Populating Dimension Table

Question

Hi
I want to populate a dimension table.
here is the code i am trying to
THIS IS SV_DIM  DIMENSION TABLE
create table SV_DIM (
SV_KEY NUMBER(15),
SV_TYPE_CD VARCHAR2(50),
SV_TYPE_ROLLUP VARCHAR2(50),
SV_DIM_DESC VARCHAR2(100),
        PRIMARY KEY (SV_KEY)
I have created sequence using
CREATE SEQUENCE SVC_SEQ
INCREMENT BY 1
START WITH 1
NOMAXVALUE
NOMINVALUE
NOCYCLE
NOORDER;
CREATE TABLE  SV_TS (
    SV_GRP_CD VARCHAR2(2) NOT NULL,
    ALPHA_SVC_CD VARCHAR2(2) NOT NULL,
    SV_PKG_CD VARCHAR2(4) NOT NULL,
        PRIMARY KEY (ALPHA_SVC_CD)
Sample data for SV_TS table
SV_GRP_CD    ALPHA_SVC_CD     SV_PKG_CD
KO                           KO                       0101
KO                           KP                       0102
KO                           KB                       0103
GO                          GT                       0104
GO                          GW                       0105
GO                          GL                       0106
TO                          TN                       1901
TO                           TX                       0125
FT                           FS                       0301
FT                           FP                       0302
FT                           FO                       0111
I want to Populate my dimension table using this SV_TS table
My dimension Table will look like this
SV_KEY             SV_TYPE_CD        SV_TYPE_ROLLUP    SV_DIM_DESC
  1                       KO             NULL                            SVC
  2                       GO         NULL                             SVC
  3                       FT                NULL                            SVC
4                       TO             NULL                            SVC
I am writing the query like this
insert into SV_DIM
select
SVC_SEQ.NEXTVAL SV_KEY,
DISTINCT SV_GRP_CD SV_TYPE_CD,
NULL SV_TYPE_ROLLUP,
'SVC' SV_DIM_DESC
from
SV_TS
But I am getting error at distinct.
ERROR: ORA 00936:missing expression.ORACLE VERSION 10.2
Thanks
Sri
Edited by: SriSri on Jun 22, 2010 1:39 PM

Answer 1

SriSri wrote:
but my doubt is...
In which conditions we have to use this type of queries...?
I need some clear idea where and when we can use this type of queries..That's it.You can't use sequence in aggregation queries, ie those that group or aggregate the data;
select my_sequence.nextval, max(1)
from dual
ORA-02287: sequence number not allowed here
select distinct my_sequence.nextval
from dual
ORA-02287: sequence number not allowed hereIf the query has an aggregate function, ie MIN, MAX, SUM or a GROUP BY clause or the DISTINCT key word you cannot use NEXTVAL. There are other restrictions in the documentation.