null value co to jest
ABAP definicja null value. Co znaczy column in a row of a database table. Null values can be.
Znaczenie null value definicja.

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Definicja null value

Co znaczy NULL VALUE:

Initial value of an empty column in a row of a database table. Null values can be processed using Native SQL statements, but they have no equivalent as the content of data objects in ABAP. Only the WHERE condition enables a special condition IS NULL for null values. Changing Open SQL statements (INSERT, UPDATE, MODIFY) generally do not create null values, provided you are not processing a view that does not comprise all columns of a database table. However, depending on the database system, you can also display empty strings as null values. Null values can still arise in database tables if new columns are appended to filled tables. When reading with the Open SQL statement SELECT, null values can be created by aggregate functions or an outer join, but they are converted to initial values of the correct type when passed to data objects.

SAP przykład użycia NULL-VALUE pomoc. Jak działa null-value kod programu ABAP. Wykorzystanie kodu Null-Value w programie funtion module SE37. Obsługa funkcji null-value w klasie.

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