT * from test_table;')
+print("CURSOR", cursor)
+
+result = cursor.fetchall()
+print(result)

module1-introduction-to-sql/query.py

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+# Define query
+# How many total characters are there
+GET_CHARACTERS = """
+    SELECT COUNT(*) AS Total_Char 
+    FROM charactercreator_character;
+
+"""
+# How many of each specific subclass?
+GET_CHARACTER_SUBCLASS = """
+    SELECT COUNT(DISTINCT(name)) AS sub_class
+    FROM charactercreator_character;
+
+"""
+# How many total Items?
+GET_TOTAL_ITEMS = """
+    SELECT COUNT(*) AS Total_Items
+    FROM armory_item;
+"""
+# How many of the Items are weapons? 
+GET_ITEMS_ARE_WEAPONS = """
+    SELECT COUNT(item_id) AS items_weapons
+    FROM   armory_item AS ai
+    LEFT JOIN armory_weapon AS aw
+    ON aw.item_ptr_id = ai.item_id; 
+"""
+# How many are not?
+GET_ITEMS_ARE_NOT_WEAPONS = """
+    SELECT COUNT(*) AS items_not_weapons
+    FROM   armory_item AS ai
+    INNER JOIN armory_weapon AS aw
+    ON aw.item_ptr_id != ai.item_id; 
+"""
+# How many Items does each character have? (Return first 20 rows)
+GET_ITEMS_PER_CHARACTER = """
+    SELECT
+        cc.character_id,
+        COUNT(DISTINCT ai.item_id) AS item_per_character
+    FROM charactercreator_character AS cc
+    LEFT JOIN charactercreator_character_inventory AS ci
+    ON cc.character_id = ci.character_id
+    LEFT JOIN armory_item AS ai
+    ON ci.item_id = ai.item_id
+    GROUP BY cc.character_id
+    LIMIT 20
+
+"""
+# How many Weapons does each character have? (Return first 20 rows)
+GET_ITEMS_PER_CHARACTER = """
+    SELECT
+        cc.character_id,
+        COUNT(DISTINCT aw.item_ptr_id) AS weapon_per_character
+    FROM charactercreator_character AS cc
+    LEFT JOIN charactercreator_character_inventory AS ci
+    ON cc.character_id = ci.character_id
+    LEFT JOIN armory_weapon AS aw
+    ON ci.item_id = aw.item_ptr_id
+    GROUP BY cc.character_id
+    LIMIT 20
+
+"""
+# On average, how many Items does each character have?
+GET_ITEMS_PER_CHARACTER = """
+        SELECT AVG(item_per_character) AS avg_weapon_per_char
+        FROM (
+            SELECT
+                cc.character_id,
+                COUNT(DISTINCT ai.item_id) AS item_per_character
+            FROM charactercreator_character AS cc
+            LEFT JOIN charactercreator_character_inventory AS ci
+            ON cc.character_id = ci.character_id
+            LEFT JOIN armory_item AS ai
+            ON ci.item_id = ai.item_id
+            GROUP BY cc.character_id
+
+        )  
+"""
+# On average, how many Weapons does each character have?
+GET_WEAPON_PER_CHARACTER = """
+    SELECT AVG(weapon_count) AS avg_weapon_per_char
+    FROM (
+        SELECT
+            cc.character_id,
+            COUNT(DISTINCT aw.item_ptr_id) AS weapon_count
+        FROM charactercreator_character AS cc
+        LEFT JOIN charactercreator_character_inventory AS ci
+        ON cc.character_id = ci.character_id
+        LEFT JOIN armory_weapon AS aw
+        ON ci.item_id = aw.item_ptr_id
+        GROUP BY cc.character_id
+
+    ) subq 
+"""
+
+QUERY_LIST = [GET_CHARACTERS, GET_CHARACTER_NAMES, GET_CHARACTER_SUBCLASS,
+            GET_ITEMS, GET_ITEMS_ARE_NOT_WEAPONS, GET_ITEMS_ARE_WEAPONS,
+            GET_ITEMS_PER_CHARACTER, GET_SUBCLASS, GET_TOTAL_ITEMS, GET_WEAPON_PER_CHARACTER]

module1-introduction-to-sql/rgb_db_assignment.py

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+# 
+import sqlite3
+from query import *
+# connect the databse
+def connect_to_db(db_name="rpg_db.sqlite3"):
+    return sqlite3.connect(db_name)
+
+def execute_query(cursor, query):
+    cursor.execute(query)
+    return cursor.fetchall()
+
+
+if __name__ == "__main__":
+    # connect to DB
+    conn = connect_to_db()
+    # Create Cursor
+    curs = conn.cursor()
+    # Execute query
+    result1 = execute_query(curs, query.GET_CHARACTERS)
+    print(result1[0])
+    result2 = execute_query(curs, query.GET_CHARACTER_SUBCLASS)
+    print(result2[0])
+    result3 = execute_query(curs, query.GET_WEAPON_PER_CHARACTER)
+    print(result3[0])

module1-introduction-to-sql/rpg_db_example.py

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+import sqlite3
+
+
+def connect_to_db(db_name='rpg_db.sqlite3'):
+    return sqlite3.connect(db_name)
+def execute_query(cursor, query):
+    cursor.execute(query)
+    return cursor.fetchall()
+
+GET_CHARACTERS = """
+    SELECT *
+    FROM charactercreator_character;
+"""
+
+GET_SUBCLASS = """
+    SELECT COUNT(*) FROM charactercreator_character;
+    """
+GET_ITEMS = """
+    SELECT COUNT(DISTINCT name) FROM charactercreator_character;
+    """
+
+if __name__ == '__main__':
+    conn = connect_to_db()
+    curs = conn.cursor()
+    results = execute_query(curs, GET_CHARACTERS)
+    print(results)
+    x = len(results)
+    print(x)
+
+    results2 = execute_query(curs, GET_SUBCLASS)
+    print(results2)
+    y = len(results2)
+    print(y)
+
+    results3 = execute_query(curs, GET_ITEMS)
+    print(results3)
+    z = len(results3)
+    print(z)
+
+

module3-nosql-and-document-oriented-databases/Pipfile

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+[[source]]
+url = "https://pypi.python.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+
+[dev-packages]
+
+[requires]
+python_version = "3.8"

module3-nosql-and-document-oriented-databases/elephant_queries.py

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+
+import psycopg2
+
+DB_NAME = 'DS 23.DB'
+DB_USER = 'tlrztomk'
+DB_PASSWORD = 'bc7MwOEWu6dNtmiBc8Cn8vbXCMOttZst'
+DB_HOST = 'ziggy.db.elephantsql.com'
+connection = psycopg2.connect(dbname=DB_NAME, user=DB_USER, password=DB_PASSWORD, host=DB_HOST)
+
+cursor = connection.cursor()
+print("CONNECTION", connection)
+
+cursor.execute('SELECT * from test_table;')
+print("CURSOR", cursor)
+
+result = cursor.fetchall()
+print(result)