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SELECT u.id, u.name, o.id as order_id, o.amount FROM users u ? JOIN orders o ON u.id = o.user_id;
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AIdan javob
Ushbu SQL so'rovida jadvalni birlashtirish turini belgilovchi kalit so'z yo'q. Agar faqat buyurtmalari bo'lgan foydalanuvchilarni olishni istasangiz, INNER JOIN ishlatiladi:
SELECT u.id, u.name, o.id as order_id, o.amount
FROM users u
INNER JOIN orders o ON u.id = o.user_id;
Agar barcha foydalanuvchilar, jumladan buyurtmasi bo'lmaganlar ham bo'lsa, LEFT JOIN mos keladi:
SELECT u.id, u.name, o.id as order_id, o.amount
FROM users u
LEFT JOIN orders o ON u.id = o.user_id;
Shuning uchun, ? o'rniga JOIN turini, masalan, INNER yoki LEFT ni qo'yish kerak.