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║     QUICK START: Assign Same Subject to Multiple Groups          ║
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✅ PROBLEM SOLVED!
You can now assign the same subject (e.g., Math, English) to different
groups (Science, Commerce, Arts) in the same class.

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📋 STEP-BY-STEP INSTRUCTIONS

OPTION A: Assign to ALL Groups at Once (Recommended for common subjects)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

1. Go to: http://localhost/bidda/subjects/assign_by_class.php

2. Select:
   ┌─────────────────────────────────────────────┐
   │ সেশন:  [2024-2025 ▼]                       │
   │ ক্লাস:  [Class 9 ▼]                        │
   │ গ্রুপ:  [সব গ্রুপ ▼]  (leave as is)        │
   │ [লোড] ← Click this                          │
   └─────────────────────────────────────────────┘

3. You'll see a NEW checkbox:
   ┌─────────────────────────────────────────────┐
   │ ☑ সকল গ্রুপে প্রয়োগ করুন                  │
   │   (Apply to All Groups)                     │
   │   নির্বাচিত সাবজেক্টগুলো সকল সক্রিয়      │
   │   গ্রুপে একসাথে সেট হবে                    │
   └─────────────────────────────────────────────┘

4. Check the subjects you want:
   ☑ Bengali (বাংলা)
   ☑ English (ইংরেজি)
   ☑ Mathematics (গণিত)
   ☑ Religion (ধর্ম)

5. ☑ CHECK the "সকল গ্রুপে প্রয়োগ করুন" box

6. Click [সংরক্ষণ করুন] (Save)

7. Confirm when asked

✅ RESULT: All selected subjects are now assigned to ALL groups
   (Science, Commerce, Arts) in Class 9!

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

OPTION B: Assign to One Group at a Time (For specific subjects)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

For Science Group:
1. Select: Class 9, Group: Science
2. Check: Physics, Chemistry, Biology
3. DON'T check "Apply to All Groups"
4. Save

For Commerce Group:
1. Select: Class 9, Group: Commerce  
2. Check: Accounting, Business Studies
3. DON'T check "Apply to All Groups"
4. Save

✅ RESULT: Different subjects for different groups!

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⚠️  IMPORTANT: Database Fix Required (One-time setup)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

If you see an error or the feature doesn't work:

1. Open phpMyAdmin: http://localhost/phpmyadmin
2. Select database: bidda
3. Click "SQL" tab
4. Copy and paste the SQL from: fix_database_structure.sql
5. Click "Go"

That's it! The database is now fixed.

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📊 WHAT'S NEW IN THE INTERFACE?

Before:                          After:
┌─────────────────────────┐    ┌─────────────────────────────────┐
│ ক্লাস: [Class 9 ▼]     │    │ ক্লাস: [Class 9 ▼]             │
│ গ্রুপ: [Science ▼]      │    │ গ্রুপ: [Science ▼]              │
│ [লোড]                   │    │ [লোড]                           │
│                          │    │                                 │
│ ☐ Subject 1              │    │ ☑ সকল গ্রুপে প্রয়োগ করুন ← NEW!│
│ ☐ Subject 2              │    │                                 │
│ ☐ Subject 3              │    │ ☐ Subject 1                     │
│                          │    │ ☐ Subject 2                     │
│ [সংরক্ষণ করুন]          │    │ ☐ Subject 3                     │
│                          │    │                                 │
│ Could only save to       │    │ [সংরক্ষণ করুন]                 │
│ Science group            │    │                                 │
└─────────────────────────┘    │ Can save to ALL groups!         │
                                └─────────────────────────────────┘

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💡 PRO TIPS

Tip 1: Mix and Match
------
- First, assign common subjects to ALL groups
- Then, add group-specific subjects one by one

Example:
Step 1: Assign Bengali, English to ALL groups ✓
Step 2: Add Physics to Science only
Step 3: Add Accounting to Commerce only

Tip 2: Check Before Saving
------
The "সকল গ্রুপে প্রয়োগ করুন" checkbox will ask for confirmation
to prevent accidents. Read it carefully!

Tip 3: Verify Your Work
------
After saving, load each group separately to verify the subjects
were assigned correctly.

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🔧 TROUBLESHOOTING

Problem: "Duplicate entry" error
Solution: Run the fix_database_structure.sql script

Problem: Checkbox doesn't appear
Solution: Clear browser cache (Ctrl+F5) and reload

Problem: Can't see some subjects
Solution: Check if subjects are marked as "active" in the 
          subjects table

Problem: Changes not saving
Solution: Check browser console (F12) for JavaScript errors

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📞 NEED MORE HELP?

1. Read: SUBJECT_ASSIGNMENT_GUIDE.txt (detailed examples)
2. Read: CHANGES_SUMMARY.md (technical details)
3. Check database: http://localhost/bidda/check_db.php
4. Contact system administrator

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✅ YOU'RE READY TO GO!

Visit: http://localhost/bidda/subjects/assign_by_class.php

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