SQL Equi Join for Banking Matching Customer ,Account and Transaction Data

4.Retrieve customer details for accounts that were created on the same day a transaction was made.
SELECT Customers.CustomerID, Customers.Name, Customers.Email, Accounts.AccountID, Accounts.AccountType, Accounts.Balance, Transactions.tDate
FROM Customers, Accounts, Transactions
WHERE Customers.CustomerID = Accounts.CustomerID
AND
Accounts.AccountID = Transactions.AccountID
AND
TRUNC(Accounts.CreatedDate) = TRUNC(Transactions.tDate);
Explanation
This SQL query fetches information about customers and their accounts, alongside transactions specific to where the date of account creation must match the date of the transaction:. It fetches the ID, name and email of the customer from the Customers table and account ID, type and balance from the Accounts table as well as transaction date from the Transactions table. The query is making a join between Customers and Accounts with the CustomerID and then between Accounts and Transactions using the AccountID. It filters the results to show only those records where the date of creating the account is the same as the transaction date. This query supports identification in cases when a customer's transaction happened on the day his or her account was created and it contains the detailed information about the accounts and transactions.

5.List customer and transaction details for customers whose transaction amounts match the balance of their accounts.
SELECT c.CustomerID, c.Name, c.Email, t.TransactionID,t.Amount,t.tDate
FROM Customers c, Accounts a, Transactions t
WHERE
c.CustomerID = a.CustomerID
AND a.AccountID = t.AccountID
AND t.Amount = a.Balance;
Explanation
It picks up four particular details customer name, transaction ID, transaction amount and transaction date. To come up with this data it first joins the Customers table with the Accounts table by comparing the CustomerID to ensure that only the accounts connected to certain customers are taken into account.
Then it joins the Accounts table to the Transactions table where it equates the AccountID which would ensure only those transactions related to those accounts would be fetched.
Also, there is an important condition the query would satisfy itself by fetching only those transactions where the transaction amount equals the account balance.This means that the results will be returned where in the transaction amount in the transaction of that particular customer matches the current balance in his account.In the output that you will end up seeing here you have the customer's name the ID of the transaction the amount of the transaction and the date when this transaction occurred.
The query serves to help you get a more explicit view of customers who have an account balance equal to their transaction amount and all sorts of related information.

Benefits of Equi JOIN in SQL

Efficient Data Matching
Equi joins connect matching related data between two tables as easily as attaching customers to accounts. In a banking system for example, one may need to know which accounts a customer owns.
Clear Data Relationships
Using equi joins you can easily define and imagine how relationships are between tables. For instance, you can easily attach transaction records with specific accounts such that you can quickly analyze banking activities.
Faster Data Retrieval
Joining Equi allows fetching only data that matches between tables. Relating to banking, this means one can easily concentrate on specific kinds of customer transactions or information regarding the particular accounts not engulfing any irrelevant information.
Simplified Reporting
Equi join makes it very easy to gather pertinent information when delivering a report. For instance, where presenting a customer's account balance report, equi joins will easily enable one to merge information regarding the names of customers with account information.
Accurate Data Insights
Equi Joins Lets you deal with accurate and related yet disparate data between different tables. As such, this is very important in a banking system whereby related customer records and account details need to be correctly drawn or summed up to make analysis and decisions.

When to Use EQUI JOIN ?

Linking Related Data Across Tables
Equi join is used to equate data located within two different tables through their matching values, like when linking customer details in a banking system with their corresponding accounts.
Retrieving Only Matching Records
Whenever you would want to view the data that would show up in both tables, for example customers who have certain accounts, an equi join will produce that matching result.
Simplifying Reports
Equi joins help in formulating reports that easily put together relevant information from other tables. For example, one can develop a report that joins the customer table with the account and transaction tables for the entire picture.
Ensuring Data is Accurate and Consistent
Use an equi join when you need your data in your various tables to be properly matched. For example, you may need to ensure every account matches the appropriate customer.
Making Queries Clear and Efficient
Equi joins helps a lot in writing much tighter, effective queries by allowing one to retrieve only those rows for which the values in each table are equal.