260 best questions for Postgresql

We've collected 260 best questions in the «Postgresql» category so you can quickly find the answer to your question!



Those interested in the Postgresql category often ask the following questions:

💻 Is postgresql free?

  • PostgreSQL is free and open source software. Its source code is available under PostgreSQL license, a liberal open source license. You are free to use, modify and distribute PostgreSQL in any form. PostgreSQL requires very minimum maintained efforts because of its stability.

💻 Is postgresql safe?

PostgreSQL generally uses little CPU, RAM or disk I/O unless it's actually being used for serious work, so it's fairly safe to ignore it.

💻 What software installs postgresql?

Select software components to install: The PostgreSQL Server to install the PostgreSQL database server pgAdmin 4 to install the PostgreSQL database GUI management tool. Command Line Tools to install command-line tools such as psql, pg_restore, etc. These tools allow you to interact with... Stack ...

💻 Is postgresql a server?

PostgreSQL server is process-based (not threaded), and uses one operating system process per database session. Multiple sessions are automatically spread across all available CPUs by the operating system.

💻 Is postgresql multi-model?

The traditional Relational Database Management Systems (RDBMS) are not clearly suitable for meeting these needs… More specifically, we evaluate PostgreSQL as a multi-model database with support for the following data models: row-oriented, column-oriented, key-value, and document-oriented.

Video from Postgresql

We’ve collected for you several video answers to questions from the «Postgresql» category:

Video answer: How to create postgresql user and database

How to create postgresql user and database

Video answer: Import xslx/csv file to postgresql database

Import xslx/csv file to postgresql database

Video answer: How to create a postgres database using pgadmin - training video

How to create a postgres database using pgadmin - training video

Video answer: Demo of using python to connect to postgresql trading database

Demo of using python to connect to postgresql trading database

Top 240 questions from Postgresql

We’ve collected for you 240 similar questions from the «Postgresql» category:

How to install postgresql dev?

  1. Install PostgreSQL from PostgreSQL Apt Repository. Step 1: Add PostgreSQL Repository. Step 2: Update the Package List. Step 3: Install PostgreSQL.
  2. Install PostgreSQL from Local Ubuntu Repository. Step 1: Check Available PostgreSQL Version. Step 2: Install PostgreSQL Package.
  3. Connect to PostgreSQL.
  4. Check Connection Information.

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How to create backup postgresql?

  • To back up, a PostgreSQL database, start by logging into your database server, then switch to the Postgres user account, and run pg_dump as follows (replace tecmintdb with the name of the database you want to backup). By default, the output format is a plain-text SQL script file. $ pg_dump tecmintdb > tecmintdb.sql

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How to run postgresql server?

Which is the best way to start a PostgreSQL server?

  • The bare-bones way to start the server manually is just to invoke postgres directly, specifying the location of the data directory with the -D option, for example: $ postgres -D /usr/local/pgsql/data which will leave the server running in the foreground. This must be done while logged into the PostgreSQL user account.

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How to access table in postgresql?

  • In PostgreSQL , we can retrieve the list of tables by either using dt command when you are using psql or retrieve the list of tables using the SELECt query from the pg_tables table of pg_catalog schema. We will see how we can use both of these methods one by one.

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How to get xml from postgresql?

I too have had this question. In my research, I have come accross pages that indicate XML support is currently under development. There is a patch for PostgreSQL version 8.2.1 found here : Version 8.3 of PostgreSQL already has this functionality. I have only just downloaded this patch myself. I am not able, at this time, to give a full answer. I can only redirect you to this link : If someone has already figured out a full answer, feel free to contribute. ( Be advised, the links given above are valid at the time of this writing. Your milage my vary. )

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How to select database in postgresql?

  • PostgreSQL allows selecting database in different ways. If we are using pgAdmin, we can just double click on the database and it will automatically select the database and will prompt for a password. If we are using psql command-line client we can use the following command.

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Which is better mongodb or postgresql?

Both databases are awesome. If you are looking for a distributed database for modern transactional and analytical applications that are working with rapidly changing, multi-structured data, then MongoDB is the way to go. If a SQL database fits your needs, then Postgres is a great choice.

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Which is better mysql or postgresql?

In general, PostgreSQL is best suited for systems that require execution of complex queries, or data warehousing and data analysis. MySQL is the first choice for those web-based projects which require a database merely for data transactions and not anything intricate.

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What is the latest postgresql version?

  • They add new trigger features, with SQL standard compliant per-column triggers and conditional trigger execution.
  • This version is fully supported for 64-bit Windows.
  • There is a new execution of VACUUM FULL.

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Where is the postgresql database stored?

All the data needed for a database cluster is stored within the cluster's data directory, commonly referred to as PGDATA (after the name of the environment variable that can be used to define it). A common location for PGDATA is /var/lib/pgsql/data.

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How to change postgresql store database?

  • Listing and Switching Databases in PostgreSQL When you need to change between databases, you’ll use the connect command, or c followed by the database name as shown below: postgres=# connect database_name postgres=# c database_name Check the database you are currently connected to.

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How to make backups of postgresql?

