I need a SQL query for Oracle that select groups that contains the elements "ABC" and "ANQ".
...Более сложные запросы Объединение и группировка (GROUP_CONCAT) Группировка данных по нескольким полям Объединение таблиц (UNION) Средние значения, сгруппированные за каждый час Операторы IF и CASE Вставка
I had some tables on my database that have duplicate values, in order to get rid of those I made a small program that finds duplicates remove them and write new rows. By mistake, I commented the line that writes rows to database, and the only commands that were passed are the DELETE ones.
FIRST_ROWS (первая строка данных возвращается как можно скорее).
HASH partitioning is when a partition is selected based on the value returned by a user-defined expression that operates on column values in rows to be inserted into the table. The function may consist of any expression valid in SQL that yields a non-negative integer value.
Например, проверка логина и пароля, на PHP может иметь следующий вид
SELECT * FROM Employees WHERE PhoneNumber IN ( SELECT PhoneNumber FROM Employees GROUP BY PhoneNumber HAVING COUNT(Employee_ID) > 1 ).
SELECT COUNT(*) FROM queue.stat WHERE (dat_p>='2017-03-02') AND rez=1 GROUP BY idq ORDER BY idq
SELECT column_to_select FROM table_to_select WHERE certain_conditions_apply; Например, чтобы извлечь столбец name из таблицы dinners, нужен такой запрос: SELECT name FROM dinners; name - Dolly Etta Irma Barbara Gladys (5 rows).