how to get column size and type through my database in PostgreSQL

Question

I've changed column length manually in my previous database.

But after creating new database via HQL it's creating varchar(255) and I need to make it longer.

I need to find which table's column should I change?

I can find it manually but now I have about 200 tables and I need a query to do this.

How can I get the column type and its length in Postgres using a SQL query?

Answer 1

The INFORMATION_SCHEMA tables will help you here:

select * from INFORMATION_SCHEMA.COLUMNS 

You can examine the table_name, column_name, data_type and character_maximum_length columns in the result set.