How does SQL Loader handle null values?

How does SQL Loader handle null values?

The SQL*Loader Control File

1. the action ( LOAD DATA)
2. the file containing the data (INFILE)
3. the table to load into.
4. The delimiter used in the file (FIELDS TERMINATED BY)
5. treat any missing values at the end of a line as null (TRAILING NULLCOLS)

What is trailing Nullcols in SQL Loader?

The TRAILING NULLCOLS clause tells SQL*Loader to treat any relatively positioned columns that are not present in the record as null columns. See Handling Short Records with Missing Data. The remainder of the control file contains the field list, which provides information about column formats in the table being loaded.

What is Nullif Oracle?

Description. The Oracle/PLSQL NULLIF function compares expr1 and expr2. If expr1 and expr2 are equal, the NULLIF function returns NULL. Otherwise, it returns expr1.

How do I skip blank lines in SQL Loader?

1 Answer

1. Pre-process the file and remove those lines with NULL fields before loading.
2. Load all records into your table then delete those with the NULL. second column.
3. Load all records into a staging table then select the rows you want. into the main table.
4. Use an external table and select the rows you want into the main.

What is filler in SQL Loader?

SQL LOADER lets to skip unwanted fields in the data file by using the “FILLER” clause. Filler was introduced in Oracle 8i. SQL LOADER also lets you load the same field into two different columns of the table. SQL LOADER again reads the first delimited field and skips it as directed by “FILLER” keyword.

What is integer external in SQL Loader?

The datatype specification of a field tells SQL*Loader how to interpret the data in the field. For example, a datatype of INTEGER specifies binary data, while INTEGER EXTERNAL specifies character data that represents a number. A CHAR field can contain any character data.

What is Nullif SQL Server?

Description. In SQL Server (Transact-SQL), the NULLIF function compares expression1 and expression2. If expression1 and expression2 are equal, the NULLIF function returns NULL. Otherwise, it returns the first expression which is expression1.

IS NULL THEN 0 in Oracle?

NVL. The NVL function allows you to replace null values with a default value. Using the NVL function we replace the null values with ‘ZERO’.

How do I skip middle records in SQL Loader?

3 Answers. You can skip the header rows using the SKIP clause but to skip the last records you will have to use the WHEN clause. Typically, your trailing records (last records) will not be identical to the other records in the file and there should be an indicator to specify that this is a trailer record.

What is database filler?

Note: If you use the Segment in a Database Block, fillers are ignored at generation time. This field identifies all the Data Elements that can be used as control break sort keys, or as access keys to a file, a database or a Pactables Table. …

How many characters can varchar2 hold?

4000 char
difference between varchar2(4000 byte) & varchar2(4000 char — oracle-tech.

What are the Isnull and Nullif functions?

Returns a null value if the two specified expressions are equal. NULLIF returns the first expression if the two expressions are not equal. Replaces NULL with the specified replacement value. …