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Alias in PostgreSQL With Examples

ALIASES are used in Postgres to provide a temporary name to the columns, tables, etc., while executing/writing Postgres queries.

How to Fix Column Does not Exist Exception/Error in PostgreSQL

In Postgres, the “column doesn’t exist” error occurs because of various reasons, such as the searched column doesn’t exist, typo mistakes, column alias being used incorrectly, etc.

How to Define an Auto Increment Primary Key in PostgreSQL

To define an auto-incremented primary key in Postgres, specify a column name followed by a pseudo data type named “SERIAL”, and then specify the PRIMARY KEY keyword.

ARRAY_TO_STRING() Function in PostgreSQL

PostgreSQL offers an ARRAY_TO_STRING() function that accepts three arguments: an array, a delimiter, and a text to replace the null values.

PostgreSQL TRUNC() VS ROUND() Function

The TRUNC() function trims the whole fractional part or up to specified precision, while the ROUND() function rounds the input number to the nearest integer/specified fractional places.

String Arrays in PostgreSQL

PostgreSQL allows us to create a string array using one of three data types: CHAR, VARCHAR, and TEXT. Once an array is created, various operations can be performed on that array.

ARRAY_REMOVE() Function in PostgreSQL

ARRAY_REMOVE() function accepts an array and a specific number as arguments and deletes all the occurrences of that particular number from the input array.

How to Update Multiple Rows in PostgreSQL

In PostgreSQL, the UPDATE statement must be executed with the semi-colon-separated syntax to modify multiple rows with different values.

ARRAY_REPLACE() Function in PostgreSQL

The ARRAY_REPLACE() is an inbuilt array function in Postgres that allows us to replace all the occurrences of an array element with a new element.

Wildcards in PostgreSQL With Practical Examples

Pattern matching in PostgreSQL is performed using wildcards. PostgreSQL offers two wildcards represented with a percentage sign “%” and an underscore sign “_”.