How can I CAST a numeric column to a NUMERIC with different precision and/or scale?

smontiel

As part of integrating a new system we're focusing on dumping the information as PARQUET files but found out there is a limitation on precision and scale for NUMERIC fields. We thought about casting but can't figure out the syntax correctly and couldn't find anything online beyond altering the values in the table with an add/alter dance

Jim_Knicely

Like this?

dbadmin=> \d t
                                    List of Fields by Tables
 Schema | Table | Column |     Type      | Size | Default | Not Null | Primary Key | Foreign Key
--------+-------+--------+---------------+------+---------+----------+-------------+-------------
 public | t     | c      | numeric(10,5) |    8 |         | f        | f           |
(1 row)

dbadmin=> SELECT c, c::NUMERIC(7, 2) FROM t;;
      c      |    c
-------------+----------
 10021.23212 | 10021.23
   102.22823 |   102.23
     0.23100 |     0.23
(3 rows)

smontiel

Thanks! I was using the CAST and didn't think about changing the format