In Oracle DB, have a table called Details. The Details table data shown below.
Name | Age
--------------
xxx | 4
yyy | 1
zzz | 10
Required to swap ages from 4 to 1 & 1 to 4 without disturbing age 10. I used below query which yields error in Oracle sql developer.
update details set age= case when age=4 then 1
when age=1 then 4 end;
tried below query also:
update details set age= case when age=4 then 1
when age=1 then 4
else null end;
Error report for both queries:
SQL Error: ORA-01407: cannot update ("DETAILS"."AGE") to NULL
01407.
*Cause:
*Action:
You can restrict the update just for rows with age 1 or 4
update details
set age= case
when age=4 then 1
when age=1 then 4
end
where age in (1,4)
This will work as well but you will do unnecessary updates
update details
set age= case
when age=4 then 1
when age=1 then 4
else age
end
Related
Data:
ID PARENT_ID
1 [null]
2 1
3 1
4 2
Desired result:
ID CHILD_AT_ANY_LEVEL
1 2
1 3
1 4
2 4
I've tried SYS_CONNECT_BY_PATH, but I don't understand how to convert it result into "inline view" which I can use for JOIN with main table.
select connect_by_root(id) id, id child_at_any_level
from table
where level <> 1
connect by prior id = parent_id;
Is it possible to access the previous values that have not yet been stored in the database?
I have a table related to a particular module (MOD) which I will call table XA.
I can insert multiple records into XA simultaneously they are going to be inserted, I cannot change this fact.
For example, the following data is inserted in XA
ID | ParentId | Type | Name | Value
1 | 1 | 5 | Cost | 20000
2 | 1 | 9 | Risk | 10000
And I need in this case to insert / update a record in this same table. A calculated value
At the moment of executing the trigger, the value with the name of Cost for example is inserted first, and then the value of Risk.
When evaluating the Risk, I must have the ability to know what the Cost value is to make the calculation and insert the calculated record.
I tried to create a Package to which I would feed the data, but I still have the same problem.
create or replace PACKAGE GLOBAL
IS
PRAGMA SERIALLY_REUSABLE;
TYPE arr IS TABLE OF VARCHAR2 (32)
INDEX BY VARCHAR2 (50);
NUMB arr;
END GLOBAL;
//Using in trigger
GLOBAL.NUMB (:NEW.ID || '-' || :NEW.ParentId) := :NEW.Value;
BEGIN
IF :NEW.Type == 9 AND GLOBAL.NUMB (5 || '-' || :NEW.ParentId) IS NOT NULL
THEN
// calculate and insert record
ELSE IF :NEW.Type == 5 AND GLOBAL.NUMB (9 || '-' || :NEW.ParentId) IS NOT NULL
// calculate and insert record
END IF;
EXCEPTION
WHEN NO_DATA_FOUND
THEN
// NOT HAVE TWO INSERT TO SAME REGISTER
END;
Values 5 and 9 are for reference.
Both records are not always inserted, one or more can be inserted, even the calculated value can be imputed but must be replaced by the calculation.
And I can't create a view since there is an internal process that depends on this particular table.
Do you really really must store calculated value into a table? That's usually not the best idea as you have to maintain it in any possible case (inserts, updates, deletes).
Therefore, another suggestion: a view. Here's an example; my "calculation" is simple, I'm just subtracting cost - risk as I don't know what you really do. If calculation is very complex and should be run every time on a very large data set, yes - performance might suffer.
Anyway, here you go; see if it helps.
Sample data:
SQL> select * From xa order by parentid, name;
ID PARENTID TYPE NAME VALUE
---------- ---------- ---------- ---- ----------
1 1 5 Cost 20000
2 1 9 Risk 10000
5 4 5 Cost 4000
7 4 9 Risk 800
A view:
SQL> create or replace view v_xa as
2 select id,
3 parentid,
4 type,
5 name,
6 value
7 from xa
8 union all
9 select 0 id,
10 parentid,
11 99 type,
12 'Calc' name,
13 sum(case when type = 5 then value
14 when type = 9 then -value
15 end) value
16 from xa
17 group by parentid;
View created.
What does it contain?
SQL> select * from v_xa
2 order by parentid, type;
ID PARENTID TYPE NAME VALUE
---------- ---------- ---------- ---- ----------
1 1 5 Cost 20000
2 1 9 Risk 10000
0 1 99 Calc 10000
5 4 5 Cost 4000
7 4 9 Risk 800
0 4 99 Calc 3200
6 rows selected.
