Certainly! SQL (Structured Query Language) is a powerful tool for managing and querying relational databases. Whether you’re a beginner or looking to enhance your skills, here are some resources to help you master the basics:
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1. Basic SQL Syntax:
- SQL keywords
- Data types
- Operators
- SQL statements (SELECT, INSERT, UPDATE, DELETE)
2. Data Definition Language (DDL):
- CREATE TABLE
- ALTER TABLE
- DROP TABLE
- Truncate table
3. Data Manipulation Language (DML):
- SELECT statement (SELECT, FROM, WHERE, ORDER BY, GROUP BY, HAVING, JOINs)
- INSERT statement
- UPDATE statement
- DELETE statement
4. Aggregate Functions:
- SUM, AVG, COUNT, MIN, MAX
- GROUP BY clause
- HAVING clause
5. Data Constraints:
- Primary Key
- Foreign Key
- Unique
- NOT NULL
- CHECK
6. Joins:
- INNER JOIN
- LEFT JOIN
- RIGHT JOIN
- FULL OUTER JOIN
- Self Join
- Cross Join
7. Subqueries:
- Types of subqueries (scalar, column, row, table)
- Nested subqueries
- Correlated subqueries
8. Advanced SQL Functions:
- String functions (CONCAT, LENGTH, SUBSTRING, REPLACE, UPPER, LOWER)
- Date and time functions (DATE, TIME, TIMESTAMP, DATEPART, DATEADD)
- Numeric functions (ROUND, CEILING, FLOOR, ABS, MOD)
- Conditional functions (CASE, COALESCE, NULLIF)
9. Views:
- Creating views
- Modifying views
- Dropping views
10. Indexes:
- Creating indexes
- Using indexes for query optimization
11. Transactions:
- ACID properties
- Transaction management (BEGIN, COMMIT, ROLLBACK, SAVEPOINT)
- Transaction isolation levels
12. Data Integrity and Security:
- Data integrity constraints (referential integrity, entity integrity)
- GRANT and REVOKE statements (granting and revoking permissions)
- Database security best practices
13. Stored Procedures and Functions:
- Creating stored procedures
- Executing stored procedures
- Creating functions
- Using functions in queries
14. Performance Optimization:
- Query optimization techniques (using indexes, optimizing joins, reducing subqueries)
- Performance tuning best practices
15. Advanced SQL Concepts:
- Recursive queries
- Pivot and unpivot operations
- Window functions (Row_number, rank, dense_rank, lead & lag)
- CTEs (Common Table Expressions)
- Dynamic SQL