Postgres and Open Source Experts

In PostgreSQL, “LASTVAL()” is a built-in function that retrieves the most recently generated sequence value of the current session.

In PostgreSQL, the ALTER TABLE statement is used with ADD IDENTITY or DROP IDENTITY to add or remove an IDENTITY column to a Postgres table.

PostgreSQL 10 introduced a new feature named the "IDENTITY" column, which allows us to create a table’s column with auto-incrementing values.

In PostgreSQL, the SUM() function can be executed with the GROUP BY clause to compute the sum of a particular column grouped by single or multiple columns.

To increase maximum connections in PostgreSQL, open the configuration file, locate the “max_connections” variable in that file, and increase its value according to your needs.

Use the sequence option to specify the start value and the increment value for an IDENTITY column in PostgreSQL.

In PostgreSQL, “CURRVAL()” is a built-in function that returns the most recently retrieved value of the NEXTVAL() function for a specific sequence in the current session.

Yes! A SERIAL column can be overridden by the user by explicitly specifying the column name and corresponding value in the INSERT statement.

In PostgreSQL, to fix the “START value can’t be less than MINVALUE” error, make sure that the starting value of the sequence is equal to or greater than the MINVALUE.

In PostgreSQL, the “currval of sequence is not yet defined in this session” error occurs when the NEXTVAL() function is invoked before the CURRVAL() function.