sppu-te-comp-content/DatabaseManagementSystems
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Tested all running queries and fixed the ones that weren't working.

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K 2024-07-31 21:37:14 +05:30
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commit 0c4e665809
Signed by: notkshitij
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Practical/Assignment-A2/Queries-A2.md
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@ -63,7 +63,7 @@ INSERT INTO Loan (loanNum, branchName, amount) VALUES
(155, "Dhole Patil", 500), (155, "Dhole Patil", 500),
(156, "Nagarwala", 250), (156, "Nagarwala", 250),
(157, "Peachtree", 600), (157, "Peachtree", 600),
(158, "Bishops", 9000), (158, "Bishops", 1400),
(159, "Amanora", 25000); (159, "Amanora", 25000);
INSERT INTO Borrower VALUES INSERT INTO Borrower VALUES
@ -110,118 +110,99 @@ SELECT Borrower.loanNum FROM Borrower INNER JOIN Loan ON Borrower.loanNum = Loan
``` ```
==TESTING PENDING==
4. List all customers in alphabetical order who have loan from Akurdi branch. 4. List all customers in alphabetical order who have loan from Akurdi branch.
```sql ```sql
SELECT customerName SELECT customerName FROM Borrower INNER JOIN Loan ON Borrower.loanNum = Loan.loanNum WHERE branchName = "Akurdi" ORDER BY customerName;
FROM Borrower
WHERE loanNum IN (SELECT loanNum FROM Loan WHERE branchName = 'Akurdi')
ORDER BY customerName;
``` ```
5. Find all customers who have an account or loan or both at bank. 5. Find all customers who have an account or loan or both at bank.
```sql ```sql
SELECT DISTINCT customerName SELECT customerName FROM Depositor UNION SELECT customerName FROM Borrower;
FROM (SELECT customerName FROM Account UNION SELECT customerName FROM Borrower) AS Customers;
``` ```
6. Find all customers who have both account and loan at bank. 6. Find all customers who have both account and loan at bank.
```sql ```sql
SELECT customerName SELECT customerName FROM Depositor INTERSECT SELECT customerName FROM Borrower;
FROM Account
WHERE customerName IN (SELECT customerName FROM Borrower);
``` ```
7. Find all customers who have account but no loan at the bank. 7. Find all customers who have account but no loan at the bank.
```sql ```sql
SELECT customerName SELECT customerName FROM Depositor WHERE customerName NOT IN (SELECT customerName FROM Borrower);
FROM Account
WHERE customerName NOT IN (SELECT customerName FROM Borrower);
``` ```
8. Find the average account balance at each branch 8. Find the average account balance at each branch
```sql ```sql
SELECT branchName, AVG(balance) AS avg_balance SELECT AVG(amount) FROM Loan;
FROM Account
GROUP BY branchName;
``` ```
9. Find no. of depositors at each branch. 9. Find no. of depositors at each branch.
```sql ```sql
SELECT branchName, COUNT(DISTINCT customerName) AS num_depositors SELECT branchName, COUNT(*) AS noOfDepositors FROM Account JOIN Depositor ON Account.accountNum = Depositor.accountNum GROUP BY branchName;
FROM Account
GROUP BY branchName;
``` ```
10. Find name of Customer and city where customer name starts with Letter P. 10. Find name of Customer and city where customer name starts with Letter K.
```sql ```sql
SELECT customerName, city SELECT customerName, customerCity from Customer where customerName like "K%";
FROM Customer
WHERE customerName LIKE 'P%';
``` ```
11. Display distinct cities of branch. 11. Display distinct cities of branch.
```sql ```sql
SELECT DISTINCT city SELECT DISTINCT branchName, branchCity FROM Branch;
FROM Branch;
``` ```
12. Find the branches where average account balance > 12000 12. Find the branches where average account balance > 1200
```sql ```sql
SELECT branchName SELECT branchName FROM Account GROUP BY branchName HAVING AVG(balance) > 1200;
FROM Account
GROUP BY branchName
HAVING AVG(balance) > 12000;
``` ```
13. Find number of tuples in customer relation. 13. Find number of tuples in customer relation.
```sql ```sql
SELECT COUNT(*) AS num_tuples SELECT COUNT(*) FROM Customer;
FROM Customer;
``` ```
14. Calculate total loan amount given by bank. 14. Calculate total loan amount given by bank.
```sql ```sql
SELECT SUM(amount) AS total_loan_amount SELECT SUM(amount) AS amount FROM Loan;
FROM Loan;
``` ```
15. Delete all loans with loan amount between 1300 and 1500. 15. Delete all loans with loan amount between 1300 and 1500.
```sql ```sql
DELETE FROM Loan DELETE FROM Borrower WHERE loanNum IN (SELECT loanNum FROM Loan WHERE amount > 1300 AND amount < 1500);
WHERE amount BETWEEN 1300 AND 1500; DELETE FROM Loan WHERE amount > 1300 AND amount < 1500;
``` ```
16. Delete all tuples at every branch located in Nigdi. 16. Delete all tuples at every branch located in Nigdi.
```sql ```sql
DELETE FROM Account DELETE FROM Borrower WHERE loanNum IN (SELECT loanNum FROM Loan WHERE branchName IN (SELECT branchName FROM Branch WHERE branchCity = "Nigdi"));
WHERE branchName IN (SELECT branchName FROM Branch WHERE city = 'Nigdi'); DELETE FROM Loan WHERE branchName = (SELECT branchName FROM Branch WHERE branchCity = "Nigdi");
DELETE FROM Depositor WHERE accountNum IN (SELECT accountNum FROM Account WHERE branchName IN (SELECT branchName FROM Branch WHERE branchCity = "Nigdi"));
DELETE FROM Account WHERE branchName = (SELECT branchName FROM Branch WHERE branchCity = "Nigdi");
DELETE FROM Branch WHERE branchName = “Nigdi”;
``` ```