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|---|---|---|
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:relaxed: |
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😝 :stuck_out_tongue_closed_eyes: |
😀 :grinning: |
😗 :kissing: |
😙 :kissing_smiling_eyes: |
😛 :stuck_out_tongue: |
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Giả sử công ty ABC nào đó có 7 phòng ban: P01, P02, P03, P04, P05, P06, P07 với số lượng nhân viên tương ứng là: 54, 33, 18, 13, 8, 7, 3. Quy hoạch địa chỉ IP cho các phòng ban trên với giải địa chỉ là: 192.168.1.0/24.
Ta sẽ quy hoạch các giải địa chỉ ip cho các phòng ban có số lượng nhân viên nhiều nhất đến ít nhất.
| Hosts Needed | Hosts Available | Unused Hosts | Network Address | Mask | Usable Range | Broadcast |
|---|---|---|---|---|---|---|
| 54 | 62 | 8 | 192.168.1.0/26 | 255.255.255.192 | 192.168.1.1->192.168.1.62 | 192.168.1.63 |
| 33 | 62 | 29 | 192.168.1.64/26 | 255.255.255.192 | 192.168.1.65->192.168.1.126 | 192.168.1.127 |
| 18 | 30 | 12 | 192.168.1.128/27 | 255.255.255.224 | 192.168.1.129->192.168.1.158 | 192.168.1.159 |
| 13 | 14 | 1 | 192.168.1.160/28 | 255.255.255.240 | 192.168.1.161->192.168.1.174 | 192.168.1.175 |
| 8 | 14 | 6 | 192.168.1.176/28 | 255.255.255.240 | 192.168.1.177->192.168.1.190 | 192.168.1.191 |
| 7 | 14 | 7 | 192.168.1.192/28 | 255.255.255.240 | 192.168.1.193->192.168.1.206 | 192.168.1.207 |
| 3 | 6 | 3 | 192.168.1.208/29 | 255.255.255.248 | 192.168.1.209->192.168.1.214 | 192.168.1.215 |
| <activity android:name=".DisplayMessageActivity" | |
| android:parentActivityName=".MainActivity"> | |
| <!-- The meta-data tag is required if you support API level 15 and lower --> | |
| <meta-data | |
| android:name="android.support.PARENT_ACTIVITY" | |
| android:value=".MainActivity" /> | |
| </activity> |
| package org.sqlite; | |
| import java.sql.SQLException; | |
| public enum SQLiteErrorCode { | |
| UNKNOWN_ERROR(-1, "unknown error"), | |
| SQLITE_OK(0, "Successful result"), | |
| /* beginning-of-error-codes */ | |
| SQLITE_ERROR(1, "SQL error or missing database"), |
| BEGIN | |
| IF((SELECT CURDATE()) > (SELECT date_to_exist FROM class WHERE NEW.register_class_id = class_id)) | |
| THEN | |
| SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Đã hết thời gian đăng kí lớp!'; | |
| END IF; | |
| IF((SELECT total_registered FROM class WHERE NEW.register_class_id = class_id) >= (SELECT max_register FROM class WHERE NEW.register_class_id = class_id)) | |
| THEN | |
| SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Đã hết chỗ đăng kí lớp!'; | |
| // RAISE (ABORT, 'message'); |
| BEGIN | |
| UPDATE class SET max_register = total_registered - 1 | |
| WHERE class.class_id = OLD.register_class_id; | |
| END |
| BEGIN | |
| IF((NEW.start_time - NEW.end_time) >= 0) | |
| THEN | |
| SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Thời gian lớp học không hợp lệ!'; | |
| END IF; | |
| END |
| BEGIN | |
| IF((SELECT max_register FROM class WHERE class_id = OLD.class_id) >= 20) THEN | |
| SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'lớp đã có đủ tối thiểu 20 sinh viên!'; | |
| END IF; | |
| END |
