Specifies a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a function such as NOW() or CURRENT_DATE. The exception is that you can specify CURRENT_TIMESTAMP as the default for a TIMESTAMP or DATETIME column.https://dev.mysql.com/doc/refman/5.7/en/create-tab...
SELECT
*
FROM
`dle_post`
JOIN
`dle_post_extras` ON `dle_post_extras`.id = `dle_post`.id