thomasnield / oreilly_intermediate_sql_for_data Goto Github PK

Going to try and squeeze in this topic for future classes.

Example:

SELECT CUSTOMER_ORDER_ID, CUSTOMER_ID, PRODUCT_ID, ORDER_DATE, QUANTITY,
SUM(QUANTITY) OVER (ORDER BY ORDER_DATE ROWS UNBOUNDED PRECEDING) AS cum_sales
FROM CUSTOMER_ORDER;   

Reference:
http://mysqlserverteam.com/mysql-8-0-2-introducing-window-functions/

SQLite supports CTE so it might be worth covering briefly along with volatile tables.

https://sqlite.org/lang_with.html

• GROUP CONCAT
• REGEXP
• VOLATILE/TEMP TABLES
• CTE tables

For review

I am trying to use a SQL query with REGEXP operator in Python and it is throwing an error.

Here is my code:

from sqlalchemy import create_engine, text

engine = create_engine('sqlite:///thunderbird_manufacturing.db')
conn = engine.connect()

def reg_exp():
    stmt = text("SELECT '$181.12' REGEXP '\$181\.12' --true")
    return list(conn.execute(stmt))

print(reg_exp())

This throws the following error:

sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such function: REGEXP [SQL: "SELECT '$181.12' REGEXP '\\$181\\.12' --true"]

I tried the following query string stmt = text("SELECT \'$181.12\' REGEXP \'\$181\.12\' --true") but it throws the same error.

Can you help me correct the above code ?