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
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.
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)
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;
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.
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.
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]....
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.
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.
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,
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.
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]....
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]..........
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 ..
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 ?
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]....
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.
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
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.
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;
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
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.
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;
