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Don't forget to understand these essential SQL topics if you're just starting out. 1. SQL Basics - SELECT Statement: It's like asking the database for specific information. - FROM Clause: Tells the database where to look for that information. - WHERE Clause: Filters out the stuff you don't need. - ORDER BY Clause: Arranges the results in a specific order. 2. Data Manipulation - INSERT: Adds new data. - UPDATE: Changes existing data. - DELETE: Removes data. - MERGE: Combines these actions. 3. Data Definition - CREATE TABLE: Makes a new table. - ALTER TABLE: Edits an existing table. - DROP TABLE: Deletes a table. - INDEXES: Helps with finding data quickly. 4. Constraints - PRIMARY KEY: Ensures each row is unique. - FOREIGN KEY: Keeps data relationships intact. - UNIQUE: Ensures values are unique. - DEFAULT: Sets a value if none is given. 5. Joins (Really Important) - INNER JOIN: Combines data from different tables. - LEFT JOIN: Gets all data from one table and matching data from another. - RIGHT JOIN: Opposite of LEFT JOIN. - FULL JOIN: Gets data if it's in either table. - SELF JOIN: Links data within the same table. 6. Subqueries: - Correlated Subqueries: Subqueries connected to the main query. - Scalar Subqueries: Subqueries that return a single value. - Subquery in FROM Clause: Using a subquery as a table. 7. Aggregation Functions: - SUM, COUNT, AVG, MAX, MIN: Math on groups of data. - GROUP BY: Groups data before doing math. - HAVING: Filters groups based on math results. 8. Views: - CREATE VIEW: Makes a pretend table. - ALTER VIEW: Changes the pretend table. - DROP VIEW: Deletes the pretend table. 9. Transactions: - BEGIN TRANSACTION, COMMIT, ROLLBACK: Ensures data stays safe and consistent. - ACID Properties (Important): Rules for safe transactions. 10. Database Security: - GRANT and REVOKE: Decides who can do what. - Roles: Groups of permissions for users. 11. Normalization (Important): - 1NF, 2NF, 3NF, BCNF, 4NF: Ways to organize data for efficiency and accuracy. 12. Indexes: - Clustered vs. Non-Clustered Indexes: Different ways to find data quickly. 13. Database Management Systems (DBMS): - Different software tools for working with databases, like MySQL etc.

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#include <bits/stdc++.h> using namespace std; bool isPrime(int n) { for (int i = 2; i <= sqrt(n); i++) if (n % i == 0) return false; return true; } int main() { int n, m; cin >> n >> m; int a = 0; int b = 0; while (n < m) { if (isPrime(n)) { a = n; break; } n++; } while (n < m) { if (isPrime(m)) { b = m; break; } m--; } cout << a + b; return 0; }

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#include <bits/stdc++.h> using namespace std; int main() { int n; cin >> n; int f = 0; int s = 1; int ans = 0; if (n == 0) { cout << 0; } if (n == 1) { cout << 1; } for (int i = 2; i <= n; i++) { ans = f + s; f = s; s = ans; } cout << ans; }