I have create trigger in Python but I got error

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i got this error

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from Loan where Loan.Loan_number = Borrower.Loan_number and Borrower.customer_na' at line 3

What I have tried:

<pre>import mysql.connector

connection = mysql.connector.connect(
host = "bankdata.csgjnxtaedo3.us-east-1.rds.amazonaws.com",
user="admin",
password="Admin1234",
database="cse4020_1")

cursor = connection.cursor ()
Tablename = "Accounts" # give tablename here

cursor.execute(" drop trigger if exists try_to_keep_em")

qrystr = ("""CREATE TRIGGER try_to_keep_em BEFORE UPDATE ON Tablename FOR EACH ROW 
          BEGIN 
              UPDATE Loan SET Loan.amount = Loan.amount - (0.15*Loan.amount) from Loan where Loan.Loan_number = Borrower.Loan_number and Borrower.customer_name = Depositor.customer_name and Depositor.account_number = Accounts.account_number 
          END;""")

cursor.execute(qrystr)

connection.commit()
connection.close()

Posted 17-Jun-22 16:12pm

Member 15677941

Updated 17-Jun-22 20:16pm

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OriginalGriff · Answer 1 · 2022-06-17T20:16:00

Get rid of the from Loan bit - it's not valid in an UPDATE query: SQL UPDATE Statement[^]

You should expect to get syntax errors every day, probably many times a day while you are coding - we all do regardless of how much experience we have! Sometimes, we misspell a variable, or a keyword; sometimes we forget to close a string or a code block. Sometimes the cat walks over your keyboard and types something really weird. Sometimes we just forget how many parameters a method call needs.

We all make mistakes.

And because we all do it, we all have to fix syntax errors - and it's a lot quicker to learn how and fix them yourself than to wait for someone else to fix them for you! So invest a little time in learning how to read error messages, and how to interpret your code as written in the light of what the compiler is telling you is wrong - it really is trying to be helpful!

So read this: How to Write Code to Solve a Problem, A Beginner's Guide Part 2: Syntax Errors[^] - it should help you next time you get a compilation error!