Merge pull request #4 from Vipul1432/feature/detailed-sql-cheatsheet

Update commands/README.md to reflect completion of all SQL commands

Author: Vipul1432

commands/README.md

@@ -15,14 +15,14 @@ commands/
 │ ├── SELECT.md # Query data
 │ ├── INSERT.md # Add new records
 │ ├── UPDATE.md # Modify existing records
-│ └── DELETE.md # Remove records (Coming Soon)
+│ └── DELETE.md # Remove records
 ├── DCL/ # Data Control Language
-│ ├── GRANT.md # Give permissions (Coming Soon)
-│ └── REVOKE.md # Remove permissions (Coming Soon)
+│ ├── GRANT.md # Give permissions
+│ └── REVOKE.md # Remove permissions
 └── TCL/ # Transaction Control Language
- ├── COMMIT.md # Save changes (Coming Soon)
- ├── ROLLBACK.md # Undo changes (Coming Soon)
- └── SAVEPOINT.md # Set transaction savepoint (Coming Soon)
+ ├── COMMIT.md # Save changes
+ ├── ROLLBACK.md # Undo changes
+ └── SAVEPOINT.md # Set transaction savepoint
 ```
 
 ---
@@ -55,45 +55,57 @@ DML commands are used to manipulate data within database objects.
 
 ### ✅ Available Commands
 
-| Command | Purpose | Status  | Description |
-| --------------------------- | -------------- | -------------- | ------------------------------------------------------ |
-| **[SELECT](DML/SELECT.md)** | Query Data | ✅ Complete  | Retrieve data with filtering, sorting, grouping, joins |
-| **[INSERT](DML/INSERT.md)** | Add Records | ✅ Complete  | Add new rows with various data sources and methods |
-| **[UPDATE](DML/UPDATE.md)** | Modify Records | ✅ Complete  | Change existing data with conditions and joins |
-| **DELETE**  | Remove Records | 🔄 Coming Soon | Delete specific rows based on conditions |
+| Command | Purpose | Status | Description |
+| --------------------------- | -------------- | ----------- | ------------------------------------------------------ |
+| **[SELECT](DML/SELECT.md)** | Query Data | ✅ Complete | Retrieve data with filtering, sorting, grouping, joins |
+| **[INSERT](DML/INSERT.md)** | Add Records | ✅ Complete | Add new rows with various data sources and methods |
+| **[UPDATE](DML/UPDATE.md)** | Modify Records | ✅ Complete | Change existing data with conditions and joins |
+| **[DELETE](DML/DELETE.md)** | Remove Records | ✅ Complete | Delete specific rows based on conditions |
 
 ### 🚀 Key Features Covered
 
 - **SELECT**: Complete query syntax, joins, subqueries, window functions, CTEs, performance optimization
 - **INSERT**: Single/multiple row insertion, bulk operations, conflict resolution, database-specific features
 - **UPDATE**: Conditional updates, joins, subqueries, CASE statements, audit trails
+- **DELETE**: Selective deletion, JOINs with DELETE, safety practices, vs TRUNCATE/DROP comparison
 
 ---
 
 ## 🔐 DCL Commands (Data Control Language)
 
 DCL commands control access permissions to database objects.
 
-### 🔄 Planned Commands
+### ✅ Available Commands
+
+| Command | Purpose | Status | Description |
+| --------------------------- | ------------------ | ----------- | ------------------------------------------------ |
+| **[GRANT](DCL/GRANT.md)** | Give Permissions | ✅ Complete | Grant database permissions to users and roles |
+| **[REVOKE](DCL/REVOKE.md)** | Remove Permissions | ✅ Complete | Remove database permissions from users and roles |
+
+### 🚀 Key Features Covered
 
-| Command | Purpose | Status | Description |
-| ---------- | ------------------ | -------------- | ------------------------------------------------ |
-| **GRANT** | Give Permissions | 🔄 Coming Soon | Grant database permissions to users and roles |
-| **REVOKE** | Remove Permissions | 🔄 Coming Soon | Remove database permissions from users and roles |
+- **GRANT**: Object-level, database-level, schema-level permissions, role-based access, security best practices
+- **REVOKE**: Permission removal, CASCADE vs RESTRICT, cleanup procedures, security maintenance
 
 ---
 
 ## 🔄 TCL Commands (Transaction Control Language)
 
 TCL commands manage database transactions and data consistency.
 
-### 🔄 Planned Commands
+### ✅ Available Commands
+
+| Command | Purpose | Status | Description |
+| --------------------------------- | -------------- | ----------- | -------------------------------------------------- |
+| **[COMMIT](TCL/COMMIT.md)** | Save Changes | ✅ Complete | Make transaction changes permanent |
+| **[ROLLBACK](TCL/ROLLBACK.md)** | Undo Changes | ✅ Complete | Revert transaction changes |
+| **[SAVEPOINT](TCL/SAVEPOINT.md)** | Set Checkpoint | ✅ Complete | Create transaction savepoints for partial rollback |
+
+### 🚀 Key Features Covered
 
-| Command | Purpose | Status | Description |
-| ------------- | -------------- | -------------- | -------------------------------------------------- |
-| **COMMIT** | Save Changes | 🔄 Coming Soon | Make transaction changes permanent |
-| **ROLLBACK** | Undo Changes | 🔄 Coming Soon | Revert transaction changes |
-| **SAVEPOINT** | Set Checkpoint | 🔄 Coming Soon | Create transaction savepoints for partial rollback |
+- **COMMIT**: Transaction management, commit modes, error handling, performance optimization
+- **ROLLBACK**: Error recovery, rollback scenarios, performance impact, recovery patterns
+- **SAVEPOINT**: Partial rollback control, complex transaction management, nested operations
 
 ---
 
@@ -184,14 +196,17 @@ DELETE FROM TableName WHERE ...;
 ### Phase 2: Structure Management (Intermediate)
 
 1. **[ALTER](DDL/ALTER.md)** - Modify table structures
-2. **[TRUNCATE](DDL/TRUNCATE.md)** - Efficiently remove data
-3. **[DROP](DDL/DROP.md)** - Safely remove objects
+2. **[DELETE](DML/DELETE.md)** - Selective data removal and safety practices
+3. **[TRUNCATE](DDL/TRUNCATE.md)** - Efficiently remove data
+4. **[DROP](DDL/DROP.md)** - Safely remove objects
 
 ### Phase 3: Advanced Operations (Advanced)
 
-1. **DELETE** - Selective data removal (Coming Soon)
-2. **GRANT/REVOKE** - Security management (Coming Soon)
-3. **Transaction Control** - Data consistency (Coming Soon)
+1. **[GRANT](DCL/GRANT.md)** - Security and permission management
+2. **[REVOKE](DCL/REVOKE.md)** - Permission removal and cleanup
+3. **[COMMIT](TCL/COMMIT.md)** - Transaction commitment and error handling
+4. **[ROLLBACK](TCL/ROLLBACK.md)** - Transaction rollback and recovery
+5. **[SAVEPOINT](TCL/SAVEPOINT.md)** - Complex transaction control
 
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