Recursive queries with external table anchor

Hi, I had the tables A and B. In table B, reviews are a tree structure. For each record in A, I want to get the respective records in B, in the following way:

SELECT
a.x, b.y
Of
one
CROSS JOIN
(
SELECT * FROM b
START WITH id = a.x
CONNECTION BY b.id = b.parentid PRIOR
) b

And I get the error indicating that the column a.x is not known. Is it possible to use columns of the external table as anchor points for a recursive queries? Or y at - it another way to form such a query?

Thank you.

Published by: David Hoksza on 13.11.2008 17:07

Hello

If all lines in b "inherits" the help of all its descendants.
In this case, do a subquery on b which associates each line with all its descendants (and itself).

WITH     bt     AS
(
     SELECT DISTINCT     aid
     ,          CONNECT_BY_ROOT id     AS root_id
     FROM          b
     CONNECT BY     parentid     = PRIOR id
)
SELECT     a.id          AS "a.id"
,     bt.root_id     AS "b.id"
FROM     a
JOIN     bt     ON     a.id     = bt.aid
;

Note that there is no START WITH clause. We want each row of b is considered to be the root of its own subtree.

Sorry, I don't have Express Edition to test this. It works in Oracle Enterprise Edition 10.
If CONNECT_BY_ROOT does not work (it was not available in Oracle 9), you can get the same information from SYS_CONNECT_BY_PATH.

Tags: Database

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The Oracle 12 c memory option works with external tables?

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This is not the right forum for this question; This forum is for the memory of TimesTen database not Oracle database in memory option. These are completely different things.

But it happens that I can tell you that no, external tables are not candidates for use with the In-Memory Option.

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problem of counting of returns to the clob line with external tables

Hello

I want to count the number of lines (x0A) in a clob loaded from an external table.
This is the data of the file

d               2010-06-21 13:25:23               2               1073807679               0               4               1               1               0               415               348                mtp       16387 ALIGN TIMER 2 EXPIRED iacSt=8 (Lnk 1)


xx               2010-06-21 13:25:23               2               1073807679               0               4               1               1               0               415               348                mtp       16387 Sent SIOS (Lnk 1) (AlignNP in InitialAlign)

That's how the loaded hex of the clob looks like:

64 09 09 09 32 30 31 30 2D 30 36 2D 32 31 20 31 33 3A 32 35 3A 32 33 09 09 09 32 09 09 09 31 30 37 33 38 30 37 36 37 39 09 09 09 30 09 09 09 34 09 09 09 31 09 09 09 31 09 09 09 30 09 09 09 34 31 35 09 09 09 33 34 38 09 09 09 20 6D 74 70 20 20 20 20 20 20 20 31 36 33 38 37 20 41 4C 49 47 4E 20 54 49 4D 45 52 20 32 20 45 58 50 49 52 45 44 20 69 61 63 53 74 3D 38 20 28 4C 6E 6B 20 31 29 0A 0A 0A 78 78 09 09 09 32 30 31 30 2D 30 36 2D 32 31 20 31 33 3A 32 35 3A 32 33 09 09 09 32 09 09 09 31 30 37 33 38 30 37 36 37 39 09 09 09 30 09 09 09 34 09 09 09 31 09 09 09 31 09 09 09 30 09 09 09 34 31 35 09 09 09 33 34 38 09 09 09 20 6D 74 70 20 20 20 20 20 20 20 31 36 33 38 37 20 53 65 6E 74 20 53 49 4F 53 20 28 4C 6E 6B 20 31 29 20 28 41 6C 69 67 6E 4E 50 20 69 6E 20 49 6E 69 74 69 61 6C 41 6C 69 67 6E 29 0A 0A 0A

You can see that there is a total of 6 '0 a' or 6 new lines. However, I get the following results:

select regexp_count(outputrow,'[[:cntrl:]]') control,regexp_count(outputrow,'[[:space:]]') space, regexp_count(outputrow,'[\n]') backslash_n, regexp_count(outputrow,'[\x0A]') x0A  
from BULK_BAD_FILE_EXTERNAL b;
   CONTROL      SPACE BACKSLASH_N        X0A
---------- ---------- ----------- ----------
        72        104           9         22

what I am doing wrong?

