ohne verbinden mit und Vereinigung

Question

Ich habe die folgende SQL-Abfrage:

SELECT t1.id as id, 
     t1.username as username, 
     CONCAT_WS(' ', t2.ad,t2.soyad) as fullname, 
     t2.title as title, 
     t3.pass as password, 
     t3.phone_login as hat, 
     t2.time as date 
FROM kullanici t1, kullanici_tanim t2, dial_users t3 
WHERE t1.id = t2.usr_id AND t1.agent_id = t3.user_id 
GROUP BY t1.id 
ORDER BY t1.id ASC 

Diese Abfrage funktioniert gut. Was ich frage mich ist, sollte ich Joins verwenden? Was ist der richtige Weg?

Answer 1

Verwenden Sie für ANSI-92-compliant code Joins. Zum Beispiel:

SELECT t1.id as id, 
      t1.username as username, 
      CONCAT_WS(' ', t2.ad,t2.soyad) as fullname, 
      t2.title as title, 
      t3.pass as password, 
      t3.phone_login as hat, 
      t2.time as date 
FROM kullanici t1 
    INNER JOIN kullanici_tanim t2 
    ON t1.id = t2.usr_id 
    INNER JOIN dial_users t3 
    ON t1.agent_id = t3.user_id 
GROUP BY t1.id 
ORDER BY t1.id ASC