Fatal Error: Uncaught Exception 'Mysqli_Sql_Exception' with Message 'No Index Used in Query/Prepared Statement'

Fatal error: Uncaught exception 'mysqli_sql_exception' with message 'No index used in query/prepared statement'

Take a look at this bug-report : #35450 mysqli extension reports too many warnings

Quoting a few sentences of a note :

Mysqli extension throws too many
warnings.
For example, "SELECT *
FROM table" results in a warning:
"Warning: mysqli::query(): No index
used in query/prepared statement
SELECT * FROM table ..."

And, quoting another note, which seems interesting :

Use mysqli_report() to disable that.

Fatal error: Uncaught mysqli_sql_exception: No index used in query/prepared statement SELECT * FROM Product

Your Product table has no column indexed, you should fix it for better performance

You can always disable this mysqli error just by adding this code

mysqli_report(MYSQLI_REPORT_INDEX);

You can find here the complet list about Enabling/Disabling the internal report functions

I suggest you to read this good article about PHP & MYSQL Communication

No index used in query/prepared statement when updating columns

Try commenting out mysqli_report(MYSQLI_REPORT_ALL); as there are instances of it reporting too many errors, and it may be causing your code to not execute fully.

Fatal error: Uncaught exception 'mysqli_sql_exception' with message

Fatal error: Uncaught exception 'mysqli_sql_exception' with message Table 'fyp.biding' doesn't exist' in

This is as clear an error message as you'll ever get. The table biding doesn't exists. It may be a typo in the name or your haven't created it.

PHP (v5.6) Error Uncaught exception 'mysqli_sql_exception' with message 'Access denied for user

Well I found the solution. All I had to do was to change from

$_POST[idk]

to

$_POST['idk']

Credits: Taavi Tiitsu

Then I had to delete the last 3 lines, in my case

$stmt->close(); $con->close(); ?>

You only should close PHP if you are going to write some HTML
immediately after. Other than that your PHP files should never end in

Credits: Dharman

And the last mistake was not adding the fourth parameter inside connection function (database name).

$mysqli = new mysqli($servername, $username, $password, $dbname);

You forgot to set the fourth parameter in new mysqli.

That page you linked has a $dbname variable which you are missing in

Credits: brombeer, Dharman

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