Great advice as always. Tom, shouldn't the X'9' trick be said to work on single-byte charsets only? I suppose 9 is not the ascii code of TAB on a multi-byte charset. December 24, - am UTC. Hello Tom, I am facing a proble while loading tab delimited file with null values in columns.
I am describing the case as below. Kindly advise. How can I overcome this problem? Thanks and regards,. I have the same question as above. Kindly please answer the above quetsion for tab delimited data load. The script for loaidng tab delimited can be written as follows: It works good for me -- Loads data even though few fileds are null values. A reader, April 21, - pm UTC. I assume that NULLIF can be used in a scenario where you have control over modifying control file for individual columns but what if control file is dynamically generated and the column list dynamically generated by some other process is passed to control file as parameter.
In this scenario, how to handle the column that can be often null in data file? What option needs to be specified in control file that inserts a null into the that column rather than shifting remaining columns following that column and hence disrupting other column's data load?
Thanks in advance. April 21, - pm UTC. I guess the only answer would be to have the thing that dynamically generates the controlfile - you know - generate a proper and appropriate controlfile? If you give us an example to study, maybe we can suggest something but frankly, if the generated control file loads the data wrong - then - the generated control file is wrong - which means "go back to process generating controlfile" If you have delimited data - you do not need nullif if you have positional data - you do not need nullif nullif is used to conditionally set a field to NULL "IF" some condition is true.
It doesn't have anything to do with data that is null in the input file. Here it is below. Thanks, Rajesh. April 24, - pm UTC. Do you realize how "by magic and trickery" this all looks? And - it doesn't necessarily work, it doesn't ever have to work.
You assume that the rows are loaded one by one sequentially - they don't have to be - we might buffer up enough to warrant an array insert into T when BBB is true, then do a bunch of CCC, then It'll be non-maintainable and since it already doesn't work - you haven't lost anything please do a bit of code and process this input file - load up bind arrays and insert them in bulk.
You can certainly use plsql to do it. A reader, April 22, - am UTC. Let me try to explain the scenario I am converting a pre-existing process run against a different database to run against Oracle. The loading process needs to be changed to use Sqlloader utility instead and is called within a shell script. The shell script is doing other stuff alongwith loading. Primarily, the things of interest to sqlldr are The shell script 1.
In this scenario, where everything is generated at runtime, I have to generate the control file at runtime too by passing required parameters. So I developed a stored procedure that creates the control file and parameter file at runtime.
This procedure is called before sqlloader call and then newly created parameter file is used in sqlloader command. The required input parameters passed to procedure from shell are table name,list of columns, output location. Removing "optionally enclosed by '"' " in control file helps but as a undesirable side effect, it loads data with quotes " and that is not acceptable.
Changing the generation of data file might help, but that requires changing the existing process of generating files and dependencies , so working on lines of handling this in SQL loader instead for now.
Any help is appreciated. NULLIF aside it had nothing to do with anything - this is the way sqlldr works - if you use whitespace tab, space terminated by AND optionally enclosed by - then a series of tabs will be considered as one field.
Tom, I am not clear with this " please do a bit of code and process this input file - load up bind arrays and insert them in bulk " what does this load up bind arrays?
April 27, - pm UTC. A reader, April 26, - pm UTC. I am running this on a 10g database on linux OS. But i get the below error. So I ran the sql script by logging into sqlplus. Thanks, Ramya. Can you please help how to achieve the above requirment with a Sample Code? I do not believe you want to use sqlldr. When you select rows from an external table, the access driver performs any transformations necessary to make the data from the data source match the data type of the corresponding column in the external table.
Depending on the data and the types of transformations required, the transformation can encounter errors. The fields in the data file have the same name and are in the same order as the columns in the external table. A string, up to 4 bytes long. If the string is empty, then the value for the field is NULL. A string of numeric characters. If the string is empty, then the value for this field is NULL. When the access driver reads a record from the data file, it verifies that the length of the value of the KEY field in the data file is less than or equal to 4, and it attempts to convert the value of the VAL field in the data file to an Oracle number.
All access drivers have to handle conversion from the data type of fields in the source for the external table and the data type for the columns of the external tables.
The following are some examples of the types of conversions and checks that access drivers perform:. Convert character data from character set used by the source data to the character set used by the database. Verify that the length of data value for a character column does not exceed the length limits of that column.
When the access driver encounters an error doing the required conversion or verification, it can decide how to handle the error. It is as if that record were not in the data source. This is in keeping with the behavior of how Hive handles errors in Hadoop. Even after the access driver has converted the data from the data source to match the data type of the external table columns, the SQL statement that is accessing the external table could require additional data type conversions.
If any of these additional conversions encounter an error, then the entire statement fails. These conversions are the same as any that might normally be required when executing a SQL statement. If there is a non-numeric character in the value for VAL in the external table, then SQL raises a conversion error and rolls back any rows that were inserted.
To avoid conversion errors in SQL execution, try to make the data types of the columns in the external table match the data types expected by other tables or functions that will be using the values of those columns.
Data conversion occurs if the data type of a column in the SELECT expression does not match the data type of the column in the external table.
If SQL encounters an error converting the data type, then SQL aborts the statement and the data file will not be readable. To avoid problems with conversion errors that cause the operation to fail, the data type of the column in the external table should match the data type of the column in the source table or expression used to write to the external table.
This is not always possible because external tables do not support all data types. In these cases, the unsupported data types in the source table must be converted into a data type that the external table can support. Previous Next JavaScript must be enabled to correctly display this content.
See the following topics:. The real problem is that table C must contain records in either Excel or Access file format which is saved on a diskette. Thus apart from selecting records from table B to be inserted into table C, I should also find a way of reading or selecting matching records saved on the floppy diskette. Can this be achievable in oracle7. Can you give me a simple code to do that?
Table A studnumber,subject,level Table B studnumber,dept,year Table C studnumber,subject,level,dept,year. Thanks a lot. December 11, - pm UTC. Perfect maxu, December 11, - pm UTC. What about the dates? Tom your SP only work with int, but, how could it work with dates? March 14, - pm UTC. Thanks regards. November 30, - pm UTC. April 05, - pm UTC. Hi Tom, Suppose I have 2 tables - table1 and table2. Now I create a third table which has columns from table1 and few columns from table2.
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