
Тест_БД
Authored by Юрий Шалухин
Computers
Professional Development
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25 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Имеются элементы запроса: 1. SELECT employees.name, departments.name; 2. ON employees.department_id=departments.id; 3. FROM employees; 4. LEFT JOIN departments. В каком порядке их нужно расположить, чтобы выполнить поиск имен всех работников со всех отделов?
1,4,2,3
1,2,4,3
1,3,4,2
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Как расшифровывается SQL?
structured query language
strict question line
strong question language
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Для создания новой таблицы в существующей базе данных используют команду:
NEW TABLE
CREATE TABLE
MAKE TABLE
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Запрос для выборки всех значений из таблицы «Persons» имеет вид:
SELECT ALL Persons
SELECT * FROM Persons
SELECT .[Persons]
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Какое выражение используется для возврата только разных значений?
SELECT DISCINCT
SELECT DIFFERENT
SELECT UNIQUE
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Для подсчета количества записей в таблице «Persons» используется команда:
COUNT ROW IN Persons
SELECT COUNT(*) FROM Persons
SELECT ROWS FROM Persons
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Наиболее распространенным является тип объединения:
INNER JOIN
FULL JOIN
LEFT JOIN
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