List table columns in Db2 database

Query below lists all table columns in a database.

Query

Select c.tabschema as schema_name,
       c.tabname as table_name, 
       c.colname as column_name,
       c.colno as position,
       c.typename as data_type,
       c.length,
       c.scale,
       c.remarks as description,   
       case when  c.nulls = 'Y' then 1 else 0 end as nullable,
       default as default_value,
       case when c.identity ='Y' then 1 else 0 end as is_identity,
       case when c.generated ='' then 0 else 1 end as  is_computed,
       c.text as computed_formula
from syscat.columns c
inner join syscat.tables t on 
      t.tabschema = c.tabschema and t.tabname = c.tabname
where t.type = 'T'
order by schema_name,
         table_name

Columns

  • schema_name - schema name
  • view_name - table name
  • column_name - column name
  • position - number of this column in the table (starting with 0)
  • data_type - name of the data typ
  • 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
  • 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 one table column
  • Scope of rows: all columns in all tables in a database
  • Ordered by schema, table name, column id

Sample results

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