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WHERE provisions channel different articulations, for example, SELECT, UPDATE, DELETE, and INSERT. They present rules used to determine activity. They regularly show up after a table name in an articulation, and their condition follows. The WHERE provision basically works like an if explanation.

Audit the overall punctuation of WHERE condition given beneath −

[COMMAND] field,field2,... FROM table_name,table_name2,... WHERE [CONDITION]

Note the accompanying characteristics of the WHERE condition −

• It is discretionary.
• It permits any condition to be determined.
• It takes into account the determination of numerous conditions through utilizing an AND OR administrator.
• Case affectability just applies to explanations utilizing LIKE examinations.

The WHERE condition allows the utilization of the accompanying administrators −

Operator
= !=
> <
>= <=

WHERE conditions can be used at the order brief or inside a PHP content.

The Command Prompt

At the order brief, basically utilize a standard order −

root@host# mysql -u root -p password;
Enter password:*******
mysql> use PRODUCTS;
Database changed
mysql> SELECT * from products_tbl WHERE product_manufacturer = 'XYZ Corp';
+-------------+----------------+----------------------+
| ID_number   | Nomenclature   | product_manufacturer |
+-------------+----------------+----------------------+
| 12345       | Orbitron 4000  | XYZ Corp             |
+-------------+----------------+----------------------+
| 12346       | Orbitron 3000  | XYZ Corp             |
+-------------+----------------+----------------------+
| 12347       | Orbitron 1000  | XYZ Corp             |
+-------------+----------------+----------------------+

Audit a model utilizing the AND condition −

SELECT *
FROM products_tbl
WHERE product_name = 'Bun Janshu 3000';
AND product_id <= 344;

This model joins both and additionally conditions

SELECT *
FROM products_tbl
WHERE (product_name = 'Bun Janshu 3000' AND product_id < 344)
OR (product_name = 'Bun Janshu 3000');

PHP Scripts Using Where Clause

Utilize the mysql_query() work in activities utilizing a WHERE proviso −

<?php
   $dbhost = 'localhost:3036';
   $dbuser = 'root';
   $dbpass = 'rootpassword';
   $conn = mysql_connect($dbhost, $dbuser, $dbpass);
   
   if(! $conn ) {
      die('Could not connect: ' . mysql_error());
   }

   $sql = 'SELECT product_id, product_name, product_manufacturer, ship_date
      FROM products_tbl
      WHERE product_manufacturer = "XYZ Corp"';
   
   mysql_select_db('PRODUCTS');
   $retval = mysql_query( $sql, $conn );
   
   if(! $retval ) {
      die('Could not get data: ' . mysql_error());
   }

   while($row = mysql_fetch_array($retval, MYSQL_ASSOC)) {
      echo "Product ID :{$row['product_id']} <br> ".
         "Name: {$row['product_name']} <br> ".
         "Manufacturer: {$row['product_manufacturer']} <br> ".
         "Ship Date: {$row['ship_date']} <br> ".
         "--------------------------------<br>";
   }

   echo "Fetched data successfully\n";
   mysql_close($conn);
?>

On effective information recovery, you will see the accompanying yield −

Product ID: 12345
Nomenclature: Orbitron 4000
Manufacturer: XYZ Corp
Ship Date: 01/01/17
----------------------------------------------
Product ID: 12346
Nomenclature: Orbitron 3000
Manufacturer: XYZ Corp
Ship Date: 01/02/17
----------------------------------------------
Product ID: 12347
Nomenclature: Orbitron 1000
Manufacturer: XYZ Corp
Ship Date: 01/02/17
----------------------------------------------
mysql> Fetched data successfully