SQL & PL/SQL :: How To Loop Through Nested Cursors Based On Value From 1st Cursor
Jul 21, 2011
I loop through the 1st cursor (account_csr), while in the 1st csr loop, based on some conditions being true, I want to loop through a 2nd cursor (acctper_csr) but I only want to retrieve data/rows in the 2nd cursor where the account_id column in 1st cursor = account_id column in the 2nd cursor. This will enable me to pull all the account_periods for each account I loop through in the first cursor.
I have attempted several different ways and cannot make this work. Thought I could somehow define a variable and store the account_id from 1st cursor and use on the 'where' clause in the 2nd cursor definition. Have not been able to make this work successfully.
Following is the sample of my
--First cursor (accounts)
CURSOR account_csr is
SELECT *
FROM s_dev_xref1.account A
WHERE a.source = 1
[Code]...
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Feb 19, 2010
We have a fact table t1 in the warehouse which has above 6 million records.There is to be an update like this where t2 has aid+bid as composite primary key. column aid repeats in t1.There's performance problem and we'v been told to break this huge update into pieces with few commits in the middle.
update t1
set t1.aid =
(select t2.aid from t2
where t1.bid = t2.bid
)
I've tried cursor loop with 3 commits in the middle based on if condition that evaluates on every iteration.
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Sep 5, 2013
collection1
============
SELECT o.object_id
BULK COLLECT INTO l_obj_info
FROM (SELECT n.node_id, n.object_id
FROM nodes n
START WITH n.node_id = 100
CONNECT BY PRIOR n.node_id = n.parent_node_id) n
INNER JOIN objects o ON n.object_id = o.object_id
WHERE o.object_type_id = 285;
collection2
============
SELECT *
BULK COLLECT INTO l_tab
FROM ((SELECT REGEXP_SUBSTR (i_l_text, '[^,]+', 1, LEVEL)
FROM DUAL
CONNECT BY REGEXP_SUBSTR (i_l_text, '[^,]+', 1, LEVEL) IS NOT NULL));
END;
collection3
============
SELECT o.object_id
BULK COLLECT INTO l_fin_tab
FROM objects o JOIN ATTRIBUTES att ON o.object_id = att.object_id
WHERE o.object_id = collection1.object_id
AND att.VALUE = collection2.val;
how to implement for loop in the collection3 to get the values from collection1 and collection2. i have tried in the below way
CREATE OR REPLACE TYPE LIST_OF_ATTRIBUTES_TYPE AS TABLE OF varchar2(4000);/
CREATE OR REPLACE TYPE LIST_OF_OBJECT_IDS_TYPE AS TABLE OF number(9);/
CREATE OR REPLACE FUNCTION f_get_objects_by_type_id ( i_object_type_id IN NUMBER, i_l_text IN VARCHAR2, i_scope_node_id NUMBER)
[Code]....
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Jul 29, 2013
I am using a record type to print some column in a same line.
Eg: I want to create index on some composite key columns. But i dont know how many columns are there. So want to use a loop which will count the number of column and then create the index like:
CREATE INDEX PRODUCT.XIF1AGMNT_PROD ON PRODUCT.AGMNT_PROD(LOAN_ID,LOAN_PROD_STRT_DT) TABLESPACE PRODUCT_INDEX;
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Oct 8, 2013
How to create this pl/sql process to add elements to a nested table or varray within a loop. Here's the scenario: I have an apex package that has some pl/sql processes and some stored procedures. I am dealing with Inspection Areas. An Inspection Area has several sectors. I already have the loop that lists all the Inspection Areas and a loop inside that loop that lists all the sectors. There is an if statement that determines whether or not the sector name gets stored in the varray or table. I am not sure how to correctly do this and am not sure whether to use a nested table or varray. I've posted somewhat of a pseudo coded example below
If (you_belong_in_table) then
variable := store_me_in_varray /* OR */
variable := array_type(sector.sector_name)
i := i + 1;
end if;
/* Now we output our varray or table */
start loop
output(sector names one by one)
end loop I hope this makes sense. I more so just need the syntax to be able to continually added values to a table or varray while I'm already inside a loop; and also how to output those values end the end as well.
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Mar 27, 2012
Following is the query on TPC-H schema.
explain plan for select
count(*)
from
orders,
lineitem
where
o_orderkey= l_orderkey.
The trace 10053 (as shown below) for this query shows nested loop join with Lineitem as outer table and Orders as inner table. It is effectively join on composite index (pk_lineitem) of Lineitem and unique index(Pk_orderkey) of Orders table. The cost calculation formula as given in the book as "outer table cost + cardinality of outer table * inner table cost " fails here. I am not able to understand this.
