I want to see the code of preexisting view in query window itself without going Schema Browser or directly going to that object. How to see view code in Oracle TOAD?
We can see using below script in SQL Server
sp_helptext 'viewname'
In Oracle I have tried like below
select * from USER_SOURCE where Name ='viewname'
but its not giving viewname code information. How to achieve this task in Oracle?
Example:
SQL> create or replace view v_emp
2 as
3 select d.deptno,
4 d.dname,
5 e.empno,
6 e.ename,
7 e.job,
8 e.sal
9 from emp e join dept d
10 on e.deptno = d.deptno
11 where d.deptno <> 30;
View created.
You were querying USER_SOURCE, but that view doesn't contain views - check USER_VIEWS instead. Query, similar to yours, doesn't return anything:
SQL> select text
2 from user_views
3 where view_name = 'v_emp';
no rows selected
Why no rows selected? Because Oracle stores object names in UPPERCASE by default unless you enclosed the name into double quotes, but - in Oracle - that's generally a bad idea as you'd always have to reference objects with double quotes, matching letter case. By default, you can reference them any way you want.
So:
SQL> select text
2 from user_views
3 where view_name = 'V_EMP'; --> note uppercase here
TEXT
----------------------------------------------------------------
select d.deptno,
d.dname,
e.empno,
e.ename,
e.job,
SQL>
But hey! Part of code is missing! That's SQL Plus, though. As view text is stored into a LONG datatype column:
SQL> desc user_views
Name Null? Type
----------------------------- -------- --------------------
VIEW_NAME NOT NULL VARCHAR2(30)
TEXT_LENGTH NUMBER
TEXT LONG --> here it is
TYPE_TEXT_LENGTH NUMBER
<snip>
you'd then
SQL> set long 10000
SQL> select text
2 from user_views
3 where view_name = 'V_EMP';
TEXT
----------------------------------------------------------------
select d.deptno,
d.dname,
e.empno,
e.ename,
e.job,
e.sal
from emp e join dept d
on e.deptno = d.deptno
where d.deptno <> 30
SQL>
and see the whole view code.
In TOAD, the result is a WIDEMEMO column so you'll have to double-click it to view the result (without using the SET LONG command; it is related to SQL*Plus only).
The view code will be present in user_views table in oracle. you can achieve this by using the query
SELECT * FROM user_views WHERE VIEW_NAME= UPPER('viewname')
Related
Is there a Oracle data dictionary table that associates a trigger with its trigger audit table?
enter image description here
You can check out DBA_DEPENDENCIES
SELECT *
FROM dba_dependencies
WHERE TYPE = 'TRIGGER' AND referenced_type = 'TABLE';
Query user_dependencies.
For example:
SQL> create or replace trigger trg_test
2 before insert on emp
3 for each row
4 begin
5 insert into dept (deptno) values (:new.deptno);
6 insert into owner (id_owner, name) values (:new.empno, :new.ename);
7 end;
8 /
Trigger created.
SQL> select referenced_name, referenced_type
2 from user_dependencies
3 where referenced_owner = user
4 and name = 'TRG_TEST';
REFERENCED_NAME REFERENCED_TYPE
-------------------- ------------------
DEPT TABLE --> trigger line #5
EMP TABLE --> trigger line #2
OWNER TABLE --> trigger line #6
SQL>
Bonus: there's that nice view called dictionary. If you query it, it reveals useful information and shows which tables (views) you could try to query to find information you need. In this very case:
SQL> select table_name, comments
2 from dictionary
3 where lower(comments) like '%dependenc%';
TABLE_NAME COMMENTS
------------------------------ ------------------------------------------------------------
ALL_DEPENDENCIES Dependencies to and from objects accessible to the user
ALL_XSC_SECURITY_CLASS_DEP All security class dependencies in the database
USER_DEPENDENCIES Dependencies to and from a users objects
SQL>
I have a Query where there is number datatype column. In case of empty resultset O/P is blank. I want 0 in that case.
My query is
select nvl(infodata,0)
from table1
where group_id = 111
and appid in (select max(id)
from table1, table2
where status = 'A');
Now my inner query is returning null in that case. NVL seems to be not working on infodata column. Please help
Outcome of such a query is no rows selected.
For example (based on Scott's EMP and DEPT tables as I don't have yours, and you didn't post test case), this query returns nothing:
SQL> select e.deptno
2 from emp e
3 where e.ename = 'Littlefoot';
no rows selected
If it is used as a subquery, the result is equal to what you currently have:
SQL> select nvl(d.dname, 'x') result
2 from dept d
3 where d.deptno in (select e.deptno
4 from emp e
5 where e.ename = 'Littlefoot'
6 );
no rows selected
But, if you apply aggregation (see line #1), then you'd get what you wanted:
SQL> select nvl(max(d.dname), 'x') result
2 from dept d
3 where d.deptno in (select e.deptno
4 from emp e
5 where e.ename = 'Littlefoot'
6 );
RESULT
--------------
x
As I said: it works on my test case; might, or might not on yours. If you post sample data, we'd have something to work with.
I have created a cursor that has two queries joined with inner join, but query is not compiling their is error at the end of first query but the same query is getting executed without cursor.
cursor data is
select * from
select rid,id, order from table1
inner join
select pid, name, order from table2
on table1.order = table2.order
original query is much bigger and complicated but end result would be this.