  • Create your Microsoft Azure Blob Storage. Sign in to your Microsoft Azure Portal…
  • you'll need to provide credentials to SimpleBackups.
  • Connect your Azure Blob Storage to SimpleBackups…
  • Final step: Create your PostgreSQL backup…

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How to use postgresql in python?

To create a Postgres table in Python, we use the CREATE TABLE SQL statement. This query should be executed after establishing a connection to the database. We also create a cursor object by calling the cursor() method that belongs to the connection object. This cursor object is used to actually execute your commands.

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How to use union in postgresql?

  • Basic Usage The general syntax for the UNION query in PostgreSQL is: SELECT col1, col2, col3, …coln FROM tb1 UNION SELECT col1, col2, col3, …coln FROM tb2 WHERE condition; Although you will mostly be selecting specific columns, you can pass other valid PostgreSQL expressions to the select statements.

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Can i store json in postgresql?

As mentioned before PostgreSQL supports two data types: JSON and JSONB… To begin with, JSON data type stores an exact copy of the input text and thus processing function has to parse it every time it is necessary. On the contrary, JSONB is stored as a decomposed binary format and thus no parsing is needed.

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How to enter entry in postgresql?

The PostgreSQL INSERT statement allows you to insert a new row into a table. In this syntax: First, specify the name of the table ( table_name ) that you want to insert data after the INSERT INTO keywords and a list of comma-separated columns ( colum1, column2, .... ).

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How to delete user in postgresql?

  • Delete a PostgreSQL user To delete a PostgreSQL user account, perform the following steps: Click Delete in the row next to the user that you wish to delete. To permanently delete the account, click Remove User.

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How to create function in postgresql?

  • In PostgreSQL, if we want to specify a new user-defined function, we can use the CREATE FUNCTION command. Syntax of PostgreSQL CREATE Function command The Syntax for PostgreSQL CREATE Function command is as follows: CREATE [OR REPLACE] FUNCTION function_name (arguments)

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How to read bytea in postgresql?

  • To use the BYTEA data type you should simply use the getBytes (), setBytes () , getBinaryStream (), or setBinaryStream () methods. To use the Large Object functionality you can use either the LargeObject class provided by the PostgreSQL™ JDBC driver, or by using the getBLOB () and setBLOB () methods.

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How to reorder columns in postgresql?

  • PostgreSQL currently defines column order based on the attnum column of the pg_attribute table. The only way to change column order is either by recreating the table, or by adding columns and rotating data until you reach the desired layout.

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Should i learn mysql or postgresql?

In general, PostgreSQL is best suited for systems that require execution of complex queries, or data warehousing and data analysis. MySQL is the first choice for those web-based projects which require a database merely for data transactions and not anything intricate.

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How do i upgrade postgresql version?

To upgrade a cluster to a newer version of PostgreSQL, open the Databases page and then click on the cluster you want to upgrade. On the cluster's Overview page, scroll down to the CURRENT VERSION section and then click Upgrade Now. Select the version of PostgreSQL you want to use.

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How does update work in postgresql?

  1. First step is to specify the table where the changes are supposed to be made.
  2. Then we list the columns whose value is to be updated using the SET clause.
  3. The final step is to determine which rows you want to update exactly using the WHERE clause.

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Why postgresql is better than mysql?

  • MySQL is used in extremely high volume environments without problems. PostgreSQL's advanced features are more likely to be stable than the newer MySQL equivalents, having been implemented for longer. However, replication is much newer in PostgreSQL than MySQL, so the reverse applies.

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How to re encode postgresql databases? › questions › 380924 How can I change database encoding for a PostgreSQL database ...

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How to delete rows in postgresql?

How to delete an existing row from a table?

  • To delete a row, column, or table, place the insertion point inside the table, or select text in the table, and then choose Table > Delete > Row, Column, or Table. To delete rows and columns by using the Table Options dialog box, choose Table > Table Options > Table Setup. Specify a different number of rows and columns, and then click OK.

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How group by works in postgresql?

What is group by and order by?

  • GROUP BY and ORDER BY can be used in the same query and it is NOT required that they be the same column. GROUP BY controls the way the data is organized for sumarization. ORDER BY simply sorts the rows of the result.

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How to use postgresql with android?

Can you run PostgreSQL server side on Android?

  • For Postgres you have to develop server side application and api services which you can the call from Android Okay, this may be obsolete but still helpful for users (it was helpful for me) I copied your example and worked with it because I also need to get postgres running on android.

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How to add application user postgresql?

  • Initially, you must connect to PostgreSQL as the postgres user until you create other users (which are also referred to as roles ). You can now run commands as the PostgreSQL superuser. To create a user, type the following command: At the Enter name of role to add: prompt, type the user's name.

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How to create table in postgresql?

How to select database in PostgreSQL?

  • PostgreSQL allows selecting database in different ways. If we are using pgAdmin, we can just double click on the database and it will automatically select the database and will prompt for a password. If we are using psql command-line client we can use the following command.

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How to migrate oracle to postgresql?

