PostgreSQL – How to List All Installed Extensions

To remove special characters from a string in PostgreSQL, you can use a combination of string manipulation functions like REGEXP_REPLACE and regular expressions to target and replace those characters. Here’s an example of how you can remove special characters from a string: Suppose you have a table named “my_table” with a column “my_column” containing strings…

You can convert a string to a date using the TO_DATE function in PostgreSQL. This function allows you to specify the input string, the format of the string, and it will return a date accordingly. The general syntax of the TO_DATE function is as follows: TO_DATE(input_string, format_string) Here’s an example of using SELECT TO_DATE(‘2023-08-31’, ‘YYYY-MM-DD’);…

To list views in a PostgreSQL database, you can use SQL queries to query the system catalog tables. Specifically, you can query the pg_views catalog table to retrieve information about the views in the database. Here’s how you can do it: SELECT table_name FROM information_schema.views WHERE table_schema = ‘public’; where This query will return a…

To drop a NOT NULL constraint from an existing column in a PostgreSQL table, you can use the ALTER TABLE statement with the ALTER COLUMN clause. Here’s the basic syntax: ALTER TABLE table_name ALTER COLUMN column_name DROP NOT NULL; where table_name is the name of the table containing the column and column_name is the name…

Below is the syntax to create a table in PostgreSQL. CREATE TABLE table_name ( column1 datatype1, column2 datatype2, … ); where table_name is the name you want to give to the new table. and column1, column2, etc.: specifies the names of the columns you want to create in the table. and datatype1, datatype2, etc.: specifies…

To change a user’s password in PostgreSQL, you can use the ALTER USER statement. Here’s how you can change a user’s password: Connect to PostgreSQL: You need to connect to your PostgreSQL server using a user account with superuser or administrative privileges, as only superusers can change the passwords of other users. Change the Password:To…