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How to Create Generate_series Function In Postgresql?

2 minutes read

To create a generate_series function in PostgreSQL, you will need to define a function that uses a query to generate a series of numbers or dates. This query typically uses the generate_series function provided by PostgreSQL to generate the desired series. You can customize the function to specify the start and end values of the series, as well as the increment or interval between values. By creating a generate_series function, you can easily generate a series of numbers or dates for various purposes within your PostgreSQL database environment.


What is the maximum depth of recursion allowed with the generate_series function?

The maximum depth of recursion allowed with the generate_series function in Postgres is 1000. This means that the function can be called recursively up to a depth of 1000 levels before an error is thrown.


How to use the generate_series function with custom start and end values?

The generate_series function in PostgreSQL is used to generate a series of integer values. By default, it starts at 1 and ends at the specified value. However, it is also possible to specify custom start and end values.


To use the generate_series function with custom start and end values, you can use the following syntax:

1
2

SELECT * 
FROM generate_series(start_value, end_value) num;


Replace start_value and end_value with the desired custom values. For example, if you want to generate a series of numbers from 5 to 10, you can use the following query:

1
2

SELECT * 
FROM generate_series(5, 10) num;


This will generate a series of numbers from 5 to 10:

1
2
3
4
5
6
7
8

num
---
5
6
7
8
9
10



What data types can be used with the generate_series function in PostgreSQL?

The generate_series function in PostgreSQL can be used with the following data types:

  1. Integer
  2. BigInt
  3. SmallInt
  4. Numeric
  5. Timestamp
  6. Date


These data types can be used to generate a series of values within specified ranges or intervals.

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