SQL, bases de données, etc

mysql -u {username} -p {databasename} < file_name.sql

http://stackoverflow.com/questions/6163694/how-do-you-use-mysqls-source-command-to-import-large-files-in-windows

!SO Bof !SO OK

SHOW TABLES LIKE 'yourtable';

http://sql.sh/cours/jointures http://sql.sh/cours/jointures/natural-join

SELECT zed_customer.id_customer,
             CASE WHEN zed_customer_group.id_group = 4 
                     THEN 1 
                     ELSE 0 
             END AS profil_valide
FROM zed_customer
LEFT JOIN zed_customer_group ON zed_customer.id_customer = zed_customer_group.id_customer

Sachant qu'il y a des multiples entrées par id_customer mais ne veut que le dernier. On s'aide de GROUP BY pour ça.

SELECT zed_customer.id_customer, MAX(zed_projet_acces.dossier_investissement) AS dossier_investissement, MAX(zed_projet_acces.documents) AS documents
FROM zed_customer
LEFT JOIN zed_projet_acces ON zed_customer.id_customer = zed_projet_acces.id_customer
GROUP BY zed_customer.id_customer

Comment imbriquer des SELECT.

SELECT a.id_customer, a.id_parrain, b.nb_filleuils
FROM zed_customer AS a
LEFT OUTER JOIN (SELECT id_parrain, COUNT(id_parrain) AS nb_filleuils
FROM zed_customer
GROUP BY id_parrain)
AS b ON a.id_customer = b.id_parrain
GROUP BY a.id_customer

Référence

DELETE FROM table_name
WHERE condition;

On peut utiliser LIKE comme une condition :

SELECT * FROM submission WHERE title LIKE '%gladiator%'
// Delete the lines
DELETE FROM submission WHERE title LIKE '%gladiator%' OR title LIKE '%tournament%'

NOW() DATE_ADD()

// Récupérer le datetime d'il y a 1 heure
DATE_ADD( NOW(), INTERVAL -1 HOUR )

Sauce
LIMIT : limite le nombre de résultat total
OFFSET : nombre d'entrée à sauter dans les résultats