  1. Step 1: Install the SQL Drivers and AWS Schema Conversion Tool on Your Local Computer.
  2. Step 2: Configure Your Oracle Source Database.
  3. Step 3: Configure Your PostgreSQL Target Database.
  4. Step 4: Use the AWS Schema Conversion Tool (AWS SCT) to Convert the Oracle Schema to PostgreSQL.

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When to use postgresql or mysql?

  • PostgreSQL. MySQL. PostgreSQL is widely used in large systems where read and write speeds are crucial and data needs to validated. In addition, it supports a variety of performance optimizations that are available only in commercial solutions such as Geospatial data support, concurrency without read locks, and so on (e.g. Oracle, SQL Server).

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What is the driver for postgresql?

psqlODBC is the official PostgreSQL ODBC Driver.

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Can i download postgresql for free?

  • It has a simple and basic user interface, and most importantly, it is free to download. PostgreSQL is an efficient software that is recommended by many Windows PC users. Although there are many popular Developer Tools software, most people download and install the Open Source version. However, don’t forget to update the programs periodically.

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How to change settings in postgresql?

  • During server startup, parameter settings can be passed to the postgres command via the -c command-line parameter. For example, Settings provided in this way override those set via postgresql.conf or ALTER SYSTEM, so they cannot be changed globally without restarting the server.

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Which is better postgresql or mysql?

In general, PostgreSQL is best suited for systems that require execution of complex queries, or data warehousing and data analysis. MySQL is the first choice for those web-based projects which require a database merely for data transactions and not anything intricate.

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How install postgresql putty on linux?

  1. Step 1: Download postgreSQL source code…
  2. Step 2: Install postgreSQL…
  3. Step 3: Verify the postgreSQL directory structure…
  4. Step 4: Create postgreSQL user account…
  5. Step 5: Create postgreSQL data directory…
  6. Step 6: Initialize postgreSQL data directory.

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How to store audio files postgresql?

I want to build a database which contains all the tags of a collection of audio files (FLAC, Vorbis, MP3, whatever). I've already sorted out the extraction (that was the easy part), but now I have some doubts about how to properly design the database that will contain

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What is a postgresql vacuum table?

  • If specified, these are the columns that will be analyzed. Each time you perform an update on a table, the original record is kept in the database. A vacuum will remove these old records (ie: tuples) and reduce the size of the PostgreSQL database. You can only those vacuum tables in which you have VACUUM permissions.

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How do you exit out of postgresql?

To quit psql, you use \q command and press enter to exit psql.

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How to backup postgresql database to dvdrental.tar?

  • The pg_dump dumps out the content of all database objects into a single file. Second, execute the pg_dump program and use the following options to backup the dvdrental database to the dvdrental.tar file in the c:\\pgbackup\\ folder. Let’s examine the options in more detail. -U postgres: specifies the user to connect to PostgreSQL database server.

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How to import excel into postgresql database?

  • go to the Data tab…
  • select ODBC DSN and click Next to continue.
  • and click Next.
  • select its name and click Next to enter and save information about your new file or click Finish.

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How to get command line postgresql mac?

  • As we mentioned earlier, there are three common ways to install PostgreSQL on macOS. You can use a downloadable DMG installer from, a Homebrew repository for Postgres or a MacPorts installation that uses the port command line interface.

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How to get current month in postgresql?

  • If you’re familiar with PostgreSQL, you might know that you can use the EXTRACT () and the DATE_PART () functions to extract the month from a date. But those functions only allow you to extract the month number. What if you need the month name? You can get the month name from a date by using the TO_CHAR () function.

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When to vacuum a table in postgresql?

  • The answer to this question can again be found in postgresql.conf: The autovacuum_vacuum_scale_factor command tells PostgreSQL that a table is worth vacuuming if 20% of data has been changed. The trouble is that if a table consists of one row, one change is already 100%.

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What is the default port for postgresql?

Connecting to Your Database

The PostgreSQL database service is available on localhost at the default port 5432 . A default user ( hosting-db ) and database ( postgres ) exist so you can quickly test your connection and perform management tasks.

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What is the default username for postgresql?

  • peer authentication on the other hand, is used for local connections and verifies that the logged in username of the operating system matches the username for the Postgres database. Login and Connect as Default User. For most systems, the default Postgres user is postgres and a password is not required for authentication.

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How to create a tablespace in postgresql?

  • Here are the steps for creating a tablespace in PostgreSQL using the pgAdmin4 : Right click on "Tablespaces", choose "Create", choose "Tablespace". In the "General" tab, enter the name, the owner of the tablespace and a description of the tablespace. Enter the directory where the tablespace file will be stored.

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Can we migrate sql server to postgresql?

MSSQL-to-PostgreSQL is a program to migrate and synchronize data between SQL Server or SQL Azure and PostgreSQL. High performance due to direct connection to source and destination databases. Command line support allows to script, automate and schedule the conversion process.

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How to create spatial database in postgresql?

  • PostGIS can be only installed per a database so you first need to create a database using the following command in your terminal: $ sudo -u postgres createdb myspatialdb Please note that postgres is the default PostgreSQL user, you can also use your user if you've created one. This command will create a database called myspatialdb.

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