Re: Help to find-the-maximum-length-of-field-in-a-particular-column-in-allthe tables

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On Thursday, April 2, 2020, postgann2020 s <postgann2020@gmail.com> wrote:

Hi Team,

Good Evening,

We are trying to syncing the table field size with other db tables filed size.

I wouldn’t bother fiddling with arbitrary sizes, just remove,them.

 

We have multiple tables in multiple schemas in DB. we are tyring to findout maximum size of each column in table for all tables and for all schemas in DB. 

You need to decide whether you want to query table data or catalog (schema) data.

 

I have tried below query, but not able to get desired output.

SELECT (select column_name from INFORMATION_SCHEMA.COLUMNS where table_name='building'), select max(length(select column_name from INFORMATION_SCHEMA.COLUMNS where table_name='building')) from from INFORMATION_SCHEMA.COLUMNS where table_name='building'
group by column_name;

 

If you want to dynamically determine tables and columns while still checking the actual table data you will need to create a dynamic sql statement to query the actual table with the content for the dynamic schema parts being populated by a query against information_schema or the catalog.  You’d need you something besdies pure sql (e.g., pl/pgsql) to do this.  You may find it easier to just brute force things.

David J.