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Asked: 2026-05-30T12:51:12+00:00

I have two tables: candidate_register_table with the following schema: |—————————————————-| | username | name

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I have two tables:

candidate_register_table with the following schema:

|----------------------------------------------------|
|   username  |  name   |  age   | sex   | password  |
|----------------------------------------------------|

candidate_social_table with the following schema

|--------------------------------------------------------|
|   username  |  religion   | caste  | address   | city  |
|--------------------------------------------------------|

In both tables, username are primary keys in their corresponding table.

I want to insert data in both the table in a single click event, where the username in table candidate_register_table is a foreign key in candidate_social_table also

This is my reg_conn.php where the data are getting inserted:

<?php
include('connection.php')'

$sql_register="INSERT INTO candidate_register_table (username, name, age, sex, password) )           VALUES('$_POST[username]','$_POST[name]','$_POST[age]', '$_POST[sex]','$_POST[password]')";
$sql_social_disable="ALTER TABLE candidate_social_table disable CONSTRAINT fk_candidate_register_table";
$sql_social="INSERT INTO candidate_social_table (username) VALUES('$_POST[username]')";
$sql_social_enable="ALTER TABLE candidate_social_table enable CONSTRAINT fk_candidate_register_table";

if(mysql_query($sql_register,$con) && mysql_query($sql_social_disable,$con) && mysql_query($sql_social,$con)  && mysql_query($sql_social_enable,$con))
   { echo "you have been registered";
   }
else
   {
       die('Error: ' . mysql_error());
       echo "Something went wrong. Might be a Fatal Error";
   }
?>

Now the problem is that, my connection and all others are all working perfectly, but the query: 

ALTER TABLE candidate_social_table disable CONSTRAINT fk_candidate_register_table`

Is not getting executed, its throwing the following error:

Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CONSTRAINT fk_t1' at line 1
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1 Answer

  1. Editorial Team

    I’m not sure if you can disable a constraint for a single table, or why you need to disable the foreign key in the first place since you are inserting your data in the correct order – but you can try:

    $sql_social_disable="SET FOREIGN_KEY_CHECKS=0";

    to re-enable, use

    $sql_social_disable="SET FOREIGN_KEY_CHECKS=1";

    Alternatively, you can drop the specific foreign key constraint, then recreate it when you are done.

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