Load: ethanz@ethanz-U:~$ psql -d scportal -h localhost -U ethanz -f /home/ethanz/database_dump1.sql Then postgresql will automatically drop the database, index, table, sequence and recreate them then load the data. I think it's a good solution to resynchronize small buntch of dat...
array_to_json takes a PostgreSQL array and returns a single JSON value. The exported data is saved to the current working directory in a file named users.json. However, sometimes we only want to export a subset of the columns — first_name, last_name, email— instead of the complete ...
2 下载PostgreSQL安装包 https://www.postgresql.org/download/windows/ 建议下载高级安装包,不需要安装,直接使用。 下载win x64的版本(建议下载最新版本) http://www.enterprisedb.com/products/pgbindownload.do 例如 https://get.enterprisedb.com/postgresql/postgresql-9.6.2-3-windows-x64-binaries.zip 3 解压...
When we want to copy data from one database to another one, we need to split the data structure and the actual data. For this example, we will use PosgreSQL sample database calledDVDrental. Tables Definition The first task consists in getting the table definition out of PostgreSQL. ...
tablespace_name:Specify the name of the tablespace. If you do not specify the tablespace, the table will be created inpg_defaulttablespace PostgreSQL supports the following column constraints: PRIMARY KEY:The primary key identifies a record from the table uniquely. A PostgreSQL table can have only...
While working with spreadsheets, you can also export the data to a CSV file and use the data in other functions. This tutorial will demonstrate how to populate a table in a PostgreSQL database using a CSV file. Step-By-Step Guide to Import CSV File Data Into a Table in PostgreSQL Use ...
We hope from the above article; you have understood how to export the PostgreSQL table or result in a set of the query to the comma-separated file format and how the export of the PostgreSQL table or result in a set of the query to the comma-separated file format work. Also, we have...
After that, psql will ask you to enter the user's password. Type in it and press Enter to log into the server. List all the users with: \du This command will produce a table containing the users in the PostgreSQL server: The table returned by the "\du" command. Use \du+ to get...
PostgreSQL provides a RENAME COLUMN clause that is used with the collaboration of ALTER TABLE command to rename a column.
\COPY:This is the command to copy the record to / from the .csv file. <table name>:Provides the table name where you want to import the data. FROM:Specifies that we are going to import from a file (we will also be usingTOin order to export it to a file at a later stage). ...