Виталий Витренко

SELECT text, count(*) as 'A' 
FROM all_queries
WHERE dates > LAST_DAY(CURDATE()) + INTERVAL 1 DAY - INTERVAL 1 MONTH
AND dates < DATE_ADD(LAST_DAY(CURDATE()), INTERVAL 1 DAY)
group by text
HAVING text in ('Привет','Хэллоу','Здравствуйте')
ORDER BY A desc

SELECT MAX(updated_at) FROM 
(SELECT t1.updated_at FROM t1 
UNION ALL 
SELECT t2.updated_at from t2 
UNION ALL 
SELECT t3.updated_at from t3) as t;

UPDATE dle_post SET category
category = CONCAT(category,',1')
WHERE category NOT LIKE '%2%';

SELECT  usd_sell , usd_byu , eur_sell , eur_buy FROM table1
GROUP BY usd_sell , usd_byu , eur_sell , eur_buy;