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Description: Вопросы и ответы к интервью Java разработчика. Contribute to trykopa/java-interview development by creating an account on GitHub.

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https://github.com/trykopa/java-interview/blob/master/sql.md#sql
Что такое «SQL»?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-sql
Какие существуют операторы SQL?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9A%D0%B0%D0%BA%D0%B8%D0%B5-%D1%81%D1%83%D1%89%D0%B5%D1%81%D1%82%D0%B2%D1%83%D1%8E%D1%82-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D1%8B-sql
Что означает NULL в SQL?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D0%BE%D0%B7%D0%BD%D0%B0%D1%87%D0%B0%D0%B5%D1%82-null-%D0%B2-sql
Что такое «временная таблица»? Для чего она используется?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-%D0%B2%D1%80%D0%B5%D0%BC%D0%B5%D0%BD%D0%BD%D0%B0%D1%8F-%D1%82%D0%B0%D0%B1%D0%BB%D0%B8%D1%86%D0%B0-%D0%94%D0%BB%D1%8F-%D1%87%D0%B5%D0%B3%D0%BE-%D0%BE%D0%BD%D0%B0-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D1%83%D0%B5%D1%82%D1%81%D1%8F
Что такое «представление» (view) и для чего оно применяется?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-%D0%BF%D1%80%D0%B5%D0%B4%D1%81%D1%82%D0%B0%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5-view-%D0%B8-%D0%B4%D0%BB%D1%8F-%D1%87%D0%B5%D0%B3%D0%BE-%D0%BE%D0%BD%D0%BE-%D0%BF%D1%80%D0%B8%D0%BC%D0%B5%D0%BD%D1%8F%D0%B5%D1%82%D1%81%D1%8F
Каков общий синтаксис оператора SELECT?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9A%D0%B0%D0%BA%D0%BE%D0%B2-%D0%BE%D0%B1%D1%89%D0%B8%D0%B9-%D1%81%D0%B8%D0%BD%D1%82%D0%B0%D0%BA%D1%81%D0%B8%D1%81-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%B0-select
Что такое JOIN?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-join
Какие существуют типы JOIN?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9A%D0%B0%D0%BA%D0%B8%D0%B5-%D1%81%D1%83%D1%89%D0%B5%D1%81%D1%82%D0%B2%D1%83%D1%8E%D1%82-%D1%82%D0%B8%D0%BF%D1%8B-join
Что лучше использовать JOIN или подзапросы?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D0%BB%D1%83%D1%87%D1%88%D0%B5-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D1%8C-join-%D0%B8%D0%BB%D0%B8-%D0%BF%D0%BE%D0%B4%D0%B7%D0%B0%D0%BF%D1%80%D0%BE%D1%81%D1%8B
Для чего используется оператор HAVING?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%94%D0%BB%D1%8F-%D1%87%D0%B5%D0%B3%D0%BE-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D1%83%D0%B5%D1%82%D1%81%D1%8F-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80-having
В чем различие между операторами HAVING и WHERE?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%92-%D1%87%D0%B5%D0%BC-%D1%80%D0%B0%D0%B7%D0%BB%D0%B8%D1%87%D0%B8%D0%B5-%D0%BC%D0%B5%D0%B6%D0%B4%D1%83-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%B0%D0%BC%D0%B8-having-%D0%B8-where
Для чего используется оператор ORDER BY?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%94%D0%BB%D1%8F-%D1%87%D0%B5%D0%B3%D0%BE-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D1%83%D0%B5%D1%82%D1%81%D1%8F-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80-order-by
Для чего используется оператор GROUP BY?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%94%D0%BB%D1%8F-%D1%87%D0%B5%D0%B3%D0%BE-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D1%83%D0%B5%D1%82%D1%81%D1%8F-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80-group-by
Как GROUP BY обрабатывает значение NULL?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9A%D0%B0%D0%BA-group-by-%D0%BE%D0%B1%D1%80%D0%B0%D0%B1%D0%B0%D1%82%D1%8B%D0%B2%D0%B0%D0%B5%D1%82-%D0%B7%D0%BD%D0%B0%D1%87%D0%B5%D0%BD%D0%B8%D0%B5-null
В чем разница между операторами GROUP BY и DISTINCT?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%92-%D1%87%D0%B5%D0%BC-%D1%80%D0%B0%D0%B7%D0%BD%D0%B8%D1%86%D0%B0-%D0%BC%D0%B5%D0%B6%D0%B4%D1%83-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%B0%D0%BC%D0%B8-group-by-%D0%B8-distinct
Перечислите основные агрегатные функции.https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9F%D0%B5%D1%80%D0%B5%D1%87%D0%B8%D1%81%D0%BB%D0%B8%D1%82%D0%B5-%D0%BE%D1%81%D0%BD%D0%BE%D0%B2%D0%BD%D1%8B%D0%B5-%D0%B0%D0%B3%D1%80%D0%B5%D0%B3%D0%B0%D1%82%D0%BD%D1%8B%D0%B5-%D1%84%D1%83%D0%BD%D0%BA%D1%86%D0%B8%D0%B8
В чем разница между COUNT(*) и COUNT({column})?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%92-%D1%87%D0%B5%D0%BC-%D1%80%D0%B0%D0%B7%D0%BD%D0%B8%D1%86%D0%B0-%D0%BC%D0%B5%D0%B6%D0%B4%D1%83-count-%D0%B8-countcolumn
