How to find power of a number in SQLite

Question

I want to update the Interest field in my database. My SQL query is like as per below

Update Table_Name set Interest = Principal * Power(( 1 + (rate

Answer 1

You can also create an SQLite user-defined function from python. Based on the example at docs.python.org: sqlite3.Connection.create_function

Create a python function:

def sqlite_power(x,n):
    return int(x)**n
print(sqlite_power(2,3))
# 8    

Create a SQLite user-defined function based on the python function:

con = sqlite3.connect(":memory:")
con.create_function("power", 2, sqlite_power)

Use it:

cur = con.cursor()
cur.execute("select power(?,?)", (2,3))
print cur.fetchone()[0]
# 8