Fix MySQL Error: ‘Unknown Column’ – Sababu ya Kosa na Jinsi ya Kurekebisha

Error “Unknown Column … in field list” hutokea MySQL inapopokea query ambayo inataja column ambayo haipo kwenye table. Hili ni tatizo linalowapata wanaoandika PHP + MySQL systems za shule, sales, login, au mifumo mingine kama Excel Systems zinazopatikana Faulink 👉 https://www.faulink.com/excel_mifumo.php

Katika makala hii utaona:

Sababu kuu za error

Jinsi ya kuirekebisha

Maelezo ya code

Example queries sahihi na mbovu

Mwongozo kwa XAMPP, CPanel, na hosting

1. Sababu Kuu za Error “Unknown Column”
🔹 1. Column unayotumia haipo kwenye table

Mfano query:

SELECT jina FROM students;


Lakini column inayoitwa jina haipo.

Hii hutokea sana pale unapo-copy code kutoka tutorials kama hizi
👉 https://faulink.com/code_register_login.php

halafu database yako ina column tofauti.

🔹 2. Column ipo lakini umeikosea jina (Spelling mistake)

Mfano:

username badala ya user_name

data badala ya date

passwrod badala ya password

Hili ni kosa la kawaida sana kwa wanaoanza kujifunza MySQL kupitia guides kama za Faulink 👉 https://www.faulink.com/

🔹 3. Unatumia backticks au quotes vibaya

Mfano mbaya:

SELECT `name FROM users;

🔹 4. Column ipo lakini haipo kwenye table unalotumia

Mfano:

SELECT amount FROM sales_2023;


Lakini column amount ipo kwenye table sales, sio sales_2023.

🔹 5. Ume-update database lakini code za PHP hazijabadilishwa

Mfano:

Umeongeza column mpya

Umefuta column

Umekuwa na table mpya

Lakini code ya PHP bado inataja column ya zamani.

Restoring files za database kwa usahihi unaweza kujifunza kupitia systems tutorials kama hizi:
👉 https://www.faulink.com/excel_mifumo.php

2. Jinsi ya Kutatua Error (SOLUTIONS)
✔ Solution 1: Hakikisha column ipo kwenye table (SHOW COLUMNS)

Kimbiza command hii:

SHOW COLUMNS FROM your_table;


Mfano:

SHOW COLUMNS FROM users;


Hapa utaona kama column unayotumia ipo kweli.

✔ Solution 2: Angalia spelling ya column kwenye query

Mfano kosa:

SELECT usernme FROM users;


Sahihi:

SELECT username FROM users;

✔ Solution 3: Hakikisha una-insert kwenye columns zilizopo

Mfano kosa:

INSERT INTO users (fullname, email, pass)
VALUES ('Juma', 'juma@example.com', '12345');


Lakini column ya pass haipo.

Sahihi:

INSERT INTO users (fullname, email, password)
VALUES ('Juma', 'juma@example.com', '12345');

✔ Solution 4: Usiweke quotes vibaya kwenye column

Mfano mbaya:

SELECT 'name' FROM users;


Hii MySQL itafikiri ‘name’ ni string, si column.

Sahihi:

SELECT name FROM users;

✔ Solution 5: Hakikisha code ya PHP inaendana na database

Mfano wa common mistake kwenye login systems (kama ile ya Faulink 👉 https://faulink.com/code_register_login.php
):

Kosa:

$sql = "SELECT * FROM users WHERE user_name='$username'";


Lakini column yako inaitwa username.

Sahihi:

$sql = "SELECT * FROM users WHERE username='$username'";

✔ Solution 6: Angalia table unalotumia kama ni sahihi

Mfano kosa:

SELECT price FROM products_backup;


Lakini products_backup haina column price.

Sahihi kutumia:

SELECT price FROM products;

✔ Solution 7: Rudisha column iliyofutwa (kama uli-delete kwa bahati mbaya)

Ongeza column:

ALTER TABLE users ADD COLUMN fullname VARCHAR(255);


Au kama una backup, restore kupitia phpMyAdmin.

Mwongozo wa backup upo kwenye tutorials za Excel Systems:
👉 https://www.faulink.com/excel_mifumo.php

3. PHP Error Example

Mfano wa error unayotumia:

Unknown column 'emailaddress' in 'field list'


Hii inamaanisha: column emailaddress haipo.

Solution:

Angalia kwenye DB kama column ipo

Badilisha query yako kuwa kama hii:

$sql = "SELECT email FROM users";

4. Example Kamili – Fixing Insert Query

Kosa:

$sql = "INSERT INTO students (name, class, stream)
VALUES ('$name', '$class', '$strem')";


Column strem haipo.

Fix:

$sql = "INSERT INTO students (name, class, stream)
VALUES ('$name', '$class', '$stream')";

5. Hitimisho

Error “Unknown Column” hutokea kwa sababu:

Column haipo

Column imekosewa spelling

Unatumia table mbaya

Ume-update database lakini code haijarekebishwa

Ufumbuzi wake ni rahisi:
Angalia column, angalia spelling, na rekebisha query.

Kwa kujifunza zaidi kuhusu PHP + MySQL Systems, unaweza kutembelea:

🌐 Faulink Systems Tutorials
👉 https://www.faulink.com/

📘 Excel Systems (Database Guides)
👉 https://www.faulink.com/excel_mifumo.php

🧩 Sample za Login/Register (Mzuri kwa wanaoanza)
👉 https://faulink.com/code_register_login.php

Ikiwa unahitaji msaada wa haraka kurekebisha error yoyote, unaweza kuwasiliana:
📲 https://wa.me/255693118509