db2 数据库常用操作

连接数据库：

    db2 connect to <database_name> user <db2_userID> using <db2Password>

查看当前连接哪个库：

    db2 get connection state

查看node：

    db2 list node directory

查实例：

   db2ilist

查看系统数据库：
    db2 list db directory

编目节点：

    db2 catalog tcpip node node_name remote server_ip server server_port

编目数据库

    db2 catalog db db_name as db_alias at node node_name

查：

    select   count(*)  from TBL

    select * from TBL

    describe table  TBL

    select * from TBL where  ...

插：

    insert into TBL (activity_id)  values ("111")

删：

    delete from TBL where .....

更新：

    update TBL  set  列 = 值，  where 列 = 值

修改列名称：

    alter table "table_name" rename column "column1" to "column2"

复制表结构：

    create table table_name_new as (select * from table_name_old) definition only

删除表：

    drop table table_name

显示当前schema：

    values current schema

修改当前schema：

    set current schema = 'ac_onlde'

创建schema：

    db2 "create schema test"

查看某schema下的所有表

    db2 list tables for schema xxx

导入ixf表：

    db2 import from table_name.ixf of ixf modified by forcecreate commitcount 1000 replace_create into table_name

导出ixf 可以写shell脚本

select   *   from  tablename  fetch  first   n   rows   only (取前n条数据)

 

select ACQ_INS_ID_CD,ACQ_INS_NM fromTBL_ACMGM_QRC_ACQ_INF order by ACQ_INS_ID_CD （排序）（desc
降序）

 

select * from ( selectACQ_INS_ID_CD,ACQ_INS_NM from TBL_ACMGM_QRC_ACQ_INF order by ACQ_INS_ID_CD ) asv fetch first 2 rows only （取排序的前n条数据）

 

select count(*) from TBL_ACMGM_QRC_ACQ_INFwhere ACQ_INS_ID_CD in ('01029801','01029802') （字段范围）

 

select AREA_CD,proc_st,order_type,trans_tp,resp_cdfrom TBL_QRONL_TRANS_FLOW0601_0607 where ACQ_INS_ID_CD = '03010000' fetch first10 rows only;

 

selectproc_st,order_type,trans_tp,resp_cd,qr_code from TBL_QRONL_TRANS_FLOW0614_0618where order_type = '0210' fetch first 2 rows only

 

 

groupby

select resp_cd, count(*) fromtbl_qronl_trans_flow01 group by resp_cd having count(*) > '100'

 
分区间统计
select (case when trans_at >= 1 then '100' when trans_at < 1then '200' else '00000' end) as Gender,count(*) from tbl_qronl_trans_flow03group by (case when trans_at >= 1 then '100' when trans_at < 1 then '200'else '00000' end)