SELECT DEFAULT returns NULL - mysql

Question

I want to return two defaults column values even if the table has no records. I'm using the following query (thanks to How to SELECT DEFAULT value of a field):
SELECT DEFAULT(membership_credits) AS membership_credits,
DEFAULT(product_credits) AS product_credits
FROM (SELECT 1) AS dummy LEFT JOIN Users ON True LIMIT 1
But instead of the default values, I'm getting NULL:
membership_credits product_credits
NULL NULL
What's the problem?
EDIT:
Adding the table schema as suggested in a comment:
CREATE TABLE Users (
user_id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
user_login VARCHAR(40) NOT NULL UNIQUE,
user_name VARCHAR(100) NOT NULL,
user_email VARCHAR(254) NOT NULL UNIQUE,
user_telephone VARCHAR(100) NOT NULL,
user_password VARCHAR(64) NOT NULL,
user_address VARCHAR(255) NOT NULL,
user_postal_code VARCHAR(100) NOT NULL,
user_district VARCHAR(100) NOT NULL,
user_country VARCHAR(100) NOT NULL,
user_tax_number VARCHAR(20) NOT NULL,
user_billing_email VARCHAR(254) NOT NULL,
company_description TEXT,
company_history TEXT,
company_products TEXT,
public_contact BINARY(1) NOT NULL,
user_active BINARY(1) NOT NULL DEFAULT '0',
user_key VARCHAR(255) NOT NULL,
user_registered TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
unread_messages INT UNSIGNED DEFAULT 0,
membership_credits INT UNSIGNED NOT NULL DEFAULT 0,
product_credits INT UNSIGNED NOT NULL DEFAULT 0
) ENGINE INNODB CHARACTER SET utf8 COLLATE utf8_general_ci;

Answer 1

It all depends on if your columns allow NULL or not.
If NULL allow, a query like the following will be useful, so the table does not have records:
SELECT
DEFAULT(`membership_credits`) `membership_credits`,
DEFAULT(`product_credits`) `product_credits`
FROM (SELECT 1) `dummy`
LEFT JOIN `users` ON TRUE
LIMIT 1;
SQL Fiddle demo
If not allow NULL, and the table has no record, you will get a NULL to the query above. In this case would require a query like:
SELECT
DEFAULT(`membership_credits`) `membership_credits`,
DEFAULT(`product_credits`) `product_credits`
FROM (SELECT *, COUNT(0)
FROM `users`) `users`;
SQL Fiddle demo
UPDATE
Be careful in MySQL >= 5.6 does not operate in the same way and NULL values ​​are obtained.
SQL Fiddle demo

Answer 2

Try this Query
SELECT COLUMN_DEFAULT FROM information_schema.columns
WHERE TABLE_SCHEMA = 'your_database_name' AND
TABLE_NAME = 'your_table_name' AND COLUMN_NAME = 'your_column_name';
In Your case
SELECT COLUMN_DEFAULT FROM information_schema.columns
WHERE TABLE_SCHEMA = 'test' AND
TABLE_NAME = 'users' AND
COLUMN_NAME in ('membership_credits','product_credits');

Answer 3

if you use following query to create table
CREATE TABLE `users` (
`user_id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
`user_login` VARCHAR(40) NOT NULL,
`user_name` VARCHAR(100) NOT NULL,
`user_email` VARCHAR(254) NOT NULL,
`user_telephone` VARCHAR(100) NOT NULL,
`user_password` VARCHAR(64) NOT NULL,
`user_address` VARCHAR(255) NOT NULL,
`user_postal_code` VARCHAR(100) NOT NULL,
`user_district` VARCHAR(100) NOT NULL,
`user_country` VARCHAR(100) NOT NULL,
`user_tax_number` VARCHAR(20) NOT NULL,
`user_billing_email` VARCHAR(254) NOT NULL,
`company_description` TEXT NULL,
`company_history` TEXT NULL,
`company_products` TEXT NULL,
`public_contact` BINARY(1) NOT NULL,
`user_active` BINARY(1) NOT NULL DEFAULT '0',
`user_key` VARCHAR(255) NOT NULL,
`user_registered` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
`unread_messages` INT(10) UNSIGNED NULL DEFAULT '0',
`membership_credits` INT(10) UNSIGNED NULL DEFAULT '0',
`product_credits` INT(10) UNSIGNED NULL DEFAULT '0',
PRIMARY KEY (`user_id`),
UNIQUE INDEX `user_login` (`user_login`),
UNIQUE INDEX `user_email` (`user_email`)
)
And use below query to get default values
SELECT if(DEFAULT(membership_credits) is null,0,
DEFAULT(membership_credits))AS membership_credits,if(DEFAULT(product_credits)
is null,0,DEFAULT(product_credits) )AS product_credits FROM
(SELECT 1) AS dummy LEFT JOIN Users ON True LIMIT 1
You must note that in the above create query membership_credits and product_credits modified to allow null

Answer 4

Use below query :
SELECT
IF(COUNT(user_id) = 0,
DEFAULT( membership_credits),
membership_credits) AS membership_credits,
IF(COUNT(user_id) = 0,
DEFAULT( product_credits),
product_credits) AS product_credits FROM
(SELECT 1) AS dummy LEFT JOIN
Users ON TRUE

Answer 5

Use the below query :
SELECT
IF(COUNT(user_id) = 0,
DEFAULT( membership_credits),
membership_credits) AS membership_credits,
IF(COUNT(user_id) = 0,
DEFAULT( product_credits),
product_credits) AS product_credits
FROM
(SELECT 1) AS dummy
LEFT JOIN
Users ON TRUE