How do I loop through an array in PostgreSQL?

How do I loop through an array in PostgreSQL?

The FOREACH statement to loop over an array is: [ <> ] FOREACH target [ SLICE number ] IN ARRAY expression LOOP statements END LOOP [ label ]; Without SLICE, or if SLICE 0 is specified, the loop iterates through individual elements of the array produced by evaluating the expression.

How do you write a loop in PostgreSQL?

The syntax of the for loop statement to iterate over a result set of a dynamic query: [ <> ] for row in execute query_expression [ using query_param [, ] ] loop statements end loop [ label ];

How do you iterate through an array in SQL?

Solution

1. Use DATABASENAME.
2. GO.
3. DECLARE @PRODUCTDETAILSTABLE table (PRODUCTNAME nvarchar(100), PRODUCTID int, PRODUCTCOST int)
4. — Declare your array table variable.
5. DECLARE @MYARRAY table (TEMPCOL nvarchar(50), ARRAYINDEX int identity(1,1) )

Can we use for loop in PostgreSQL?

Using PL/pgSQL for loop to iterate over a range of integers First, the for loop creates an integer variable loop_counter which is accessible inside the loop only. By default, the for loop adds the step to the loop_counter after each iteration.

Can you do loops in PostgreSQL?

Procedural elements like loops are not part of the SQL language and can only be used inside the body of a procedural language function, procedure (Postgres 11 or later) or a DO statement, where such additional elements are defined by the respective procedural language.

How do you exit a loop in PostgreSQL?

There is no BREAK in PL/pgSQL.

1. EXIT terminates the loop.
2. CONTINUE continues at the next iteration of the loop. You can attach a <> to loops and add it as parameter to each of these commands. Then you terminate / continue the labeled loop.
3. RETURN exits from the function (so not applicable in a DO statement).

How to loop with array of values in pgSQL?

Can we use RETURN QUERY within this loop to display all values from UserResponseList instead of RAISE NOTICE? can we use return query within this loop …? CREATE OR REPLACE FUNCTION f_pivot_arrays () RETURNS TABLE (question text, response_id int, response text) AS $func$ DECLARE QuestionList text [] := ‘ {Who?,When?,WHY?}’;

How to use array loop in PostgreSQL stack overflow?

You don’t need a loop for that, you could use unnest to convert the array from string_to_array into a set of rows and then use a simple insert select construct:

What does end loop mean in PostgreSQL for loop?

The statements that we want to execute on a repetitive basis are included in the [code/statements to repeat] section, and END LOOP marks the ending of the for loop working. REVERSE is the optional parameter which, when specified, the counting variable will be decremented while iterating instead of incrementing each time the iteration is done.

How to print a table in PostgreSQL for loop?

So, after copying and pasting the above function in your psql command prompt, a function named displayTable will be created if CREATE FUNCTION is displayed at the end. Now, to print the table, we will have to call the function displayTable () in the following way: