问题
As in subject... is there a way of looking at an empty table schema without inserting any rows and issuing a SELECT?
回答1:
Are you looking for DESCRIBE?
db2 describe table user1.department
Table: USER1.DEPARTMENT
Column Type Type
name schema name Length Scale Nulls
------------------ ----------- ------------------ -------- -------- --------
AREA SYSIBM SMALLINT 2 0 No
DEPT SYSIBM CHARACTER 3 0 No
DEPTNAME SYSIBM CHARACTER 20 0 Yes
回答2:
SELECT *
FROM SYSIBM.SYSCOLUMNS
WHERE
TBNAME = 'tablename';
回答3:
For DB2 AS/400 (V5R4 here) I used the following queries to examine for database / table / column metadata:
SELECT * FROM SYSIBM.TABLES -- Provides all tables
SELECT * FROM SYSIBM.VIEWS -- Provides all views and their source (!!) definition
SELECT * FROM SYSIBM.COLUMNS -- Provides all columns, their data types & sizes, default values, etc.
SELECT * FROM SYSIBM.SQLPRIMARYKEYS -- Provides a list of primary keys and their order
回答4:
Looking at your other question, DESCRIBE may not work. I believe there is a system table that stores all of the field information.
Perhaps this will help you out. A bit more coding but far more accurate.
来源：https://stackoverflow.com/questions/153769/how-to-see-the-schema-of-a-db2-table-file