11g is not yet I'd

select length(outputrow) - length(replace(outputrow,chr(10))) num_of_rows
  from bulk_bad_file_external

Concerning

Etbin

recursive query with two tables

Hello

Im having problems of recursive query construction and add to select the list to see the result in hierarchical mode, so I want to your advice.

I have two tables:

TABLE: t1 
c_id       parent_id      c_level
1              -                 1
2              1                 2
3              1                 2
4              -                 1
5              4                 2
6              5                 3

TABLE: t2 
c_id         c_name
1               name1
2               name2
3               name3
4               name4
5               name5
6               name6

And I want to see the result like this:

-Name1
-name2
-Name3
-Name4
-Name5
-name6

Could you please help me with this?
Or maybe can you provide good links where I can find solution how to SELECT LIST looks like the hierarchical tree?

Here is my test scenario:

CREATE TABLE t1(
  c_id      NUMBER,
  parent_id NUMBER,
  c_level   NUMBER);

CREATE TABLE t2(
  c_id   NUMBER,
  c_name VARCHAR2(10));

INSERT INTO t1 VALUEs(1,NULL,1);
INSERT INTO t1 VALUEs(2,1,   2);
INSERT INTO t1 VALUEs(3,1,   2);
INSERT INTO t1 VALUEs(4,NULL,1);
INSERT INTO t1 VALUEs(5,4,   2);
INSERT INTO t1 VALUEs(6,5,   3);

INSERT INTO t2 VALUEs(1,'name1');
INSERT INTO t2 VALUEs(2,'name2');
INSERT INTO t2 VALUEs(3,'name3');
INSERT INTO t2 VALUEs(4,'name4');
INSERT INTO t2 VALUEs(5,'name5');
INSERT INTO t2 VALUEs(6,'name6');

SELECT LPAD('-',2 * a.c_level,'-') || b.c_name the_tree
  FROM t1 a,
       t2 b
 WHERE b.c_id = a.c_id
CONNECT BY a.parent_id = PRIOR a.c_id
 START WITH a.parent_id IS NULL;

and the result:

THE_TREE
----------
--name1
----name2
----name3
--name4
----name5
------name6

I took the example you gave then perhaps your largest data set has the flaw?

Published by: SunDogCa on August 13, 2010 14:19

Recursive information, how to create a recursive query with a table?
Hello

I have some data from a table and is stored in the following way:

Building blocks
4040 x 1, x 3, x 4
4040 c3, c7, c9
4040 j5, j7,
4040 s8
4041 f4
4041 x 1, x 2, x 3

I need to record in another table component and all of its units in one line, like this

Component Total_units
4040 x 1, x 3, x 4, c3, c7, c9j5, j7, s8
4041 f4, x 1, x 2, x 3

I tried with subqueries, combination, and I can't get in a data record.

I really appreciate your help!

Nicolas
The solution with xmlagg
Note: remove the end (en) this record 4040 j5, j7, manually
You can use the TRIM function to remove this as a GARNISH (end ',' units)
```
WITH dat as (select 4040 Component, 'x1,x3,x4'   Units from dual
union all    select 4040, 'c3,c7,c9' from dual
union all    select 4040, 'j5,j7' from dual
union all    select 4040, 's8' from dual
union all    select 4041, 'f4' from dual
union all    select 4041, 'x1,x2,x3' from dual
)
SELECT      Component
        ,TRIM (leading ',' from XMLAGG(XMLELEMENT(a,','||units).extract('//text()'))) col_name
 FROM      dat
GROUP BY component
/

 COMPONENT COL_NAME
---------- -------------------------------------
      4040 x1,x3,x4,c3,c7,c9,j5,j7,s8
      4041 f4,x1,x2,x3
```
SS

In the external table files forming themselves!

Hi all
I am facing a weird situation.
Few days back, DB has been improved to 11g 10g R2 and we are facing the situation of the training of logfiles, throw files have joined with external tables in the directory of the OS!
Without job is calling them and the only procedure in which these paintings have been used in the SELECT statement, are not running, even while these files form themselves and fill space in the BONE.
Here is the version information:
Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production
PL/SQL Release 11.2.0.3.0 - Production
"CORE 11.2.0.3.0 Production."
AMT for IBM/AIX RISC System/6000: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
Please help in this regard.
Thank you.

Hi all

Problem has been identified.

11 g, dbms_stats.gather_stats_job runs all day until 22:00 and after every 4 hours on weekends.

He also tried gathering statistics for external tables given through the GATHER_TABLE_STATS procedure.

