改变字段长度: ALTER table schema.table_name ALTER column_name set data type VARCHAR(10); call sysproc.admin_cmd('reorg table schema.table_name '); call sysproc.admin_cmd('runstats on table schema.table_name with distribution and indexes all'); 增加字段: ALTER TABLE schema.table_name ADD COLUMN column_name VARCHAR(100) NOT NULL WITH DEFAULT '*';
加注释:
COMMENT ON COLUMN TM_SEAT_ETERM_AUTHORITY.AGENT_AIRLINE
IS '代理航司';