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ABL Reference
Handle Attributes and Methods Reference : BEFORE-ROWID attribute

BEFORE-ROWID attribute

Returns the ROWID of the row in the before-image table that corresponds to the row in the after-image table currently associated with this buffer handle.
Data type: ROWID
Access: Read-only
Applies to: Buffer object handle
This attribute is set to the Unknown value (?) for row that have not changed.

See also

AFTER-ROWID attribute