DB2表中列的说明

Question

我们如何通过SQL了解表(DB2)中每个列的描述？

我的数据库是DB2.

Answer 1

select 
  tabname,
  colname,
  typename,
  length,
  scale,
  default,
  nulls,
  identity,
  generated,
  remarks,
  keyseq 
from 
  syscat.columns 

Answer 2

SELECT 
TABLE_CAT, 
TABLE_SCHEM, 
TABLE_NAME, 
COLUMN_NAME, 
DATA_TYPE, 
TYPE_NAME, 
COLUMN_SIZE, 
COLUMN_TEXT
FROM "SYSIBM"."SQLCOLUMNS"
WHERE TABLE_SCHEM = 'SCHEMA' 
 AND TABLE_NAME = 'TABLE'

这是在DB2 V5R4上,并不是系统表而是SYSTEM VIEW.如果您坚持在表格列表中寻找它.

Answer 3

- 注意:where子句区分大小写,需要为大写

select
t.table_schema as Library
,t.table_name
,t.table_type
,c.column_name
,c.ordinal_position
,c.data_type
,c.character_maximum_length as Length
,c.numeric_precision as Precision
,c.numeric_scale as Scale
,c.column_default
,t.is_insertable_into
from sysibm.tables t
join sysibm.columns c
on t.table_schema = c.table_schema
and t.table_name = c.table_name
where t.table_schema = 'MYLIB'
and t.table_name = 'MYTABLE'
order by t.table_name, c.ordinal_position

- 获取所有元表的列表:

select * from sysibm.tables
where table_schema = 'SYSIBM'