{"id":19514598,"url":"https://github.com/jcoderpaul/my_little_sql_guide","last_synced_at":"2026-04-15T21:31:29.176Z","repository":{"id":175331272,"uuid":"602971709","full_name":"JcoderPaul/My_Little_SQL_Guide","owner":"JcoderPaul","description":"The most common commands, queries, functions in SQL-type databases. 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позволяет создавать и определять таблицу ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/MySQL/CREATE%20TABLE.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/PostgreSQL/CREATE%20(TABLE%2C%20SCHEMA).sql));\n- [CREATE TABLE AS](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/CREATE%20TABLE%20AS.md) - используется для создания таблицы из \n                  существующей таблицы путем копирования \n                  столбцов существующей таблицы ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/MySQL/SUBQ%20from%20TABLE.sql));\n- [ALTER TABLE](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/ALTER%20TABLE.md) - используется для добавления, изменения или \n              удаления столбцов в таблице ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/MySQL/ALTER%20TABLE.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/edit/master/SQL%20DDL%20COMMAND/PostgreSQL/ALTER.sql));\n- [DROP TABLE](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/DROP%20TABLE.md) - позволяет стереть или удалить таблицу из базы данных;\n- [VIEW](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/VIEW.md) - представляет собой виртуальную таблицу, созданную запросом, \n       соединяющим одну или несколько таблиц ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/MySQL/VIEW%20CREATE%202.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DDL%20COMMAND/PostgreSQL/VIEW.sql));\n  \n---\n### **[Ключи, индексы, ограничения в SQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/SQL%20CONSTRAINT)**\n\n- [Primary Keys](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/Primary%20Keys.md) - Первичные ключи ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/MySQL/CONSTRAINT%20-%20Primary%20Keys%20(duble%20constr).sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/PostgreSQL/PRIMARY%20KEY%20in%20PostgreSQL.sql));\n- [Foreign Keys](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/Foreign%20Keys.md) - Внешние ключи ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/MySQL/CONSTRAINT%20-%20FOREIGN%20KEY.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/PostgreSQL/FOREIGN%20KEY%20in%20PostgreSQL.sql));\n- Foreign Keys with cascade delete - Внешние ключи с каскадным удалением;\n- Foreign Keys with set null on delete - Внешние ключи с «set null on delete»;\n- Drop a foreign key - Удаление внешнего ключа;\n- Disable a foreign key - Выключение внешнего ключа;\n- Enable a foreign key - Включение внешнего ключа;\n- Indexes - Индексы;\n- [unique constraints](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/UNIQUE.md) - Уникальное ограничение ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/MySQL/CONSTRAINT%20-%20UNIQUE.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/PostgreSQL/UNIQUE%20in%20PostgreSQL.sql));\n- [check constraints](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/CHECK.md) - Проверка ограничения ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/MySQL/CONSTRAINT%20-%20CHECK.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONSTRAINT/PostgreSQL/CHECK%20in%20PostgreSQL.sql));\n\n---\n### **[Типы SQL-запросов](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/SQL%20DML%20COMMAND)**\n\n- [SELECT](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/SELECT.md) - Извлечение записей из таблицы ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/SELECT.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/PostgreSQL/SELECT%20with%20ORDER%20BY%20and%20DESC.sql));\n- [INSERT](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/INSERT.md) - Вставка записей в таблицу ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/INSERT.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/PostgreSQL/INSERT%20(TABLE%2C%20SCHEMA).sql));\n- [ORDER BY](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/ORDER%20BY.md) - Сортировать результаты запроса ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/ORDER%20BY_DESC.sql));\n- [DISTINCT](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/DISTINCT.md) - Получить уникальные записи ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/DISTINCT.sql));\n- [SELECT LIMIT](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/SELECT_LIMIT.md) - Извлечение записей из таблицы и ограничение результатов ([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/PostgreSQL/SELECT%20with%20ALIAS.sql));\n- [SELECT TOP](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/SELECT_TOP.md) - Извлечение записей из таблицы и ограничение результатов;\n- [WHERE](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/WHERE_AND_OR.md) - Фильтр результатов;\n- [FROM](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/FROM_OUTER_INNER_JOIN.md) - Список таблицы и JOIN информация;\n- [UNION](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/UNION.md) - Объединяет 2 набора результатов (удаляет дубликаты) ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/UNION.sql));\n- [UNION ALL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/UNION%20ALL.md) - Объединяет 2 набора результатов (включает дубликаты) ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/UNION%20ALL.sql));\n- [DELETE](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/DELETE.md) - Удалить записи из таблиц ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/DELETE.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/PostgreSQL/DELETE.sql));\n- [UPDATE](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/UPDATE.md) - Обновление записей в таблице ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/UPDATE.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/PostgreSQL/UPDATE.sql));\n- [JOIN](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/JOIN.md) - Соединение таблиц ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/JOIN%20and%20GROUP%20BY.