Can we use loop in PostgreSQL?

Can we use loop 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 I loop a record in PostgreSQL?

1 Answer. Show activity on this post. CREATE OR REPLACE FUNCTION loop_fetch() RETURNS void AS $BODY$ DECLARE myrow student_list%rowtype; cur1 CURSOR FOR SELECT * FROM student_list ; rows int DEFAULT 0; BEGIN LOOP — i need to fetch rows based on limit FOR myrow IN cur1 LOOP INSERT INTO new_tbl SELECT myrow.

How do I create a loop in PostgreSQL?

The syntax of the for loop statement to iterate over a range of integers: [ <> ] for loop_cnt in [ reverse ] from.. to [ by step ] loop statements end loop [ label ]; If we analyse the above syntax: An integer variable loop_cnt is created at first, which is accessible inside the loop only.

Do while loops PostgreSQL?

The PostgreSQL WHILE LOOP evaluates the condition defined to decide whether the loop should be terminated or continued for execution. If the condition defined with PostgreSQL WHILE LOOP evaluates to true, then the body of WHILE LOOP or code statements are written inside the PostgreSQL WHILE LOOP is executed.

How do I use coalesce in PostgreSQL?

In PostgreSQL, the COALESCE function returns the first non-null argument. It is generally used with the SELECT statement to handle null values effectively. Syntax: COALESCE (argument_1, argument_2, …); The COALESCE function accepts an unlimited number of arguments.

What is raise notice in PostgreSQL?

RAISE is used to raise errors and report messages, PostgreSQL provides various parameters to report an error, warning, and information at a detailed level.

What is Nullif in PostgreSQL?

The nullif() function returns a null value, if a the value of the field/column defined by the first parameter equals that of the second. Otherwise, it will return the original value.

What are different types of loops available in PL pgSQL?

5. Simple Loops. With the LOOP , EXIT , CONTINUE , WHILE , FOR , and FOREACH statements, you can arrange for your PL/pgSQL function to repeat a series of commands.

Why we use coalesce in PostgreSQL?

How do I return multiple result sets in PostgreSQL?

Linked

1. PostgreSQL function returning multiple DIFFERENT datasets.
2. Postgres function: return multiple tables.
3. Accessing the Return Table in a Postgres Function.
4. Pass array of tags to a plpgsql function and use it in WHERE condition.
5. Using results from PostgreSQL query in FROM clause of another query.

What is the maximum row size in PostgreSQL?

Table K.1. PostgreSQL Limitations

How do I concatenate strings in PostgreSQL?

The PostgreSQL concat() function is used to concatenate two or more strings except NULL specified in the arguments.

1. Syntax: concat(,[,,… ])
2. Example: PostgreSQL CONCAT() function:
3. Example of PostgreSQL CONCAT() function with NULL :
4. Example of PostgreSQL CONCAT() function using column :