1. » Marius
    I have SQL a query like this:
    SELECT c.type, SUM( u.account )
    FROM contracts c, u_data u
    WHERE c.user_id =
    GROUP BY c.type;
    Now this gives me...
    Last post » Admin
    You just have the wrong order for GROUP BY and ORDER BY.
    ORDER BY should be added after GROUP BY.
    GROUP BY c.type;
    ORDER BY FIELD( c.type,...

  2. » Marius
    I have an array in php:
    $arr = array(3, 'value 1', 'other value');
    And a mysql table with these columns: id | name | data
    I want to store...
    Last post » Admin
    You can store an array in a database into a string with JSON format.
    Use json_encode() when you want to insert the array. For example:...

  3. » Marius
    I'm trying to SELECT from a PHP array inside a mysql query.
    $sql = SELECT * FROM table WHERE id = $ids ;
    $ids has been created by $_POST and...
    Last post » Admin
    Try with IN with implode of the array $id like:
    $sql = SELECT * FROM table WHERE id IN ( . implode(',', $ids) . ) ;
    - Make sure that $ids is an...

  4. » Marius
    I've written following code to compare a date in a variable with today's date. If the date in a variable is greater than today's date the error...
    Last post » Admin
    You may be meaning 11th Decemeber with 12-11-2014, but strtotime isn't seeing it that way.
    If you need to use strtotime() then change the input...

  5. » Marius
    I have two tables: A and B. I need to compare their columns to get values of one table that are not in other table.
    Table A columns : ID,...
    Last post » Admin
    You can use not in :
    SELECT *
    FROM table_A
    WHERE table_id NOT IN (SELECT id from table_B)

  6. » Marius
    I have a subscription system in my website. When the users subscribe, their start date and time is added in mysql table using now() function.
    I also...
    Last post » Admin
    The date_add() function is what you're looking for:
    DATE_ADD(date,INTERVAL expr unit)
    INSERT INTO users
    (username, registration_date,...

  7. » Marius
    While executing an INSERT statement with many rows, I want to skip duplicate entries that would otherwise cause failure. After some research, my...
    Last post » Admin
    If you just want to skip rows with duplicate values, and no update needed, I think that is proper to use INSERT IGNORE .
    If you use INSERT...

  8. » Marius
    I have this Select query, I want to select one row from mysql table, where id = $id, and has x_name or y_name 'yes'.
    $insert_cat =...
    Last post » Admin
    The problem is that you didn't separate the conditions with the OR from the id=$id, so to select just the row which has that $id AND 'yes' in any...

  9. » Marius
    I have this array, and I want to return it as JSON from a PHP script.
    $ar = array(
    'k0'=> array('a', 'b', 'c'),
    'k1'=> array(1, 2, 3)
    Last post » MarPlo
    Use json_encode() to encode the data and set the content-type with header('Content-type: application/json');
    Anyway, it works fine if you just...

  10. » Marius
    I have two arrays $a1 and $a2 with various elements.
    How can I check which item from $a2 is in $a1? Is there any function, or I have to traverse...
    Last post » Admin
    The array_intersect($a2, $a1) function returns the elements of $a2 which are found in $a1.
    Also, with the in_array() function you can check if...

  11. » Marius
    I have 2 tables with same column names in my database which are supposed to provide content in 2 languages.
    This is how I query for one table (this...
    Last post » MarPlo
    The mysql is confused when you select columns with same name. The solution is to use Alias ( AS ).
    $sql = SELECT en.col1 AS c1en, en.col2 AS c2en,...

  12. » Marius
    Does anyone has a php code to display the elapsed time?
    Like: one hour ago, 1 day and 3 hours ago, ...
    Thank you.
    Last post » Admin
    You can use the timeElapsed() function, from this example:
    function timeElapsed($t1, $t2 = null) {

  13. » Marius
    Why in my database, time is of type Timestamp but has no numeric form: 1402008961, but is of the form: 07/25/2014 12:13:45 ?
    Last post » MarPlo
    Timestamp in MySQL is different from Unix Timestamp, which as you know is a number of seconds starting from 1970.
    Timestamp in MySQL is...