BASE STATISTICAL INFORMATION
***********************
Table Stats::
Table: LINEITEM Alias: LINEITEM
#Rows: 6001215 #Blks: 109048 AvgRowLen: 124.00
Column (#1): L_ORDERKEY(NUMBER)
AvgLen: 6.00 NDV: 1500000 Nulls: 0 Density: 6.6667e-07 Min: 1 Max: 6000000
[code]....
how the cost has been calculated. This does not follow the traditional nested loop cost formula as mentioned in the book.
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Jun 23, 2011
I'm joinging two tables event_types and tmp_acc tables.
event_types contains 2 Billion records
tmp_acc contains 20,000 records.
Resulting rows are about 300,000 records in event_types table end_t and account_obj_id0 are joined indexed
no indexs in tmp_acc.
When I run below query with nexted loop it takes 6 hrs to complete. But when I run with hash join even after 4 days it was still running. what is wrong with hash join here. Why it takes so long. I'm joining only 20000 rows. So I think there should be a way to get result rows quickly.
show parameters hash_area_size
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
hash_area_size integer 2097152
explain plan for
select --+ parallel(e,6)
[code]....
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Mar 1, 2012
DROP TABLE BatchEnrollment;
CREATE TABLE BatchEnrollment (
servicepointid VARCHAR(100),
curtailprogramid VARCHAR(100)
)
[Code]....
------------
Question I am getting error.
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Oct 18, 2012
I want to know how the Oracle optimizer choose joins and apply them while executing the query. So that I will insure about optimizer join before writing any query.
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Aug 19, 2010
I've create two types:
create or replace type VAL_REC as object
(WAARDE number(20,5) ) ;
create or replace type VAL_TAB is VARRAY(200) of VALREC ;
create or replace type WSN_REC as object
( START_DATE date
, END_DATE date
, DATA VAL_TAB) ;
create or replace type WSN_TAB as table of WSN_REC ;
In a PL/SQL table collecton WSN_TAB is filled. Now I want to create a query (ref cursor) that gives the result:
START_DATE END_DATE WAARDE(1) WAARDE(2) WAARDE(3) etc.
2010-08-15 2010-08-16 20 20 40
2010-08-16 2010-08-17 23 45 40
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Jul 31, 2012
I'm trying to fetch data from Ref Cursor OUT parameter filling by stored procedure. Using latest version of ODP.NET provider (11.2.0.3.0).
My stored procedure:
TYPE cursor_type IS REF CURSOR;
PROCEDURE test_proc (p_recordset out cursor_type) AS
BEGIN
OPEN p_recordset FOR
SELECT 1,2, CURSOR (SELECT 3,4 FROM dual)
FROM dual
END;
END test_proc;
If i'm removing "*CURSOR (SELECT 3,4 FROM dual)*" from the procedure, all works just fine. But when the nested cursor exists in procedure, i'm getting the following exception:
System.NullReferenceException occurred
Message=Object reference not set to an instance of an object.
Source=Oracle.DataAccess
StackTrace:
at Oracle.DataAccess.Client.OracleDataReader.GetOraDbTypeEx(Int32 i)
[code]........
My c# code:
using (OracleConnection conn = new OracleConnection(connString))
*{*
OracleCommand command = new OracleCommand();
command.Connection = conn;
command.CommandType = System.Data.CommandType.StoredProcedure;
command.CommandText = "test_proc";
[code].......
If i'm changing procedure signature from out parameter, to return value, code throws the same exception.
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Jul 30, 2012
When a cursor returns no records, how to handle this in Cursor for loop..
I had given sample code for handling this by using normal open,fetch statement, provide by applying for -Cursor For loop
DECLARE
P_BU_ID NUMBER;
P_SUMRY_DATA_TY_ID NUMBER;
P_OP_DATE VARCHAR2(32767);
P_PROC_DATE VARCHAR2(32767);
P_FIN_YEAR NUMBER;
[code]........
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Jun 15, 2012
I am an experienced SAS programmer jumping into PL/SQL for the first time and have already encountered a problem.Let's assume I have 7 records (shown below). (In reality, I have millions of records, but the concept's the same.) The Value field is only populated when it changes. Therefore, I am forced to "fill in the gaps" as I read the data file. It's fairly straightforward. I carry the value foward one record at a time, using it if the Value field in not populated. The ANSWER I want is also shown.
In reading through a PL/SQL book, I realized that only 2 chapters are relevant to what I do. My guess is this solution involves cursors; probably a Cursor FOR loop,
ID Year Amt ANSWER
1 2010 200 200
1 2011 ..... 200
1 2012 ..... 200
2 2009 300 300
2 2010 ..... 300
2 2011 450 450
2 2012 ..... 450
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Sep 10, 2013
In the below Table Structure, TB_Vehicles is the Master table and TB_Cars, TB_Bikes, TB_Cars are Satellite tables which hold more info about respective vehicles.
