To retrieve a list of all schemas in a PostgreSQL database, you can use the following SQL query:
SELECT schema_name FROM information_schema.schemata;This query queries the information_schema.schemata view, which contains information about all the schemas in the current database. When you execute this query, it will return a list of schema names present in the current database.
The gen_random_uuid() function is used to generate a random UUID (Universally Unique Identifier) in PostgreSQL database. UUIDs are 128-bit identifiers that are often used as unique keys in database tables or for generating random values. Here’s how you can use gen_random_uuid() to generate a random UUID in PostgreSQL: SELECT gen_random_uuid(); When you execute above SQL…
To create a new user in PostgreSQL, you can use the CREATE USER SQL command. Below is the basic syntax: CREATE USER username [WITH PASSWORD ‘password’]; where username is the desired username for the new user, and [WITH PASSWORD ‘password’] is optional. If you include the password, the user will be created with that password….
The log_rotation_size parameter determines the size at which PostgreSQL’s log files (usually the log file generated by the pg_log system) will be rotated or switched to a new file. Rotating log files helps postgresql database engine to manage the log file size and prevent them from growing too large, which can be particularly useful for…
To get the first day of the month from a date in PostgreSQL, you can use the DATE_TRUNC function. Here’s an example: SELECT DATE_TRUNC(‘month’, your_date_column) AS first_day_of_month FROM your_table; where your_date_column is the name of your date column and your_table is the name of your table. This query will return the first day of the…
A schema is a way to organize database objects, such as tables, views, functions, and more, into separate namespaces within a PostgreSQL database. Schemas help you group related objects together and avoid naming conflicts. Here’s how you can create a schema in PostgreSQL: CREATE SCHEMA schema_name; Replace schema_name with the name you want to give…
To convert a date to an integer in PostgreSQL, you can use the TO_CHAR function to format the date as a string and then cast it to an integer. Here’s an example: SELECT CAST(TO_CHAR(your_date_column, ‘YYYYMMDD’) AS INTEGER) AS date_integer FROM your_table; where The TO_CHAR function is used to format the date as a string with…