How to export mysql query results to csv?

To Learn OR understand the exporting mysql results in CSV.
Lets have below simple example.

1. Step 1: Create a employee table
   

   CREATE TABLE IF NOT EXISTS `employee` (
     `id` int(11) unsigned NOT NULL,
     `first_name` varchar(100) DEFAULT NULL,
     `last_name` varchar(100) DEFAULT NULL,
     `gender` enum('m','f') DEFAULT NULL,
     `status` enum('0','1') NOT NULL COMMENT '0-Inactive, 1-Active',
     `address` varchar(255) DEFAULT NULL,
     `created_at` datetime DEFAULT NULL,
     `modified_at` datetime DEFAULT NULL
   ) ENGINE=InnoDB AUTO_INCREMENT=6;

   
   
2. Add The records in employee table

   INSERT INTO `employee` (`id`, `first_name`, `last_name`, `gender`, `status`, `address`, `created_at`, `modified_at`) VALUES
   (1, 'Sunil', 'Malhotra', 'm', '1', '3020 new town, chandigarh', '2015-09-02 12:38:00', '2015-09-02 12:38:00'),
   (2, 'Anil ', 'Yadav', 'm', '1', '3020 new town, chandigarh', '2015-09-02 12:38:00', '2015-09-02 12:38:00'),
   (3, 'Aman ', 'Verma', 'm', '1', '3020 new town, chandigarh', '2015-09-02 12:38:00', '2015-09-02 12:38:00'),
   (4, 'Ram ', 'Singh', 'm', '1', '3020 new town, chandigarh', '2015-09-02 12:38:00', '2015-09-02 12:38:00'),
   (5, 'Arun', 'Kumar', 'm', '1', '3020 new town, chandigarh', '2015-09-02 12:38:00', '2015-09-02 12:38:00');
   

   
   
3. Create a folder where you are going to export the csv file.
   
4. Execute the Mysql Query.

   SELECT id,first_name,last_name,gender, STATUS, address FROM employee
   INTO OUTFILE 'E:/wamp/www/export/employee3.csv' FIELDS TERMINATED BY ',' ENCLOSED BY '"'
   LINES TERMINATED BY '\n';

   
   

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MySql replace NULL values with empty string without effecting Rowset

Question: What is NULL Value in MySQL?
NULL values means don't have any value. It is neither empty NOR it have any value.


Question: Give an Example which is give NULL Values in Query?
NULL values means don't have any value. It is neither empty NOR it have any values.

SELECT u.id, u.first_name,u.last_name,b.address1 FROM `users` as u LEFT JOIN billings as b on b.user_id=u.id order by u.id desc limit 5;

See Screenshot below:

Question: How we can replace the null value with empty string?
We can use mysql IFNULL function to replace the null values with empty string. See Example:

SELECT IFNULL(null,"") as value 

Question: Give an Example to replace the NULL with empty string in mysql query?
We can use mysql IFNULL function to replace the null values with empty string. See Example:

SELECT u.id, u.first_name,u.last_name,IFNULL(b.address1,"") AS address1 FROM `users` as u LEFT JOIN billings as b on b.user_id=u.id  order by u.id desc limit 5; 

See Screenhot below:

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