I want users to search using the Name. So, when users enter Name as 'Access', my query should give all information about that vehicle, including that from Satellite Tables (using both TB_Vehicles and TB_Scooters).
SELECT *
FROM TB_Vehicles
WHERE V_NAME = 'Access';
Similarly, if user enters 'Linea', it should give info from TB_Vehicles and TB_Cars tables.
So, with V_NAME as input, I'll find V_TYPE from TB_Vehicles table, and using that, I need to identify which satellite table, I need to join to retrieve more info.
Do I need to use CASE or DECODE to achieve this?
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Sep 11, 2012
I have a cursor returning some value.
for each value returned by the cursor i need to traverse through 31 rows(1 row per day * no of days in the month).
E.g. if cursor returns service_name as xyz then for xyz there can be 31 rows(service may not be used on some days)
I need to go to all of them and take some values and move them to a flat file. how should that be done?
Attached File(s)
Query.png ( 20.99K )
Number of downloads: 9
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Jul 9, 2013
BEGIN
FOR i IN 1 .. 10
LOOP
[Code]....
Assume the above is my code; there is inner and outer block.
Currently if inner block is failed, the outer block also going to exception block
But, my requirement is if inner block is failed it should not go to outer block, still the loop should continue and print 1...10 rows
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Jun 10, 2013
I am trying to retrieve info from multiple DBs and insert into a central DB via DB LINKS.The links are retrieved via a cursor.
However I keep coming up against 'PL/SQL: ORA-00942: table or view does not exist'...how to handle db_links using a cursor in a pl/sql block? The code is as follows:
DECLARE
db_link_rec VARCHAR2(30);
CURSOR db_link_cur IS
SELECT DB_LINK
from MESSAGING_PROD_LIST;
[code]....
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Nov 19, 2011
I am having a scenario where i have a ref cursor opening and fetching though dynamic sql query. And those values which i get from ref cursor i want to use them for other parameter cursor in for loop.
for example
PROCEDURE script (
p_account_no IN VARCHAR2,
p_from_date IN DATE,
p_to_date IN DATE,
p_subledger_code IN VARCHAR2,
p_posted IN VARCHAR2,
v_alloc_unalloc IN OUT alloc_unalloc, -- ref cursor declared in package specification.
[code]..........
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Apr 20, 2011
declare cursor c_abc (v_eno in varchar2,v_ename in varchar2) is
select empno,ename from emp
where empno=v_eno
and ename=v_ename;
v_eno emp.empno%type;
v_ename emp.ename%type;
begin
for re_ab in c_abc(1,'Dummy') loop
dbms_output.put_line( to_char(re_ab.v_eno)||' - '|| re_ab.v_ename);
end loop;
end;
/
I am getting error message ORA:06550
V_ENO must declared ..
Parameterized cursor for loop ..
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Jul 1, 2011
I wrote the following block :
set serveroutput on
declare
rec employees%rowtype;
cur SYS_REFCURSOR;
begin
open cur for 'select * from employees where rownum<:a' using 4;
for i in cur
[code]....
It gave errors if we execute is as such, but worked when I commented out the for loop and instead de-commented the simple loop. Does that mean that FOR cannot be used to loop through the records of a ref cursor ?
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Nov 19, 2010
I am not an Oracle programmer but I have been given a task to produce a number of Text files from an Oracle table based on a selection from the table itself.The table consists of many records with a currency code and I need to extract the data into named files based on the currency code.My first idea was to use Cursors and try a select statement matching on the returned value of the cursor but no Joy I can't make it work - perhaps I need to take a new approach.
Current / latest attempt below
DECLARE
CURSOR tmp_splitter_cur IS
SELECT DISTINCT end_consumer_country
FROM tmp_splitter
WHERE 1 = 1;
currency_rec tmp_splitter_cur%ROWTYPE;
[code]....
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Dec 15, 2011
I take a select into a cursor and process it record by record.I have to do sum based on a column and display row by row by using dbms_output.put_line .... So the sum has to happen based on a column. Based on the column value i need to display the cumulative sum as well.
Example:-
col1 col2 amount
DL AADD 25
DL BBCC 10
DL BBRR 15
Sum value for DL ----- 50
TX ADED 20
TX EDWW 60
Sum value for TX ----- 80
All the above data should be displayed using DBMS_OUTPUT.PUT_LINE in a pl/sql code. I use cursor to take the values from the table but the problem i face is .... I am not able to display the sum based in the col1 values.
Since i use the cursor .. i took the col1 values in to a variable and checked every time
old_variable = new_variable
if yes then continue the sum
else
display the sum value.
once i get the above check satisfied i am loosing a new col1 row in the check. The next loop only run for the new col1 values -1( which is used in the check loop).So is there any better way to get the solution or is there a facility to store the previous loop values in a cursor ? so that i dont have to loose that one row of data.
