Hidden secrets and advanced techniques about SQL🏂



Optimization Secrets👇


1. Indexing: Create indexes on frequently queried columns.

2. Query caching: Store results of complex queries.

3. Partitioning: Divide large tables into smaller segments.

4. Materialized views: Precompute complex queries.


Advanced Query Techniques👇


1. Window functions (ROW_NUMBER, RANK, etc.)

2. Common Table Expressions (CTEs)

3. Recursive queries

4. Full-text search


Data Modeling Secrets👇


1. Denormalization: Store redundant data for performance.

2. Entity-Attribute-Value (EAV) modeling

3. Star and snowflake schema design

4. Data warehousing


Security Secrets👇


1. Encryption: Protect sensitive data.

2. Row-level security (RLS)

3. Dynamic data masking

4. SQL injection prevention


Performance Secrets👇


1. Query parallelization

2. Asynchronous queries

3. Database connection pooling

4. Caching query results


Lesser-known SQL Functions👇


1. LEAD and LAG functions

2. PERCENT_RANK and CUME_DIST

3. LISTAGG and STRING_AGG

4. JSON and XML functions


Database Design Best Practices👇


1. Normalize data to reduce redundancy.

2. Use primary and foreign keys.

3. Avoid correlated subqueries.

4. Document database schema.


SQL Standards and Versions👇


1. SQL-92 (standard)

2. SQL:2011 (standard)

3. SQL Server, Oracle, MySQL, PostgreSQL versions


Tools and Resources👇


1. DB Browser (SQLite)

2. SQL Fiddle (online editor)

3. SQL Server Management Studio (SSMS)

4. Oracle SQL Developer

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