a query

Hi, forms 6i,

I have these tables

1 - items (item_id, item_eng_name).

2 - units (unit_code, unit_name).

I use this code in a trigger after query

select i.item_eng_name , u.unit_name
into :SOD.item_eng_name , :SOD.sale_unit_name
from items i , units u 
where item_id = :SOD.item_id 
and u.unit_code = :SOD.sale_unit_code ;

the result is correct, but I think that it should not be written like that, because

There is no join condition between two tables? I'm wrong or I can write this way?

Assuming item_id and unit_code are primary keys your code would do what you expect it to do: he will go get the item_eng_name and unit_name from 2 different tables. If item_id and unit_code is the primary key, you will get a record in each table. Join 2 tables together, you get a product of carthesian. Now, as said IF the 2 columns have the primary key, you would get 1 card for each table, and the carthesian product will return also 1 sheet.

If for some reason one of your tables does not contain the key you are looking for a no_data_found will be triggered:

$[CHE_TEST@glados_impl] create table items(item_id number, item_eng_name varchar2(20));

Table created.

$[CHE_TEST@glados_impl] create table units(unit_code number, unit_name varchar2(20));

Table created.

$[CHE_TEST@glados_impl] insert into items(item_id, item_eng_name) values (1, 'item1');

1 row created.

$[CHE_TEST@glados_impl] insert into units(unit_code, unit_name)values (1, 'unit1');

1 row created.

$[CHE_TEST@glados_impl] commit;

Commit complete.

$[CHE_TEST@glados_impl] declare
  2  vItemEngName items.item_eng_name%type;
  3  vUnitName units.unit_name%type;
  4  begin
  5  select item_eng_name, unit_name
  6  into vItemEngName, vUnitName
  7  from items i, units u
  8  where item_id = 1
  9  and unit_code = 1;
 10  end;
 11  /

PL/SQL procedure successfully completed.

$[CHE_TEST@glados_impl] ed
Wrote file c:\temp\afiedt.sql

  1  declare
  2  vItemEngName items.item_eng_name%type;
  3  vUnitName units.unit_name%type;
  4  begin
  5  select item_eng_name, unit_name
  6  into vItemEngName, vUnitName
  7  from items i, units u
  8  where item_id = 1 -- record exists
  9  and unit_code = 2; --record does not exist
 10* end;
$[CHE_TEST@glados_impl] r
  1  declare
  2  vItemEngName items.item_eng_name%type;
  3  vUnitName units.unit_name%type;
  4  begin
  5  select item_eng_name, unit_name
  6  into vItemEngName, vUnitName
  7  from items i, units u
  8  where item_id = 1 -- record exists
  9  and unit_code = 2; --record does not exist
 10* end;
declare
*
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at line 5

So you either find two keys or you find neither. If this is what you want, then your code is logically correct. However; This does not mean that you should do as it (always code as if the person who will maintain your code is a maniacal killer who knows where you live); It definitely takes time to get those head around to get why your code looks at the way in which it seems.

The equivalent logic which is (for me) is more logical at first sight is the following code:

$[CHE_TEST@glados_impl] r
  1  declare
  2    vItemEngName items.item_eng_name%type;
  3    vUnitName units.unit_name%type;
  4  begin
  5    select item_eng_name
  6    into vItemEngName
  7    from items i, units u
  8    where item_id = 1;
  9    --
 10    select unit_name
 11    into vUnitName
 12    from units
 13    where unit_code = 1;
 14  exception
 15    when no_data_found or too_many_rows then
 16      vItemEngName := null;
 17      -- when the first statement fails, vUnitName and vItemEngNAme will be null;
 18      -- when the second statement fails vUnitName will be null,
 19      -- we need to set vItemName to null
 20      raise; -- in your original code there is no exception handler
 21             -- so we'll reraise the exception here as well
 22             -- to get the very same behaviour
 23* end;

PL/SQL procedure successfully completed.

So, as I said: your original code is correct? If it is supposed to do the same as my code so it's okay. But this does not mean to do it like that because at least, in my opinion, my code is much clearer to understand on the first look.

see you soon

Tags: Oracle Development

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