This is not so useful in trivial inserts, since it would just repeat the data provided by the client. In an INSERT, the data available to RETURNING is the row as it was inserted. A common shorthand is RETURNING *, which selects all columns of the target table in order. It can contain column names of the command's target table, or value expressions using those columns. The allowed contents of a RETURNING clause are the same as a SELECT command's output list (see Section 7.3). Use of RETURNING avoids performing an extra database query to collect the data, and is especially valuable when it would otherwise be difficult to identify the modified rows reliably. The INSERT, UPDATE, and DELETE commands all have an optional RETURNING clause that supports this. Step 17: Quit from the Database mytest=# quitīy this How to Insert, Update and Delete Data in PostgreSQL on Ubuntu 21.04 has been completed.Sometimes it is useful to obtain data from modified rows while they are being manipulated. Step 16: View ALL Data in the tables by using the below command mytest=# select * from cafe Step 15: Delete data of the table by using the below command mytest=# delete from cafe where id = 6 Step 14: View ALL Data in the tables by using the below command mytest=# select * from cafe Step 13: Update data of the table by using the below command mytest=# update cafe SET price = price * 1.1 WHERE category = 'tea' Step 12: View ALL Data in the tables by using the below command mytest=# select * from cafe Step 11: Insert Rows to the table by using the below command mytest=# insert into cafe (category, name, price) VALUES Id | category | name | price | last_update Step 10: View ALL Data in the tables by using the below command mytest=# select * from cafe Public | cafe | table | postgres | permanent | heap | 0 bytes | Schema | Name | Type | Owner | Persistence | Access method | Size | Description Step 9: Display all tables in the current database by using the below command mytest=# \dt+ Price NUMERIC(5,2) NOT NULL, - 5 digits total, with 2 decimal places Name VARCHAR(50) NOT NULL, - Variable-length string of up to 50 characters Id SERIAL PRIMARY KEY, - AUTO_INCREMENT integer, as primary keyĬategory cat_enum NOT NULL, - Use the enum type defined earlier Step 8: Create a new table by using the below command mytest=# create table if not exists cafe ( Public | cat_enum | cat_enum | 4 | coffee +| postgres | | Schema | Name | Internal name | Size | Elements | Owner | Access privileges | Description Step 7: Display all types via /dT mytest=# \dT+ Step 6: Use an enumeration (TYPE) in our table by using the below command mytest=# create type cat_enum AS ENUM ('coffee', 'tea') You are now connected to database "mytest" as user "postgres". Step 5: Connect to mytest database via \c by using the below command postgres=# \c mytest Template1 | postgres | UTF8 | en_IN | en_IN | =c/postgres + Template0 | postgres | UTF8 | en_IN | en_IN | =c/postgres + Postgres | postgres | UTF8 | en_IN | en_IN | Mytest | postgres | UTF8 | en_IN | en_IN | Name | Owner | Encoding | Collate | Ctype | Access privileges Step 4: List all databases via \l by using the below command postgres=# \l Step 3: Create a new database called mytest by using the below command postgres=# create database mytest Step 2: Login to the PostgreSQL Database by using the below command sudo -u postgres psqlĬould not change directory to "/root": Permission denied Step 1: Check the OS version by using the below command lsb_release -a PostgreSQL is an open source Object-Relational Database Management System that supports many SQL standards, including foreign keys, triggers, views, and transactions, as well as object-oriented features such as inheritance. To Insert, Update and Delete Data in PostgreSQL on Ubuntu 21.04 Introduction:
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