Для чего используется LIMIT: select * from Orders limit 10;
Anonymous Quiz
4%
Необходим, чтобы показать все заказы с цифрой 10
11%
Необходим, чтобы показать случайные 10 записей в запрос
78%
Необходим, чтобы показать 10 первых записей в запросе
4%
Нет такого оператора
4%
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Mastering_PostgreSQL_in_Application_Development_Fontaine_Dimitri
2.1 MB
🇸mall gift!
Mastering PostgreSQL in Application Development. Fontaine Dimitri
PostgreSQL is one of the most effective and popular DBMS used in working with big data. This book is an up-to-date reference guide to PostgreSQL and considers important modern functions for working with data, optimizing loads and much more.
Mastering PostgreSQL in Application Development. Fontaine Dimitri
PostgreSQL is one of the most effective and popular DBMS used in working with big data. This book is an up-to-date reference guide to PostgreSQL and considers important modern functions for working with data, optimizing loads and much more.
Какая команда упорядочивает результаты?
Anonymous Quiz
9%
ORDER
12%
SORT
64%
ORDER BY
12%
SORT BY
4%
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PostGIS in Action. R. O. Obe, L. S. Hsu
5 MB
😁Продолжаем собирать полезные учебники!
PostGIS in Action. R. O. Obe, L. S. Hsu
Post GIS (pronounced post-jis) is a spatial database extender for the PostgreSQL open source relational database management system. It’s the most powerful open source spatial database engine. It adds to P ostgre SQL several spatial data types and over 300 functions for working with these spatial types. It does for P ostgre SQL what Oracle Spatial/Locator does for Oracle, what IBM DB2 /Information spatial DataBlades do for DB2 and Informix, and what geometry/geography types packaged in Microsoft SQL S erver 2008+ do for SQL S erver. P ost GIS supports many of the OGC/ISO SQL/ MM –compliant spatial functions you’ll find in these other OGC -compliant databases as
well as numerous additional ones that are unique to P ost GIS.
PostGIS in Action. R. O. Obe, L. S. Hsu
Post GIS (pronounced post-jis) is a spatial database extender for the PostgreSQL open source relational database management system. It’s the most powerful open source spatial database engine. It adds to P ostgre SQL several spatial data types and over 300 functions for working with these spatial types. It does for P ostgre SQL what Oracle Spatial/Locator does for Oracle, what IBM DB2 /Information spatial DataBlades do for DB2 and Informix, and what geometry/geography types packaged in Microsoft SQL S erver 2008+ do for SQL S erver. P ost GIS supports many of the OGC/ISO SQL/ MM –compliant spatial functions you’ll find in these other OGC -compliant databases as
well as numerous additional ones that are unique to P ost GIS.
PostgreSQL High Availability Cookbook, 2nd Edition. Shaun Thomas
6.2 MB
😁Самое время запланировать начать новое обучение - ловите учебник!
PostgreSQL High Availability Cookbook, 2nd Edition. Shaun Thomas
Welcome to the PostgreSQL 9 High Availability Cookbook! As a database engine, PostgreSQL is settling into its place as a reliable bastion of high-transaction rates and very large data installations. DB-Engines recently listed PostgreSQL as the third most popular database software in the world! With such notoriety comes increasing demand for PostgreSQL to act as a critical piece of infrastructure. System outages in these environments can be spectacularly costly and require a higher caliber of management and tooling.
It is the job of a DBA to ensure that the database is always available for application demands and client needs. Yet this is extremely difficult to accomplish without the necessary skills and experience with common operating-system and PostgreSQL tools. Installing, configuring, and optimizing a PostgreSQL cluster is but a tiny fraction of the process.
PostgreSQL High Availability Cookbook, 2nd Edition. Shaun Thomas
Welcome to the PostgreSQL 9 High Availability Cookbook! As a database engine, PostgreSQL is settling into its place as a reliable bastion of high-transaction rates and very large data installations. DB-Engines recently listed PostgreSQL as the third most popular database software in the world! With such notoriety comes increasing demand for PostgreSQL to act as a critical piece of infrastructure. System outages in these environments can be spectacularly costly and require a higher caliber of management and tooling.
It is the job of a DBA to ensure that the database is always available for application demands and client needs. Yet this is extremely difficult to accomplish without the necessary skills and experience with common operating-system and PostgreSQL tools. Installing, configuring, and optimizing a PostgreSQL cluster is but a tiny fraction of the process.
Какого числового типа нет в MySQL?
Anonymous Quiz
9%
INTEGER
32%
DOUBLE
14%
FLOAT
29%
BYTE
16%
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Работа_с_MySQL,_MS_SQL_Server_и_Oracle_в_примерах_С_Куликов
9.9 MB
🥲Учимся и плачем!
Работа с MySQL, MS SQL Server и Oracle в примерах. С. Куликов
Эта книга посвящена практике использования SQL для решения типичных задач. Здесь не рассматривается теория реляционных баз данных (предполагается, что вы с ней знакомы либо способны найти недостающую информацию), но приведено более 500 SQL-запросов: от элементарных выборок до использования представлений, триггеров, хранимых процедур и функций.
Работа с MySQL, MS SQL Server и Oracle в примерах. С. Куликов
Эта книга посвящена практике использования SQL для решения типичных задач. Здесь не рассматривается теория реляционных баз данных (предполагается, что вы с ней знакомы либо способны найти недостающую информацию), но приведено более 500 SQL-запросов: от элементарных выборок до использования представлений, триггеров, хранимых процедур и функций.
Как выбрать столбец с именем FirstName из таблицы Persons?
Anonymous Quiz
4%
SELECT Persons.FirstName
6%
EXTRACT FirstName FROM Persons
81%
SELECT FirstName FROM Persons
6%
SELECT Persons FROM FirstName
3%
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