ARRAY_POSITIONS function returns the positions of all occurrences of an array element. Here is the basic syntax of using the ARRAY_POSITIONS function.
SELECT ARRAY_POSITIONS(array[2,1,3,1,2],1);
Above sql returns 2,4 as the output as element ‘1’ occurred in both 2nd and 4th position.
The unnest function in PostgreSQL is used to transform an array or a set of values into a set of rows. This is particularly useful when you have a column that stores arrays or sets and you want to work with the individual elements within those arrays as separate rows. Below is the basic syntax…
The array_to_string function is used to convert an array of elements into a single string in PostgreSQL database by concatenating the elements together with a specified delimiter. Here is the syntax for the array_to_string function: array_to_string(array_expression, delimiter) where array_expression is the array that you want to convert into a string. and delimiter is the delimiter…
The string_to_array function is used to split a string into an array of substrings based on a specified delimiter. It takes a string as input and returns an array of text elements as output. Below is the syntax for the string_to_array function: string_to_array(input_string, delimiter) where input_string is the string that you want to split into…
The cardinality function in PostgreSQL is used to determine the number of elements in an array. It returns an integer value representing the size or length of the array. The cardinality function is particularly useful when you need to find out how many elements are in an array so that you can perform various calculations…
The array_length function is used to determine the length (number of elements) of a one-dimensional array in PostgreSQL. This function takes two arguments – the array and the dimension for which you want to find the length. Here’s the syntax of the array_length function: array_length(array_expression, dimension) Where: array_expression is the array for which you want…
The array_fill function in PostgreSQL is used to create an array of a specified dimension and fill it with a specified value. This function is useful when you want to generate arrays with a specific structure and initialize all elements to a common value. Below is the syntax for the array_fill function: array_fill(value, dimensions) value…