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Aug 27, 2025
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Update commands/README.md to reflect completion of all SQL commands #4

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71 changes: 43 additions & 28 deletions commands/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -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
```

---
Expand Down Expand Up @@ -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

---

Expand Down Expand Up @@ -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

---

Expand Down