How to check the existence of a value in a table before copying the data?

Experts,

I have a requirement in which I need to copy data (4 columns) table A to table B (4 columns)

Table A (entry)

PART_ID PART_NAME PART_OPT_CD ENGG_OPT_CD

1 "AAA" 10 100
2 'BBB' 20 200
3 'CCC' 30 300
4 'DDD' 40 400
5 'EEE' 50 500


I have a table named OPTIONS with a single column. This is a table of reference of business which has the master list of option codes.

OPT_CD
10
20
30
50
60
100
200
400
500


I need to copy Table A to Table B, but in doing so, I need to check the values of columns 3 and 4 in the OPTIONS array.
If there is copy the folder B. Otherwise error in the log in a file/table and continue with the next copy

TABLE B (exit)

PART_ID PART_NAME PART_OPT_CD ENGG_OPT_CD

1 "AAA" 10 100
2 'BBB' 20 200
5 'EEE' 50 500

WARNING file or a table should have the details below.

300 ENGG_OPT_CD does not exist in the table OPTIONS, so part_id 3 have not migrated
40 PART_OPT_CD does not exist in the table OPTIONS, then part_id 4 have not migrated

Company don't bother about the format of error, we need this information to correct the OPT_CD in the OPTIONS table.

Can anyone suggest a better way to do this. Thank you for your help in advance

Hello

Its very similar to your previous post.
Re: PL/SQL help
The only difference being that you have to outer join to your superimposed master table, since your search in two columns values occur only in a single column on your Master table.

Something like that;

create table a (part_id number, part_name varchar2(10),part_opt_cd number,engg_opt_cd number);

insert into a
(select 1 Part_ID, 'AAA' Part_Name, 10 Part_Opt_CD, 100 ENGG_Opt_CD from dual union all
select 2, 'BBB', 20, 200 from dual union all
select 3, 'CCC', 30, 300 from dual union all
select 4, 'DDD', 40, 400 from dual union all
select 5, 'EEE', 50, 500 from dual union all
select 6, 'FFF', 60, 500 from dual
)
/

create table b (part_id number, part_name varchar2(10),part_opt_cd number,engg_opt_cd number);

insert into b
(select 1 Part_ID, 'AAA' Part_Name, 10 Part_Opt_CD, 100 ENGG_Opt_CD from dual union all
select 2, 'BBB', 20, 200 from dual union all
select 5, 'EEE', 50, 500 from dual
)
/

Create table master (OPT_CD number);

insert into master (
select 10 opt_cd from dual union all
select 20 from dual union all
select 30 from dual union all
select 50 from dual union all
select 60 from dual union all
select 100 from dual union all
select 200 from dual union all
select 400 from dual union all
select 500 from dual
)
/

create table log_msg
(msg varchar2(100)
,t timestamp default current_timestamp)
/ 

SQL> insert all
  2    when Master1_ID is not null and
  3         Master2_ID is not null then
  4      into b (Part_ID, Part_Name, Part_Opt_CD, ENGG_Opt_CD)
  5      values (Part_ID, Part_Name, Part_Opt_CD, ENGG_Opt_CD)
  6    when Master1_ID is null or
  7         Master2_ID is null then
  8      into log_msg (msg) values (Part_Opt_CD || ' ' || ENGG_Opt_CD || ' does not exist on the Master table')
  9  select m1.Opt_CD      as Master1_ID
 10        ,m2.Opt_CD      as master2_ID
 11        ,a.Part_ID      as Part_ID
 12        ,a.Part_Name    as Part_Name
 13        ,a.Part_Opt_CD  as Part_Opt_CD
 14        ,a.ENGG_Opt_CD  as ENGG_Opt_CD
 15  from (
 16        select a.Part_ID, a.Part_Name, a.Part_Opt_CD, a.ENGG_Opt_CD
 17        from a
 18        left outer join b on  a.Part_ID = b.Part_ID
 19        where b.Part_ID is null
 20      ) a
 21  left outer join master m1 on   a.Part_Opt_CD = m1.Opt_CD
 22  left outer join master m2 on   a.ENGG_Opt_CD = m2.Opt_CD
 23  /

3 rows created.

SQL> select * from log_msg;

MSG                                         T
------------------------------------------- -------------------------
40 400 does not exist on the Master table   05-OCT-11 09.44.17.621000
30 300 does not exist on the Master table   05-OCT-11 09.44.17.621000

SQL> select * from b;

   PART_ID PART_NAME  PART_OPT_CD ENGG_OPT_CD
---------- ---------- ----------- -----------
         1 AAA                 10         100
         2 BBB                 20         200
         5 EEE                 50         500
         6 FFF                 60         500

Note, I have included an additional line in table A in order to prove that the INSERTION will occur in table B. Errors, as you can see have been inserted in the table LOG_MSG.

Published by: bluefrog October 5, 2011 09:48

Tags: Database

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