In the process, he joint/written in the log files.

Now, I think of locking statistics from this table, so that no stats will be gathered for what is just an EXTERNAL table which is used/populated only once a month.

Suggestions or comments?

Thank you.

Number of the external table... probably simple

Hi guys,.

just mucking around with external tables for the first time after meeting a couple of discussions on the subject recently.

I'm in Oracle Database 11 g Enterprise Edition Release 11.2.0.2.0 - Production

in SYS, I did the following:

create or replace directory test_dir as '\home\oracle';
grant read, write on directory test_dir to hr;

now as HR, I do the following:

create table ext_test (id number, empname varchar2(100),rate number)
organisation external (type ORACLE_LOADER
                      default directory TEST_DIR
                      access parameters (records delimited by NEWLINE
                                      fields terminated by ','
                                      optionally enclosed by '"'
                                      missing field values are null
                                      reject rows with all null fields
                                     (id, empname, rate) ) 
location ('test_file.csv'));

and get the following:

SQL> @createexttab
organisation external (type ORACLE_LOADER
*
ERROR at line 2:
ORA-00922: missing or invalid option

What'm screwing?

Samir says:
Hi guys,.
What'm screwing?

spelling

EXTERNAL ORGANIZATION

Sqlloader Vs external Tables
HII All,
Currently, we use sqlloader. But now we are stuck to the top with a question. The problem is that in our production environment that they have installed customer sqlldr in the application server and the feed file in place in the Oracle server machine.

We tried everything to stay with sqlloader but nothing works very well. I tried with ftp to transfer the file from Oracle server to the client machine, but we use the secure port it did not work.

But this was easily accomplished using external table that the file is located in the server. But now I need to satisfy my clients by proving the external tables are relatively better.

I have google for Sqlloader vs. external this debate.

But I found no strong points supporting external tables.

I had also gone through the following links

http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:6611962171229

http://www.orafaq.com/Usenet/comp.databases.Oracle.misc/2007/02/13/0222.htm

So please help me by providing some plus points and other links.

Concerning
Rambeau
792353 wrote:
Yes, it's really a good point, but can be achieved once the data has been pumped into staging tables.

Who would take more space on the database, while the external tables you can do anything as the data is read. External tables would seem better in this regard.

And now, we are not concerned with all the functions for use in DEC.

People argue with me if we use external tables, we need create objects 2 db (1 external and more temporary table) which is just 1 intermediate table if sqlloader.

You only need the external table definition. If you create a temporary table with this depends on your needs and the need to have such a table "staged." Even if you did in SQL * Loader you would always create a staging table, if there is really no difference...

External table = 1 table definition and no data loaded in the database
SQL * Loader = 1 table and the data loaded into the database

Also read that when the feed file is huge its better to opt for sqlloader as it can circumvent sql analysis by choosing a DIRECT approach. Isisnt it?

External tables using SQL * Loader under the hood engine, so there is no real difference except where you want to keep your data (in the file, or load a copy first on the database). You can use the parallel with external tables to load using multiple threads, you can use the indicator append to load the data as in the direct approach of sql * loader.

So, kindly suggest me which is the best approach in a long-term process.

In the long term, the external tables are the best approach. They were introduced after SQL * Loader to provide an improved mechanism. If they were not better, Oracle would not have taken the trouble with them. They also have the advantage that the control of their use is on the database, i.e. no need to control files, no need to run a command-line utility, not two floors (loading then treatment) treatment.

There is no real reason for the use of SQL * Loader everything but more, the strange unique circumstance where you need to download data from a client computer (which will raise the question why a client machine has data on it in the first place!)

Can take us backup of external table using expdp
Can take us backup of the external table using expdp, please suggest any doc.

Thanks in advance.
Yes, this works, see this example:

http://www.Oracle.databasecorner.com/resource, 3950,data-movement-with-external-table-and-datapump.aspx

Werner

External table for the file delimmited by commas

Im trying to create a table of externla for the comma-delimited file
but it also has a scenario where the fields can have a comma between "" e.g.

example of record

1,one,first
2,two,second
3,three,third
4,four,"4,fourth"

Example of table

create table ext_table_csv (
  i   Number,
  n   Varchar2(20),
  m   Varchar2(20)
)
organization external (
  type              oracle_loader
  default directory ext_dir
  access parameters (
    records delimited  by newline
    fields  terminated by ','
    missing field values are null
  )
  location ('file.csv')
)
reject limit unlimited;

So when I question this record 4 table of Externla will be read as

M/2

i           n                      m
4         four     "4
{code}
Above Ext table is just an example, Im adding bad file and log file in real table.

