Postgres function loop through rows

How to reference data from next row? WITH is part of a SELECT statement and cannot be mixed with plpgsql control structures like LOOP or IF. Function to loop through and select. Sometimes, you need to execute a block of statements repeatedly until a condition becomes true. Loops, like conditional statements, are another method of controlling the flow of functions.

Now i ask: how can I iterate through a recordset and print something, suppose the entire record ( or better its fields) ? To: pgsql-sql(at)postgresql(dot)org Subject: looping through of a SELECT. Inside the function , we query all films whose release year equals to the released year passed to the function. We use the cursor to loop through the rows and concatenate the title and release year of film that has the title contains the ful word. Because we want to process each individual row before returning it, we use FOR LOOP statement. PostgreSQL returns a table with one column that holds the array of films.

This variable will be used to store the rows coming from the query in the main body of the function. The main body does a loop over the group by query stated setting r to each row in sequence. I want to append to rec so that rec becomes a set of rows when the loop is over, which I can just RETURN at the end of my function.

Currently, I am doing this - SELECT temp_table. INTO rec FROM temp_table WHERE temp_table. I have simple table for the sake of argument.

The COUNT() function is an aggregate function that allows you to get the number of rows that match a specific condition of a query. The following statement illustrates various ways of using the COUNT() function. In practice, you often process each individual row before appending it in the function’s result set. A more interesting usage is to return a reference to a cursor that a function has create allowing the caller to read the rows.

There is a variant of the FOR statement that allows iterating through the rows returned by a cursor. SQL is a language where one task can be solved multiple ways with different efficiency. Hi, I am trying to loop through the records in a table and update a column. I can do this with a case statement but I would like to simplify this to a simple loop statement.

Andrew - Supernews Looping over rows unnecessarily is a mistake. The key would be a table name and the value would be a sql statement or a value. How do I initialize the array? I need a list of key value pairs. Hi, Why is it only possible to store one row by a query which returns multiple rows using the SELECT INTO statement.

While a specified condition is True, repeat the execution of a statement. If condition is always False, the body of statement is never executed. Using the FOR loop with ROWTYPE.

Generally, plpgsql code is always wrapped into a BEGIN. Here is a function that loops through membership records. Has any one been able to get something similar to this working?

Is there any additional documentation on plpgsql? POSTGIS intersection does not support the processing of multiple geometries natively, differently from ST_Intersects() and I had to design a function (returning a table) that selects rows intersecting with my clipper_geom using ST_Intersects(), loop through the result set and compute each intersection with ST_Intersection(). Both stored procedures and user-defined functions are created with CREATE FUNCTION statement in PostgreSQL.

This article lists out extensive list of example scripts for looping through table records one row at a time. This article covers the examples for the following scenario’s for looping through table rows.