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/PostgreSQL/JOINs.sql));\n- [GROUP BY](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/GROUP%20BY.md) - Группировать по одному или нескольким столбцам ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/GROUP%20and%20HAVING.sql));\n- [HAVING](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/HAVING.md) - Ограничить группы возвращаемых строк ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/MySQL/GROUP%20and%20HAVING.sql)),([PostgreSQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/PostgreSQL/HAVING.sql));\n- [EXCEPT](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/EXCEPT.md) - Набор результатов одного минус набор результатов другого;\n- [EXISTS](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20DML%20COMMAND/EXISTS.md) - Используется в запросе с WHERE для проверки наличия хотя бы одной строки в результате подзапроса, возвращая TRUE, если строки есть, и FALS;\n- TRUNCATE TABLE - Удалить все записи из таблицы (без отката);\n- INTERSECT - Пересечение 2 наборов результатов;\n- MINUS - Результирующий набор одного минус результирующий набор другого;\n\n---\n### **[SQL условия (Булева логика)](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/SQL%20CONDITIONS)** \n\n- [AND](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/AND.md) - 2 или более условия, которые должны быть выполнены ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/MySQL/LIKE_AND_OR.sql));\n- [OR](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/OR.md) - Любое из условий выполнено ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/MySQL/LIKE_AND_OR.sql));\n- AND И OR - Сочетание условий AND И OR (MySQL пример);\n- [LIKE](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/LIKE.md) - Используйте подстановочные знаки в предложении WHERE ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/MySQL/LIKE_AND_OR.sql));\n- [IN](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/IN.md) - Соответствие выражения списку значений ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/MySQL/BETWEEN%20ond%20IN.sql));\n- NOT - Отрицание;\n- [IS NULL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/IS%20NULL.md) - Проверка значения на NULL (MySQL пример);\n- [IS NOT NULL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/IS%20NOT%20NULL.md) - Проверка значения на NOT NULL (MySQL пример);\n- [BETWEEN](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/BETWEEN.md) - Выборка в пределах диапазона (включительно) ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20CONDITIONS/MySQL/BETWEEN%20ond%20IN.sql));\n- EXISTS - Условие выполняется, если подзапрос возвращает хотя бы одну строку;\n\n---\n### **[Агрегирующие функции SQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/SQL%20FUNCTIONS)**\n\n- [COUNT](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/COUNT.md) - Возвращает количество выражений ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/MySQL/GROUP%20FUNCTION%20-%20COUNT.sql));\n- [SUM](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/SUM.md) - Возвращает сумму выражения ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/MySQL/GROUP%20FUNCTION%20-%20SUM.sql));\n- [MIN](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/MIN.md) - Возвращает минимум выражения ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/MySQL/GROUP%20FUNCTION%20-%20MAX%20%D0%B8%20MIN.sql));\n- [MAX](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/MAX.md) - Возвращает максимум выражения ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/MySQL/GROUP%20FUNCTION%20-%20MAX%20%D0%B8%20MIN.sql));\n- [AVG](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/AVG.md) - Возвращает среднее значение выражения ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20FUNCTIONS/MySQL/MAX_MIN_AVG.sql));\n\n---\n### **Прочие функции**\n\n- [Символьные / строчные функции](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/SQL%20STRING%20FUNCTIONS):\n\t- [Oracle PL/SQL и MySQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20STRING%20FUNCTIONS/SQL_STRING_FUNCTIONS.md);\n\t- [PostrgeSQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SQL%20STRING%20FUNCTIONS/PostgreSQL_STRING_FUNCTIONS.md);\n\n- [Дополнительные функции SQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/ADDITIONAL%20FUNCTIONS):\n\t- [MySQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/ADDITIONAL%20FUNCTIONS/ADDITIONAL_FUNCTIONS_in_MYSQL%20.md) ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/ADDITIONAL%20FUNCTIONS/MySQL));\n\n- [Функции Даты / Времени](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/DATA%20FUNCTIONS):\n\t- [MySQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/DATA%20FUNCTIONS/DATA_and_TIME_in_MYSQL.md) ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/DATA%20FUNCTIONS/MySQL));\n\t- [PostgreSQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/DATA%20FUNCTIONS/PostgreSQL_DATA_and_TIME.md);\n\n- [Числовые / математические функции SQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/NUMERIC%20FUNCTIONS):\n\t- [MySQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/NUMERIC%20FUNCTIONS/MySQL_NUMERIC_FUNCTIONS.md) ([MySQL пример](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/NUMERIC%20FUNCTIONS/MySQL));\n\t- [PostgreSQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/NUMERIC%20FUNCTIONS/PostgreSQL_NUMERIC_FUNCTIONS.md);\n- [Подзапросы SUBQUERYS](https://github.com/JcoderPaul/My_Little_SQL_Guide/blob/master/SUBQUERY%20EXAMPLE/SUBQUERYS.md):\n\t- [MySQL примеры](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/SUBQUERY%20EXAMPLE/MySQL);\n\n---\n### **[Примеры решения задач по PostgreSQL](https://github.com/JcoderPaul/My_Little_SQL_Guide/tree/master/SQL%20DML%20COMMAND/PostgreSQL_HW)**\n\nОфициальный сайт (см. документацию и дистрибутивы):\n- MySQL: https://www.mysql.com/\n- PostgreSQL: https://www.postgresql.org/\n- Oracle PL/SQL: https://www.oracle.com/database/sqldeveloper/\n- SQL SERVER: https://www.microsoft.com/ru-ru/sql-server/sql-server-downloads\n- SQLite: https://www.sqlite.org/index.html\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjcoderpaul%2Fmy_little_sql_guide","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjcoderpaul%2Fmy_little_sql_guide","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjcoderpaul%2Fmy_little_sql_guide/lists"}