Please help me if there is a way this can be resolved with external table.

Change the definition of:

FIELDS TERMINATED BY ', '.

TO:

FIELDS ENDED BY ',' POSSIBLY FRAMED BY "" "

With the help of external Tables
HELO - I have a few questions regarding the use of external tables, as I have not worked with them before.

From what I read, looks like they are more intended instead of SQL Loader, to simply load the data. But I was wondering if they are also used for queries. I ask because we usually create temporary tables to load the data provided by the company and we then attach this information to our main tables. The file that we just received is more 3 million lines, so I was wondering if it might be appropriate to use an external table and also, I can query this external table directly or will it still my temporary table as well.

In addition, it's the syntax that I found to create an external table and I was wondering if something escapes me.
```
SQL> create table xtern_empl_rpt
  2      ( empl_id varchar2(3),
  3        last_name varchar2(50),
  4        first_name varchar2(50),
  5        ssn varchar2(9),
  6       email_addr varchar2(100),
  7        years_of_service number(2,0)
  8      )
  9      organization external
 10      ( default directory xtern_data_dir
 11        access parameters
 12        ( records delimited by newline
 13          fields terminated by ','
 14        )
 15        location ('employee_report.csv')  
 16    );
```
I appreciate all the comments...

Thank you!
Christine
Hello

Based on what I read

It would be good to know what you have read sofar and where...

I can query this external table directly

Yes, once you have created.
An external table allows to process a file as if it were a table.
Don't forget that you can query only, you can not the update/delete/insert in an external table.

You can find many examples by searching on this forum,
or http://asktom.oracle.com
(for example: http://asktom.oracle.com/pls/asktom/f?p=100:11:0:::P11_QUESTION_ID:6611962171229))
or http://www.oracle-base.com/articles/9i/ExternalTables9i.php
or the Oracle Documentation @ http://tahiti.oracle.com

External table with mixed columns

Hello everyone. We use Oracle 11R1. We have an external table pointing to a CSV with 7 columns inside. The file has always column 7 but the column order differs from time to time. Each column has a header that remains consistent. Is there a way to map the column names to the column header, s so that we did not change the definition of the external table every time a new file is available in?
Thank you.

Hello

As John said, you must assign names of columns when the table is created. I guess you could have a dynamic SQL solution that reads the header you mentioned, uses this information to write a CREATE table, drop the table, and then recreated with the new order of the columns.

You may have a view that maps the 7 columns in your table of 7 columns in the view. Which column gets the mapping to that may depend on the header.

Loading external Table with quotes

I have a file with fields in the file are as TAB delimiter ~ TAB.
Example as below:
QM ~ CD ~ Exzm ~ BMW
DM ~ BD ~ Exzm ~ BMW
CREATE TABLE test
(
Col_1 VARCHAR2 (100),
Col_2 VARCHAR2 (100),
Col_3 VARCHAR2 (100),
Col_4 VARCHAR2 (100)
)
EXTERNAL ORGANIZATION
(TYPE ORACLE_LOADER
DEFAULT DIRECTORY 'Test_Report '.
ACCESS SETTINGS
(records delimited by '\n'
CHARACTERSET 'UTF8 '.
fields terminated by '\t~\t '.
missing field values are null
)
LOCATION ("test.asc")
)
REJECT LIMIT UNLIMITED;
OUTPUT:
----------------
Data loaded in DB, but col_4 data comes from the quotation as below
col_4
-------
"BMW".
"BMW".
Note: Col1 - col3 data arrives correctly.

2807064 wrote:

A finding on my side.

I found that the values of Col_4 after inserting into DB with "transport return character" (CHR (13)) at the end of each value as shown below when I copy paste the value in notepad ++ "»

Example:

----------

"BMW".

"

But if I see the file I saw that BMW.

My question is, in this case the external table loading must fail right? Why is this it is to load data in DB?

Do you have this file begin life on windows, and then are transferred to * nix to serve an external table? If so, which explains a lot. Windows is the standard record delimiter x '0d0a' (Chr (13) 10) On * nix, it's just x '0A' (10. When the process of loader is scanning for record delimiter he's just looking for the '0A' x and x'd 0' gets included in the data.