Что делает оператор EXISTS?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D0%B4%D0%B5%D0%BB%D0%B0%D0%B5%D1%82-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80-exists
Для чего используются операторы IN, BETWEEN, LIKE?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%94%D0%BB%D1%8F-%D1%87%D0%B5%D0%B3%D0%BE-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D1%83%D1%8E%D1%82%D1%81%D1%8F-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D1%8B-in-between-like
Для чего применяется ключевое слово UNION?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%94%D0%BB%D1%8F-%D1%87%D0%B5%D0%B3%D0%BE-%D0%BF%D1%80%D0%B8%D0%BC%D0%B5%D0%BD%D1%8F%D0%B5%D1%82%D1%81%D1%8F-%D0%BA%D0%BB%D1%8E%D1%87%D0%B5%D0%B2%D0%BE%D0%B5-%D1%81%D0%BB%D0%BE%D0%B2%D0%BE-union
Какие ограничения на целостность данных существуют в SQL?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9A%D0%B0%D0%BA%D0%B8%D0%B5-%D0%BE%D0%B3%D1%80%D0%B0%D0%BD%D0%B8%D1%87%D0%B5%D0%BD%D0%B8%D1%8F-%D0%BD%D0%B0-%D1%86%D0%B5%D0%BB%D0%BE%D1%81%D1%82%D0%BD%D0%BE%D1%81%D1%82%D1%8C-%D0%B4%D0%B0%D0%BD%D0%BD%D1%8B%D1%85-%D1%81%D1%83%D1%89%D0%B5%D1%81%D1%82%D0%B2%D1%83%D1%8E%D1%82-%D0%B2-sql
Какие отличия между ограничениями PRIMARY и UNIQUE?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9A%D0%B0%D0%BA%D0%B8%D0%B5-%D0%BE%D1%82%D0%BB%D0%B8%D1%87%D0%B8%D1%8F-%D0%BC%D0%B5%D0%B6%D0%B4%D1%83-%D0%BE%D0%B3%D1%80%D0%B0%D0%BD%D0%B8%D1%87%D0%B5%D0%BD%D0%B8%D1%8F%D0%BC%D0%B8-primary-%D0%B8-unique
Может ли значение в столбце, на который наложено ограничение FOREIGN KEY, равняться NULL?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9C%D0%BE%D0%B6%D0%B5%D1%82-%D0%BB%D0%B8-%D0%B7%D0%BD%D0%B0%D1%87%D0%B5%D0%BD%D0%B8%D0%B5-%D0%B2-%D1%81%D1%82%D0%BE%D0%BB%D0%B1%D1%86%D0%B5-%D0%BD%D0%B0-%D0%BA%D0%BE%D1%82%D0%BE%D1%80%D1%8B%D0%B9-%D0%BD%D0%B0%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%BE-%D0%BE%D0%B3%D1%80%D0%B0%D0%BD%D0%B8%D1%87%D0%B5%D0%BD%D0%B8%D0%B5-foreign-key-%D1%80%D0%B0%D0%B2%D0%BD%D1%8F%D1%82%D1%8C%D1%81%D1%8F-null
Как создать индекс?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9A%D0%B0%D0%BA-%D1%81%D0%BE%D0%B7%D0%B4%D0%B0%D1%82%D1%8C-%D0%B8%D0%BD%D0%B4%D0%B5%D0%BA%D1%81
Что делает оператор MERGE?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D0%B4%D0%B5%D0%BB%D0%B0%D0%B5%D1%82-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80-merge
В чем отличие между операторами DELETE и TRUNCATE?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%92-%D1%87%D0%B5%D0%BC-%D0%BE%D1%82%D0%BB%D0%B8%D1%87%D0%B8%D0%B5-%D0%BC%D0%B5%D0%B6%D0%B4%D1%83-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%B0%D0%BC%D0%B8-delete-%D0%B8-truncate
Что такое «хранимая процедура»?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-%D1%85%D1%80%D0%B0%D0%BD%D0%B8%D0%BC%D0%B0%D1%8F-%D0%BF%D1%80%D0%BE%D1%86%D0%B5%D0%B4%D1%83%D1%80%D0%B0
Что такое «триггер»?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-%D1%82%D1%80%D0%B8%D0%B3%D0%B3%D0%B5%D1%80
Что такое «курсор»?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A7%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-%D0%BA%D1%83%D1%80%D1%81%D0%BE%D1%80
Опишите разницу типов данных DATETIME и TIMESTAMP.https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9E%D0%BF%D0%B8%D1%88%D0%B8%D1%82%D0%B5-%D1%80%D0%B0%D0%B7%D0%BD%D0%B8%D1%86%D1%83-%D1%82%D0%B8%D0%BF%D0%BE%D0%B2-%D0%B4%D0%B0%D0%BD%D0%BD%D1%8B%D1%85-datetime-%D0%B8-timestamp
Для каких числовых типов недопустимо использовать операции сложения/вычитания?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%94%D0%BB%D1%8F-%D0%BA%D0%B0%D0%BA%D0%B8%D1%85-%D1%87%D0%B8%D1%81%D0%BB%D0%BE%D0%B2%D1%8B%D1%85-%D1%82%D0%B8%D0%BF%D0%BE%D0%B2-%D0%BD%D0%B5%D0%B4%D0%BE%D0%BF%D1%83%D1%81%D1%82%D0%B8%D0%BC%D0%BE-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D1%8C-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D0%B8-%D1%81%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%B8%D1%8F%D0%B2%D1%8B%D1%87%D0%B8%D1%82%D0%B0%D0%BD%D0%B8%D1%8F
Какое назначение у операторов PIVOT и UNPIVOT в Transact-SQL?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9A%D0%B0%D0%BA%D0%BE%D0%B5-%D0%BD%D0%B0%D0%B7%D0%BD%D0%B0%D1%87%D0%B5%D0%BD%D0%B8%D0%B5-%D1%83-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%BE%D0%B2-pivot-%D0%B8-unpivot-%D0%B2-transact-sql
Расскажите об основных функциях ранжирования в Transact-SQL.https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%A0%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D0%B6%D0%B8%D1%82%D0%B5-%D0%BE%D0%B1-%D0%BE%D1%81%D0%BD%D0%BE%D0%B2%D0%BD%D1%8B%D1%85-%D1%84%D1%83%D0%BD%D0%BA%D1%86%D0%B8%D1%8F%D1%85-%D1%80%D0%B0%D0%BD%D0%B6%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F-%D0%B2-transact-sql
