The GROUP BY clause and SUM() function are used together when we want to calculate the sum of values based on the specific groups.
24x7, 365 Enterprise services since 1997
Command Prompt, Inc., is the oldest Postgres Company in North America and one of the oldest Open Source firms still operating today. We serve our clients with best in class expertise and professionalism. You can read more about support and services here:
You have landed at the largest single source of Postgres education blogs in the world. At Command Prompt, we believe deeply that the education of the community is critical to the continued success of Postgres and related technologies. We hope you find content you are looking for and don't hesitate to Contact us today for all your Postgres and Open Source consulting and support needs.
The GROUP BY clause and SUM() function are used together when we want to calculate the sum of values based on the specific groups.
In PostgreSQL, the extensions can be created by using the CREATE EXTENSION statement which is followed by the name of the extension.
In PostgreSQL, the log functions are used to find the logarithm of a particular number(provided in the function as a parameter). These functions include: log(), ln(), and log10().
In PostgreSQL, the extensions can be dropped by using the DROP EXTENSION statement which is followed by the name of the extension.
We can switch a user in PostgreSQL by simply executing the SET ROLE command. But the point to be noted is that we can only switch the user if it already exists.
The generated columns do not have a fixed value; rather this value is automatically computed by the expression that is determined at the time of column definition.
In PostgreSQL, the crosstab() function and the unnest() function are used to transpose columns into rows. These functions help us transform the table by returning the transposed table.
To get random rows from a database table, use the RANDOM() function with the ORDER BY clause. We can also specify the limit of the number of rows we want to fetch/retrieve.
The lcm() and gcd() functions take two numeric type parameters and return their lowest common factor and the greatest common divisor respectively.
To get the data between two specified date ranges, use the “WHERE” and “AND” clauses, the BETWEEN operator, the SYMMETRIC keyword, and the Range data types.