SQL>
I have a following table:
id name score
1 SYS 4
2 RHWTT 5
3 LEO 4
4 MOD3_ADMIN 5
5 VPD674 4
6 SCOTT 5
7 HR 4
8 OE 5
9 PM 4
10 IX 5
11 SH 4
12 BI 5
13 IXSNEAKY 4
14 DVF 5
I want to create a policy function in Oracle SQL that makes sure of the following things:
If a user(Leo) is executing a select statement on this table, it only gets 3 LEO 4.
sys_dba gets all the results no matter what.
I have given select permissions to Leo on this table created by Scott.
I am getting stuck at writing this complex PL/SQL function. I tried the following and it states compilation errors. Also, I think it does not do what I intend to do:
CREATE FUNCTION no_show_all (
p_schema IN NUMBER(5),
p_object IN VARCHAR2
)
RETURN
AS
BEGIN
RETURN 'select avg(score) from scott.rating';
END;
/
Based on your previous question and info you posted, here's how I understood the question: if you granted select on the whole table to any user, then it is able to fetch all rows from it. You have to further restrict values.
One option - as we're talking about the function - is to use case in where clause.
Here's an example.
Sample data:
SQL> create table rating as
2 select 1 id, 'sys' name, 4 score from dual union all
3 select 3, 'leo' , 3 from dual union all
4 select 6, 'scott' , 5 from dual union all
5 select 7, 'hr' , 2 from dual;
Table created.
Function:
it accepts username as a parameter (mind letter case! In my example, everything is lowercase. In your, perhaps you'll have to use upper function or something like that)
case says: if par_user is equal to sys, let it fetch all rows. Otherwise, fetch only rows whose name column's value is equal to par_user
return the result
So:
SQL> create or replace function f_rating (par_user in varchar2)
2 return number
3 is
4 retval number;
5 begin
6 select avg(score)
7 into retval
8 from rating
9 where name = case when par_user = 'sys' then name
10 else par_user
11 end;
12 return retval;
13 end;
14 /
Function created.
Let's try it:
SQL> select f_rating('sys') rating_sys,
2 f_rating('hr') rating_hr
3 from dual;
RATING_SYS RATING_HR
---------- ----------
3,5 2
SQL>
I suggest creating a view for each user, like so
create view THE_VIEW as select * from TABLE where NAME = user
Then grant access to the view only.
Now it doesn't matter what kind of query a user tries to perform on your table, she will only get one row back.
Of-course the DBA user can access all the table data.
I have Oracle 11g and a table called CODES and there is column ID and CODESA as follow:
ID CODESA
1 9999
1 8889
2 77777
2 99999
3 1234
3 4321
4 565656
etc.
Then I need to update another table CODES2 and column CODESB based on ID in CODES table
I need a trigger to monitor this.
Let´s say I monitoring ID = 2 with this trigger and all different CODESA´s under that ID,
you can see that only these are possible to update in CODESB
2 77777
2 99999
How to make a trigger to launch if user is trying to enter some code in CODESB
which is for example from ID = 3 ?
Appreciate your help. Thanks,
Some_user
#APC is correct. We can use foreign key but lets say OP dont want those columns to be primary or unique, in that case trigger is the solution.
Create or replace trigger codes2_trg
Before insert or update On codes2
For each row
Declare
Cnt number;
Begin
Select count(1) into cnt
From codes where (id, codesa) = (:new.id, :new.codesb);
If cnt = 0 then
Raise_application_error('-20001', 'these balues are not allowed.');
End if;
End;
/
Cheers!!
I have one table scores where I have saving users scores. It's looks like this
table `scores`
id | points | user_id
1 5 1
2 2 1
3 4 1
4 1 3
5 10 2
I want to select each user, sum his points and show as a ranking. The result from above should be
user_id | points
1 11
2 10
3 1
The query with which I came up is
$sumPoints = Scores::select( \DB::raw("sum(points) as numberOfPoints"), \DB::raw("count(id) as numberId"))->groupBy("user_id")->first();
The problem is in ->first() because it's return only one result.. it is working as must. If I try to use ->get() instead I've got Undefined property error. How should I use this?
The query which is working in phpmyadmin
SELECT count(id) as numberId, sum(points) as numberOfPoints FROM `points` GROUP BY `user_id`
You can use something like this
$sumPoints = Scores::select( \DB::raw("sum(points) as numberOfPoints"), \DB::raw("count(id) as numberId"))->groupBy("user_id")->get();
foreach($sumPoints as $point){
dd($point); //OR dd($point->numberOfPoints)
}