The string_agg function in PostgreSQL is used to concatenate strings from a group of rows into a single string, with a specified delimiter between the concatenated values. Here is the syntax of the string_agg function: string_agg(expression, delimiter) The expression parameter specifies the column or expression that you want to concatenate, and the delimiter parameter specifies…

array_agg is a PostgreSQL aggregate function that is used to aggregate values from multiple rows into a single array. The syntax for using array_agg is as shown below: SELECT array_agg(column_name) FROM table_name WHERE condition; where column_name is the name of the column whose values you want to aggregate into an array. table_name is the name…

In PostgreSQL, the MIN function is used to find the minimum value of a given set of expressions. The syntax for the MIN function is as shown below: SELECT MIN(expression) FROM table_name; where, expression represents the column name or expression that you want to find the minimum value for, and table_name represents the name of…

The SUM function in PostgreSQL is used to return the sum of values. Here’s the syntax to return the sum of values in a column: SELECT SUM(column_name) FROM table_name; where column_name is the name of the column you want to sum and table_name is the name of the table containing the column. For example, consider…

The AVG function in PostgreSQL is used to calculate the average value of a set of numbers. The basic syntax of the AVG function is as shown below: AVG(expression) In the above syntax, expression represents the column or expression whose average value is to be calculated. Example: To find the average salary of employees in…

The count() function in PostgreSQL is used to count the number of rows in a table or the number of values in a specific column that meet a certain condition. Below is the basic syntax of the count() function: SELECT count(*) FROM table_name; Above query will count the total number of rows in the specified…

In PostgreSQL, the MAX function is used to return the maximum value among a set of values. The syntax of the MAX function is as follows: SELECT MAX(column_name) FROM table_name; column_name is the name of the column from which you want to find the maximum value, and table_name is the name of the table in…