Thread: Conditional Tables Feature on PostGresSQL

Conditional Tables Feature on PostGresSQL

From

"Sanchari Biswas (Shrina)"

Date:

22 October 2021, 16:34:58

Hello,

Is there any existing feature that enables the use of conditional tables on PostGreSQL, specifically the usage of
variables,and implementing those variables in our (complex) queries? 

Thanks,
Sanchari.

Re: Conditional Tables Feature on PostGresSQL

From

Aditya Toshniwal

Date:

25 October 2021, 04:11:13

Hi Sanchari,

You can use the query tool to write anonymous blocks. Else, can you please explain with an example what exactly is the requirement ?

On Fri, Oct 22, 2021 at 10:05 PM Sanchari Biswas (Shrina) <sanchari.shrina@gmail.com> wrote:

Hello,

Is there any existing feature that enables the use of conditional tables on PostGreSQL, specifically the usage of variables, and implementing those variables in our (complex) queries?

Thanks,
Sanchari.

Thanks,

Aditya Toshniwal

pgAdmin Hacker | Software Architect | edbpostgres.com

"Don't Complain about Heat, Plant a TREE"

Re: Conditional Tables Feature on PostGresSQL

From

Sanchari Biswas

Date:

25 October 2021, 04:30:24

Hi Aditya,

Can we use variables in any column and then have (Boolean) constraints over the variables?

Eg. x as a variable value and then corresponding condition (x ≠ 5 || x ≠ 10).

So that this condition is satisfied when queried with values of column (with variable x) other than the above two and the condition converts to actual constant values, and returns tuples with that actual value.

Thanks,

Sanchari.

On Mon, Oct 25, 2021, 12:11 AM Aditya Toshniwal <aditya.toshniwal@enterprisedb.com> wrote:

Hi Sanchari,

You can use the query tool to write anonymous blocks. Else, can you please explain with an example what exactly is the requirement ?

On Fri, Oct 22, 2021 at 10:05 PM Sanchari Biswas (Shrina) <sanchari.shrina@gmail.com> wrote:
Hello,

Is there any existing feature that enables the use of conditional tables on PostGreSQL, specifically the usage of variables, and implementing those variables in our (complex) queries?

Thanks,
Sanchari.

--
Thanks,
Aditya Toshniwal
pgAdmin Hacker | Software Architect | edbpostgres.com
"Don't Complain about Heat, Plant a TREE"

Re: Conditional Tables Feature on PostGresSQL

From

Aditya Toshniwal

Date:

25 October 2021, 04:52:48

Hi Sanchari,

I'm not sure if PostgreSQL provides such a feature, but the closest I can relate it is to generated columns where you can put the expression to be evaluated. It doesn't allow variables but you can use other columns in expresssion - https://www.postgresql.org/docs/12/ddl-generated-columns.html

On Mon, Oct 25, 2021 at 10:00 AM Sanchari Biswas <sanchari.shrina@gmail.com> wrote:

Hi Aditya,

Can we use variables in any column and then have (Boolean) constraints over the variables?
Eg. x as a variable value and then corresponding condition (x ≠ 5 || x ≠ 10).
So that this condition is satisfied when queried with values of column (with variable x) other than the above two and the condition converts to actual constant values, and returns tuples with that actual value.

Thanks,
Sanchari.

On Mon, Oct 25, 2021, 12:11 AM Aditya Toshniwal <aditya.toshniwal@enterprisedb.com> wrote:
Hi Sanchari,

You can use the query tool to write anonymous blocks. Else, can you please explain with an example what exactly is the requirement ?

On Fri, Oct 22, 2021 at 10:05 PM Sanchari Biswas (Shrina) <sanchari.shrina@gmail.com> wrote:
Hello,

Is there any existing feature that enables the use of conditional tables on PostGreSQL, specifically the usage of variables, and implementing those variables in our (complex) queries?

Thanks,
Sanchari.

--
Thanks,
Aditya Toshniwal
pgAdmin Hacker | Software Architect | edbpostgres.com
"Don't Complain about Heat, Plant a TREE"

Thanks,

Aditya Toshniwal

pgAdmin Hacker | Software Architect | edbpostgres.com

"Don't Complain about Heat, Plant a TREE"

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