Their are compilation errors at the end of first query and those are generic nature, I guess may be syntax for creating a two joined queries is wrong (this is a wild guess though)
Error:
SQL statement ignored //at select word of first query
Missing right parenthesis //at the last word of first query
Example based on Scott's schema:
SELECT should contain column aliases if columns returned by those inline views share the same name; otherwise, you won't know which one you're using
inline views should have their own aliases; basically, that's always a good idea - prefix columns with table aliases, otherwise you'll soon forget which column belongs to which table
SQL> declare
2 cursor data is
3 select a.empno a_empno, b.ename b_ename
4 from (select empno, ename, deptno from emp) a
5 inner join
6 (select empno, ename, deptno from emp) b
7 on a.deptno = b.deptno
8 where rownum < 5;
9 begin
10 for data_r in data loop
11 dbms_output.put_line(data_r.b_ename);
12 end loop;
13 end;
14 /
SMITH
JONES
SCOTT
ADAMS
PL/SQL procedure successfully completed.
SQL>
You have to put your subqueries in parenthesis and add aliases for the subqueries:
cursor data is
select * from
(select rid,id, order from table1) table1
inner join
(select pid, name, order from table2) table2
on table1.order = table2.order
Here is another answer for you, with just small differences and with an example:
CREATE OR REPLACE PROCEDURE p_test(n_test in number)
AS
CURSOR data
IS
SELECT *
FROM
(SELECT rid
, id
, "order" or1
FROM table1) tab1
INNER JOIN
(SELECT pid
, name
, "order" or1
FROM table2 ) tab2
ON tab1.or1 = tab2.or1;
BEGIN
FOR data_i IN data LOOP
DBMS_OUTPUT.PUT_LINE(data_i.rid);
END LOOP;
END p_test;
Here is the DEMO
So i am trying to update my Vorschlagspakete table with some values i got from other tables. Precisely there are 3 values i want to write into the main table. Atm it looks like this:
update vorschlagspakete
set (paketid, verkaufsstelleid) = (
select k.paketid, k.verkaufsstelleid
from Konfiguration k, bewertung b
where k.konfigurationsid = b.konfigurationsid
group by k.paketid, k.verkaufsstelleid
having avg(b.sterne) >= 5);
But every time i tried this it results into ora-01427.
Error you got, ORA-01427, means too many rows (were returned by subquery). For example based on Scott's schema (as I don't have your tables), it looks like this:
SQL> update emp e set
2 (e.ename, e.job) = (select d.dname, d.loc from dept d);
(e.ename, e.job) = (select d.dname, d.loc from dept d)
*
ERROR at line 2:
ORA-01427: single-row subquery returns more than one row
Why wouldn't it work? Because subquery returns more than a single row!
SQL> select d.dname, d.loc from dept d;
DNAME LOC
-------------- -------------
ACCOUNTING NEW YORK
RESEARCH DALLAS
SALES CHICAGO
OPERATIONS BOSTON
SQL>
So, how would you put all those values into a single row of the EMP table? That won't work, obviously, so you have to do something to restrict number of rows. How? Well, it depends.
sometimes DISTINCT helps, e.g.
select distinct d.dname, d.loc from dept d
sometimes additional WHERE condition helps, e.g.
select d.dname, d.loc from dept d
where d.location = 'NEW YORK'
sometimes joining with the table to be updated helps, e.g.
select d.dname, d.loc from dept d where d.deptno = e.deptno
which leads to
SQL> update emp e set
2 (e.ename, e.job) = (select d.dname, d.loc from dept d where d.deptno = e.deptno);
14 rows updated.
What should you do? I don't know, we don't have your data. See whether something written above helps.
How to create a temporary table in oracle without knowing the number and name of columns.
For example:
Select columnA,columnB,* into temp_table from tableA.
Here,tableA maynot be a simple tablename but maybe derived from many queries.
How can this be achieved?Is there any alternative to this?
In Oracle, you have to first create a table, then insert into it. Or, create it directly (as in my example).
Note that I've created a "normal" table; if it were temporary, you could have chosen between a global or private (depending on database version you use).
For this discussion, I guess that it is just fine:
SQL> create table temp_table as
2 select a.*
3 from (select d.deptno, d.dname, e.ename --> this SELECT is your "tableA"
4 from emp e join dept d
5 on e.deptno = d.deptno
6 where job = 'CLERK'
7 ) a;
Table created.
SQL> select * from temp_table;
DEPTNO DNAME ENAME
---------- -------------------- ----------
10 ACCOUNTING MILLER
20 RESEARCH SMITH
20 RESEARCH ADAMS
30 SALES JAMES
SQL>
Alternatively, create a view and work with it:
SQL> create or replace view v_temp as
2 select d.deptno, d.dname, e.ename
3 from emp e join dept d
4 on e.deptno = d.deptno
5 where job = 'CLERK'
6 ;
View created.
SQL> select * from v_temp;
DEPTNO DNAME ENAME
---------- -------------------- ----------
10 ACCOUNTING MILLER
20 RESEARCH SMITH
20 RESEARCH ADAMS
30 SALES JAMES
SQL>
This statement creates temp_table which contains all columns and data from tableA and two other empty columns, varchar and numeric.
create table temp_table as
select cast (null as varchar2(10)) columnA,
cast (null as number(6)) columnB,
tableA.*
from tableA
If you need only structure, no data, then add:
where 1 = 0
I am not sure why you want to have a temp table as you do not know columns, but you can think of dynamic SQL to create table depending on columns required during your process and then drop it again. From my point of view I think it is not a good design.
I can suggest to think on using collection with 'x' number of columns with datatype as VARCHAR2. During transaction you can populate and process according to you need and it will also remain for that session.