How to make the generate_series to generate the letter series?

2023年5月29日(月) 12:39 Wen Yi <896634148@qq.com>:

Hi team,
when I study the generate_series function, I found that it can not only generate the number series but also can generate the date series.(ref: https://www.postgresql.org/docs/current/functions-srf.html)
That means I can make the generate_series to generate the letter series.

So I try this command (I guess I can follow the ascil code rule to complete this work):

# SELECT * FROM generate_series('a'::int, 'z'::int, 1);

But the postgres reply me a error, because the 'a' can't translate into 'integer' type.

Can someone provide me a better solution?
Thanks in advance!

SELECT chr(x + 96) FROM generate_series(1, 26) x

Regards

Ian Barwick

On Mon, May 29, 2023 at 12:51:15PM +0900, Ian Lawrence Barwick wrote:

2023年5月29日(月) 12:39 Wen Yi <896634148@qq.com>:

Hi team,
when I study the generate_series function, I found that it can not only generate the number series but also can generate the date series.(ref: https://www.postgresql.org/docs/current/functions-srf.html)
That means I can make the generate_series to generate the letter series.

So I try this command (I guess I can follow the ascil code rule to complete this work):

# SELECT * FROM generate_series('a'::int, 'z'::int, 1);

But the postgres reply me a error, because the 'a' can't translate into 'integer' type.

Can someone provide me a better solution?
Thanks in advance!

SELECT chr(x + 96) FROM generate_series(1, 26) x

A working example is:

SELECT chr(x + 96) FROM generate_series(1, 26) as f(x);

Here is a blog entry about more complex examples:

https://momjian.us/main/blogs/pgblog/2012.html#July_24_2012

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EDB https://enterprisedb.com

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