Need a reporting tool for PostgreSQL? Ubiq makes it easy to visualize data in minutes, and monitor in real-time dashboards. Hopefully, this article will help you concatenate columns in PostgreSQL, concatenate string and variable, or concatenate string and int. Here is an example to concatenate first_name and last_name columns with null value postgres=# select concat(first_name,null,last_name) as full_nameĪs you can see, concat function has converted null values into empty strings. PostgreSQL has a concat () function which takes multiple strings and combines them into single-string values. postgres-# select concat(first_name,' ',last_name) as full_nameĪlso read : How to Change User Password in PostgreSQL Here is an example to concatenate first_name and last_name column above using concat function. The substring is a string beginning at 8, which. See the following picture: In the second statement, we extract a substring started at position 8 and we omit the length parameter. The key difference between || operator and concat function is that, if any of the values in concat function is null, it is automatically converted into an empty string during concatenation. In the first statement, we extract a substring that has length of 8 and it is started at the first character of the PostgreSQL string. These parameters can be strings, columns, int, null, etc. postgres-# select first_name || null || last_name as full_nameįor that purpose, we need to use concat function, which is described below.Īlso read : How to Compare Arrays in PostgreSQLĬoncat function also allows you to concatenate strings, columns and int. If there is null in any of the column or string, then the result is a null value. However, || operator cannot concatenate null values. select first_name || 123 || last_name as full_nameĪs you can see || operator automatically converts int to string while concatenating. You can even concatenate string with int using || operator. postgres-# select first_name || ' ' || last_name as full_name Here is the SQL query to concatenate columns first_name and last_name using || operator. Postgres=# insert into employees(id,first_name,last_name)Īlso read : How to Update Multiple Columns in PostgreSQL Let us say you have a table employees(id, first_name, last_name) postgres=# create table employees(id int, PostgreSQL allows you to directly concatenate strings, columns and int values using || operator. There are two ways to concatenate strings in PostgreSQL – using || operator and using concat function. You can use it to concatenate columns in PostgreSQL, concatenate string and variable, or concatenate string and int. In this article, we will look at how to concatenate strings in PostgreSQL using each of these approaches. PostgreSQL offers two ways to concatenate strings.

PostgreSQL allows you to easily concatenate columns, strings and int.

Postgresql concat