I am not able to come up with proper loop so which can identify that the col1 has changed and you have to display the sum value.
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Jul 25, 2011
I would like to exit from a cursor loop based on certain conditional checking. I am checking for a lot of different parameters and if they fail, I want to bypass it and fetch the next record in the cursor. I tried just putting an 'Exit' statement in the logic, but it fails. An example of my code is below:
For Row1 in cursor1
Loop
If amount < 0 then
balance := 0;
Else
[code]...
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May 13, 2010
I'm running a PL/SQL with a For Loop cursor, but when trying to execute it doesn't run. It is as if there is no data, but I ran the cursor separately in a SQL Plus session and it runs perfectly. I'm enclosing the file with the procedure.
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Dec 26, 2012
the problem we are facing is that we are having some problems with names in a filed which are not letters but strange symbols inserted by a webservice which by the way has been corrected, but we have the discrepancy on out DB, so I've decided to write a PL/SQL procedure to correct them.
Here is the example of an incorrect record.
4047254| STEVE; ROVINSON (THE INCORRECT SYMBOL IS CHR(32), I do not know why the forum doesn't show it)
So, if you look there's a symbol that is not interpreted by the DB and my original idea was to extract them and correct then with another procedure. I have originally wrote a procedure with the logic if there's a symbol that is not beween currect letters (from A to Z including semicolon (;)) extract them and that's it. So, the big question is, How I transfer the control from the second loop to the cursor loop in order to analice the next record.
here is the code which hasn't been completed yet.
DECLARE
CURSOR get_nombre IS
SELECT CNTA_NOM_ABRV
FROM CUENTA;
[code]...
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Mar 7, 2011
what is the difference between using a cursor and using a normal for/while loop to retrieve and process the result set.
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Aug 8, 2012
How can we pass column index or column name in cursor for loop.
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Feb 17, 2012
I have a table of 3 columns:
SQL> show user
USER is "ANDREY"
SQL>
SQL>
SQL>
SQL> --create the table:
[code]...
I insert rows into it:
SQL> --fill it with data:
SQL>
SQL> insert into a(key1 , key2) values (1 , 1);
1 row created.
SQL> insert into a(key1 , key2) values (1 , 5);
[code]...
i want to perform a logic by which:for every distinct value of key1 - values of key2 will be checked in all records holding that particular key1 value, and update the key3 field to 'inactive' where the key2 value for that particular key1 is the highest in number.
i've found out that i could do it by an SQL statement:
update a
set key3 = 'inactive'
where key2 = (
select max(key2)
from a a2 where a2.key1=a.key1
);
however I wanted to use the cursor to "load" the max key2 values FOR EACH distinct key1 value exists in the table,and do the same thing as the update statement above WITH A CURSOR,So tried and wrote the following:
SQL> create or replace procedure proc1
2 IS
3
4
5 var1 a.key1%type;
[code]...
unfortunately, it works only for one row, and i don't understand what's wrong, I executed, and checked what has changed:
SQL> exec proc1;
PL/SQL procedure successfully completed.
SQL> select * from a;
KEY1 KEY2 KEY3
---------- ---------- ----------
1 1 active
1 5 incative
2 24 active
2 21 active
ORA-01034: ORACLE not available
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May 10, 2011
Is there a way we could define a record or a nestedtable with a type based on weak refursor i.e
TYPE RC IS REF CURSOR;
C2 RC;
Type t is table of c2%rowtype;
Following is some more explanation of what I am trying to do.
I have a table T with column A and B. Column A is a primary key with number 1,2,3,4,5,6, Column B has diffrent sql stmts stored. i.e 'Select * from emp', Select count(1) from dept' and so on. So table will look like
1 Select * from emp
2 Select count(1) from dept
Now I want to select statements stored in table T one by one and execute them by using cursor. Problem arises as i need to fetch the cursor into some variable but the outcome of each statment is diffrent and oracle does not allow to use cursorname%rowtype for a weak ref cursor.
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Nov 1, 2011
Oracle Version: 11.2.0.2.0. I have two explicit cursors and I would like to choose at run time which one to run. Here is a simplified code snippet of what I am doing today:
DECLARE
CURSOR Cursor_A IS
SELECT * FROM EMP_A;
CURSOR Cursor_B IS
SELECT * FROM EMP_B;
RUNA CHAR(1) := 'Y';
[code]....
I want to avoid maintaining the same long list of transformations. I also want to avoid, if possible, an explicit FETCH INTO, because there are hundreds of fields in both tables. I'm looking for something like this (and I know this doesnt work):
DECLARE
CURSOR Cursor_A IS
SELECT * FROM EMP_A;
CURSOR Cursor_B IS
SELECT * FROM EMP_B;
RUNA CHAR(1) := 'Y';
CursorToRun IS REF CURSOR;
[code]....
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