查看当前db2实例中有那些数据库：
db2 list database directory
查看数据库中有那些表：
db2 connect to db_name user xxx using xxxx
db2 list tables
列出用户创建的所有表
db2 list tables for user_name
列出所有schema为xx的表
db2 list tables for schema xxx
查看某个表中的字段情况：
db2 describe table table_name
db2 describe table table_name show detail
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1. 建立数据库DB2_GCB
CREATE DATABASE DB2_GCB ON G: ALIAS DB2_GCB
USING CODESET GBK TERRITORY CN COLLATE USING SYSTEM DFT_EXTENT_SZ 32
2. 连接数据库
connect to sample1 user db2admin using 8301206
3. 建立别名
create alias db2admin.tables for sysstat.tables;
CREATE ALIAS DB2ADMIN.VIEWS FOR SYSCAT.VIEWS
create alias db2admin.columns for syscat.columns;
create alias guest.columns for syscat.columns;
4. 建立表
create table zjt_tables as
(select * from tables) definition only;
create table zjt_views as
(select * from views) definition only;
5. 插入记录
insert into zjt_tables select * from tables;
insert into zjt_views select * from views;
6. 建立视图
create view V_zjt_tables as select tabschema,tabname from zjt_tables;
7. 建立触发器
CREATE TRIGGER zjt_tables_del
AFTER DELETE ON zjt_tables
REFERENCING OLD AS O
FOR EACH ROW MODE DB2SQL
Insert into zjt_tables1 values(substr(o.tabschema,1,8),substr(o.tabname,1,10))
8. 建立唯一性索引
CREATE UNIQUE INDEX I_ztables_tabname
[size=3]ON zjt_tables(tabname);
9. 查看表
select tabname from tables
where tabname='ZJT_TABLES';
10. 查看列
select SUBSTR(COLNAME,1,20) as 列名,TYPENAME as 类型,LENGTH as 长度
from columns
where tabname='ZJT_TABLES';
11. 查看表结构
db2 describe table user1.department
db2 describe select * from user.tables
12. 查看表的索引
db2 describe indexes for table user1.department
13. 查看视图
select viewname from views
where viewname='V_ZJT_TABLES';
14. 查看索引
select indname from indexes
where indname='I_ZTABLES_TABNAME';
15. 查看存贮过程
SELECT SUBSTR(PROCSCHEMA,1,15),SUBSTR(PROCNAME,1,15)
FROM SYSCAT.PROCEDURES;
16. 类型转换(cast)
ip datatype:varchar
select cast(ip as integer)+50 from log_comm_failed
17. 重新连接
connect reset
18. 中断数据库连接
disconnect db2_gcb
19. view application
LIST APPLICATION;
20. kill application
FORCE APPLICATION(0);
db2 force applications all (强迫所应用程序从数据库断开)
21. lock table
lock table test in exclusive mode
22. 共享
lock table test in share mode
23. 显示当前用户所有表
list tables
24. 列出所有的系统表
list tables for system
25. 显示当前活动数据库
list active databases
26. 查看命令选项
list command options
27. 系统数据库目录
LIST DATABASE DIRECTORY
28. 表空间
list tablespaces
29. 表空间容器
LIST TABLESPACE CONTAINERS FOR
Example: LIST TABLESPACE CONTAINERS FOR 1
30. 显示用户数据库的存取权限
GET AUTHORIZATIONS
31. 启动实例
DB2START
32. 停止实例
db2stop
33. 表或视图特权
grant select,delete,insert,update on tables to user
grant all on tables to user WITH GRANT OPTION
34. 程序包特权
GRANT EXECUTE
ON PACKAGE PACKAGE-name
TO PUBLIC
35. 模式特权
GRANT CREATEIN ON SCHEMA SCHEMA-name TO USER
36. 数据库特权
grant connect,createtab,dbadm on database to user
37. 索引特权
grant control on index index-name to user
38. 信息帮助 (? XXXnnnnn )
例:? SQL30081
39. SQL 帮助(说明 SQL 语句的语法
help statement
例如，help SELECT
40. SQLSTATE 帮助(说明 SQL 的状态和类别代码)
? sqlstate 或 ? class-code
41. 更改与"管理务器"相关的口令
db2admin setid username password
42. 创建 SAMPLE 数据库
db2sampl
db2sampl F:(指定安装盘)
43. 使用操作系统令
! dir
44. 转换数据类型 (cast)
SELECT EMPNO, CAST(RESUME AS VARCHAR(370))
FROM EMP_RESUME
WHERE RESUME_FORMAT = 'ascii'
45. UDF
要运行 DB2 Java 存储过程或 UDF，还需要更新服务器上的 DB2 数据库管理程序配置，以包括在该机器上安装 JDK 的路径
db2 update dbm cfg using JDK11_PATH d:sqllibjavajdk
TERMINATE
update dbm cfg using SPM_NAME sample
46. 检查 DB2 数据库管理程序配置
db2 get dbm cfg
47. 检索具有特权的所有授权名
SELECT DISTINCT GRANTEE, GRANTEETYPE, 'DATABASE' FROM SYSCAT.DBAUTH
UNION
SELECT DISTINCT GRANTEE, GRANTEETYPE, 'TABLE ' FROM SYSCAT.TABAUTH
UNION
SELECT DISTINCT GRANTEE, GRANTEETYPE, 'PACKAGE ' FROM SYSCAT.PACKAGEAUTH
UNION
SELECT DISTINCT GRANTEE, GRANTEETYPE, 'INDEX ' FROM SYSCAT.INDEXAUTH
UNION
SELECT DISTINCT GRANTEE, GRANTEETYPE, 'COLUMN ' FROM SYSCAT.COLAUTH
UNION
SELECT DISTINCT GRANTEE, GRANTEETYPE, 'SCHEMA ' FROM SYSCAT.SCHEMAAUTH
UNION
SELECT DISTINCT GRANTEE, GRANTEETYPE, 'SERVER ' FROM SYSCAT.PASSTHRUAUTH
ORDER BY GRANTEE, GRANTEETYPE, 3
create table yhdab
(id varchar(10),
password varchar(10),
ywlx varchar(10),
kh varchar(10));
create table ywlbb
(ywlbbh varchar(8),
ywmc varchar(60))
48. 修改表结构
alter table yhdab ALTER kh SET DATA TYPE varchar(13);
alter table yhdab ALTER ID SET DATA TYPE varchar(13);
alter table lst_bsi alter bsi_money set data type int;
insert into yhdab values
('20000300001','123456','user01','20000300001'),
('20000300002','123456','user02','20000300002');
49. 业务型说明
insert into ywlbb values
('user01','业务申请'),
('user02','业务撤消'),
('user03','费用查询'),
('user04','费用自缴'),
('user05','费用预存'),
('user06','密码修改'),
('user07','发票打印'),
('gl01','改用户基本信息'),
('gl02','更改支付信息'),
('gl03','日统计功能),
('gl04','冲帐功能'),
('gl05','对帐功能'),
('gl06','计费功能'),
('gl07','综合统计')