Postgres and Open Source Experts

The json_populate_recordset() function converts the JSON array into a set of data rows. The JSON array can contain multiple JSON objects, which can be converted into arrays by using it.

Use the pi() function in PostgreSQL to get the mathematical constant value of π. pi() can be used in mathematical expressions to use the value of π.

PL/pgSQL supports block structure. The block has two sections; a declaration and a body. Sub-block structure is also supported by PL/pgSQL.

In PostgreSQL, the full-text search returns all the possible results for the searched terms and their variants as well which was a drawback of the simple search approach.

SELECT if String Contains a Substring Match in PostgreSQL can be accomplished using different methods, such as LIKE and ILIKE, position(), substring(), etc.

In Postgres, the UNION, INTERSECT, and EXCEPT are the set operators that are applied on at least two tables to get a specific combined result.

In PostgreSQL, the UPDATE FROM statement is used to update the data/row of any table according to the data of another table.

Commenting on the special character in psql may be a problem sometimes. To avoid errors we can use different methods, such as \echo, \warn, “\\” separator, etc.

In PostgreSQL, the error “window function nth_value requires an OVER clause” occurs when the OVER clause is not specified in the query.

In PostgreSQL, an already existing user-defined data type that is no longer in our use can be dropped by using the DROP TYPE IF EXISTS statement.