List all columns in specific table in Db2 database

Query below returns a list of all columns in a specific table in IBM DB2 database.

Query

select colno as position,
       colname as column_name,
       typename as data_type,
       length,
       scale,
       default,
       remarks as description, 
       case when nulls='Y' then 1 else 0 end as nullable,
       case when identity ='Y' then 1 else 0 end as is_identity,
       case when generated ='' then 0 else 1 end as  is_computed,
       text as computed_formula
from syscat.columns
where tabname = 'PROJECT'            -- enter table name here
      --and tabschema = 'schema name'
order by colno;

Columns

  • position - number of this column in the table (starting with 0)
  • column_name - name of a column in a table
  • data_type - type of column data
  • length - maximum length of the data; 0 for distinct types.
  • scale -
    • scale if the column type is DECIMAL,
    • number of digits of fractional seconds if the column type is TIMESTAMP,
    • 0 otherwise
  • default - default expression of the colum
  • description - description of column
  • nullable - nullability attribute for the column
  • is_identity - identity attribute for the column
  • is_computed - computed (generated) attribute for the column
  • computed_formula - the text of the computed column expression

Rows

  • One row represents a single column
  • Scope of rows: represent all columns in a named table
  • Ordered by column's ordinal position in table

Sample results

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