Two solutions-

1 - Make sure that the data file is transferred so that the Records delimiters are converted. It's supposed to to happen with ascii ftp mode, but this week I saw several examples in the House of it does not.

2. attach your table definition external to seek the delimiter of actual recording instead of the default value of the operating system. == RECORDS DELIMITED BY X '0D0A '.

External table with the preprocessor file to display the list of files

Hello
in my db 11.2.0.2 I would create an external table with script preprocessor to show me the list of files in a directory.
Preprocessor banally:
#! / bin/bash
CD/MyDir
/ bin/ls-l *.txt 2 >/dev/null
The problem is the file name that contains white space (style windows in a Linux env), for ex:
-rw - r - r - 1 oracle oinstall 920 9 Jun 17:37 File1.txt
-rw - r - r - 1 oracle oinstall 72316 Jun 10 10:37 file GC output1.txt
-rw - r - r - 1 oracle oinstall 72316 Jun 10 10:40 GC file output2.txt
So I can't use FIELDS DELIMITED BY "". ""
FIXED size? No, because the file size change the length of the lines.
I tried to use awk in my preprocessos script, but I have the same problem:

/ bin/ls-l *.txt 2 >/dev/null | / bin/awk ' {printf "%s %.2d %s %s\n", $6, $ 7, $ 8, $9} '.

Any ideas?

Hello

I used java to retrieve information about the files.

External table with the field tab delimiter

With the help of Oracle 11 g Release 2

Here is my table create statement external:

CREATE TABLE global.ext_a_attrib_cmt
(   tag      VARCHAR2(255)
  , from$    VARCHAR2(255)
  , to$      VARCHAR2(255)
)
   ORGANIZATION EXTERNAL
(  TYPE ORACLE_LOADER
   DEFAULT DIRECTORY EXT_DATA_DIR
      ACCESS PARAMETERS
        (  RECORDS DELIMITED BY NEWLINE 
           SKIP 1
           BADFILE EXT_BAD_DIR:'a_attrib_cmt.bad'
           LOGFILE EXT_LOG_DIR:'a_attrib_cmt.log'
       --    FIELDS TERMINATED BY 0X'09' -- TAB delimited  
           FIELDS TERMINATED BY '\t'
           OPTIONALLY ENCLOSED BY "'"
           MISSING FIELD VALUES ARE NULL
           REJECT ROWS WITH ALL NULL FIELDS
        )
      LOCATION ('a_attrib_cmt.txt')
)
   REJECT LIMIT UNLIMITED
   NOMONITORING
/

Here is the text file, a_attrib_cmt.txt:

tag	Of	TO
FrontSpringType_id	Coil	w/FRONT COIL SPRINGS
FrontSpringType_id	Sheet	the FRONT/w suspension SPRINGS
Aspiration_id	Naturally aspirated	w/o TURBO
Aspiration_id	Turbocharged	w/TURBO
Aspiration_id	Supercharged	w/COMPRESSOR
SteeringType_id	Grid	w/RACK and PINION STEERING
SteeringType_id	Gear	w/GEAR STEERING
FuelDeliveryType_id	CARB	w/o FUEL INJ
FuelDeliveryType_id	FI	w/FUEL INJ
BedLength_id		?" BED
BodyNumDoors_id		? DR
BrakeSystem_id		w / ? BRAKES
FrontBrakeType_id		w/FRONT? BRAKES

PUBLIC has privileges to write to the directory EXT_DATA_DIR.

Here is the error I get:

Globall@ORA1 > select count (*) in the ext_a_attrib_cmt;

Select count (*) in ext_a_attrib_cmt

ERROR on line 1:

ORA-29913: error in executing ODCIEXTTABLEOPEN legend

ORA-29400: data cartridge error

KUP-00554: error occurred when parsing the access settings

KUP-01005: syntax error: found 'minussign': expected an a: "badfile, bigEndian, characterset, column, data, delimited, discardfile,

disable_directory_link_check, fields, fixed, charge, logfile, language, nodiscardfile, nobadfile, nologfile, date_cache, preprocessor, TailleLue, String, jump,

territory, variable.

KUP-01007: line 5, column 8

Just get rid of the comment line. You cannot cave comments to create external table statement. SY.

Recursive queries with external table anchor

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