Add SQL & PostgreSQL curriculum for veterans training

Author: jeromehardaway

README.md

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+# SQL & PostgreSQL Curriculum — Vets Who Code
+
+**Goal:** Train veterans to confidently use PostgreSQL for storing, retrieving, and managing mission-critical data.
+
+---
+
+## Module 1: PostgreSQL Basics
+
+- History & military roots (DARPA funding, Postgres origins)
+- Installing and connecting to PostgreSQL
+- Understanding databases, tables, rows, columns
+- Core SQL categories: DDL, DML, DQL, DCL, TCL
+- PostgreSQL data types (numeric, text, date/time, JSON)
+
+---
+
+## Module 2: Querying Data
+
+- `SELECT` basics and selecting specific columns
+- Filtering with `WHERE` (`=`, `>`, `<`, `LIKE`, `BETWEEN`, `IN`)
+- Removing duplicates with `DISTINCT`
+- Sorting results with `ORDER BY`
+- Using `LIMIT` for result control
+
+---
+
+## Module 3: Modifying Data
+
+- Adding data with `INSERT`
+- Changing data with `UPDATE`
+- Removing data with `DELETE` and `TRUNCATE`
+
+---
+
+## Module 4: Working with Multiple Tables
+
+- Understanding primary & foreign keys
+- Joining tables: `INNER`, `LEFT`, `RIGHT`, `FULL`
+- Aggregating with `GROUP BY` and `HAVING`
+- Using subqueries
+
+---
+
+## Module 5: Database Design & Management
+
+- Normalization basics (1NF, 2NF, 3NF)
+- Constraints: `NOT NULL`, `UNIQUE`, `PRIMARY KEY`, `FOREIGN KEY`, `CHECK`
+- Creating & altering tables (`CREATE`, `ALTER`, `DROP`)
+- Indexes for performance
+
+---
+
+## Module 6: Advanced PostgreSQL Features
+
+- Window functions (`ROW_NUMBER`, `RANK`)
+- Common Table Expressions (CTEs)
+- JSON and Array support in Postgres
+- Using `EXPLAIN` for query optimization
+
+---
+
+## Module 7: PostgreSQL Administration
+
+- Roles and permissions (`GRANT`, `REVOKE`)
+- Backups & restores (`pg_dump`, `pg_restore`)
+- Basic performance tuning
+- Maintenance tasks (`VACUUM`, `ANALYZE`)
+
+---
+
+## Capstone Project
+
+- Build and query a PostgreSQL database using real-world veteran-related datasets
+- Create reports and dashboards using SQL queries
+- Implement a role-based permission system