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ABAP Keyword Documentation → ABAP Glossary →Initial value
The runtime environment defines an initial value for each data type. The initial values of the elementary data types depend on the corresponding predefined ABAP type. The initial value of reference types is the null reference. The initial value of an internal table is an empty table without rows. The initial value of structured types is produced from the initial values of the individual components. The statement CLEAR with no additions sets a data object to the appropriate initial value for its type.