Для чего используются операторы INTERSECT, EXCEPT в Transact-SQL?https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%94%D0%BB%D1%8F-%D1%87%D0%B5%D0%B3%D0%BE-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D1%83%D1%8E%D1%82%D1%81%D1%8F-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D1%8B-intersect-except-%D0%B2-transact-sql
Напишите запрос...https://github.com/trykopa/java-interview/blob/master/sql.md#%D0%9D%D0%B0%D0%BF%D0%B8%D1%88%D0%B8%D1%82%D0%B5-%D0%B7%D0%B0%D0%BF%D1%80%D0%BE%D1%81
https://github.com/trykopa/java-interview/blob/master/sql.md#что-такое-sql
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#какие-существуют-операторы-sql
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#что-означает-null-в-sql
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#что-такое-временная-таблица-для-чего-она-используется
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#что-такое-представление-view-и-для-чего-оно-применяется
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#каков-общий-синтаксис-оператора-select
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#что-такое-join
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#какие-существуют-типы-join
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#что-лучше-использовать-join-или-подзапросы
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#для-чего-используется-оператор-having
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#в-чем-различие-между-операторами-having-и-where
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#для-чего-используется-оператор-order-by
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#для-чего-используется-оператор-group-by
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#как-group-by-обрабатывает-значение-null
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#в-чем-разница-между-операторами-group-by-и-distinct
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#перечислите-основные-агрегатные-функции
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
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к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#что-делает-оператор-exists
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#для-чего-используются-операторы-in-between-like
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
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к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
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к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
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к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#может-ли-значение-в-столбце-на-который-наложено-ограничение-foreign-key-равняться-null
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#как-создать-индекс
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#что-делает-оператор-merge
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
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к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#что-такое-хранимая-процедура
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
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к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
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к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#опишите-разницу-типов-данных-datetime-и-timestamp
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#для-каких-числовых-типов-недопустимо-использовать-операции-сложениявычитания
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#какое-назначение-у-операторов-pivot-и-unpivot-в-transact-sql
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#расскажите-об-основных-функциях-ранжирования-в-transact-sql
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#для-чего-используются-операторы-intersect-except-в-transact-sql
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#напишите-запрос
к оглавлениюhttps://github.com/trykopa/java-interview/blob/master/sql.md#sql
https://github.com/trykopa/java-interview/blob/master/sql.md#источники
Википедияhttps://ru.wikipedia.org/wiki/SQL
Quizfulhttp://www.quizful.net/interview/sql
Вопросы для собеседованияhttps://github.com/trykopa/java-interview/blob/master/README.md
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