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This image shows a row piece in a database block. The row piece is pictured as a horizontal slab. The left side of the slab is the row header and the right side is the column data. The row header contains the following: row overhead, number of columns, cluster key ID (if clustered), ROWID of chained row pieces (if any). The column data section contains the column length and column value. The row header contains the following: row overhead, number of columns, cluster key ID (if clustered), ROWID of chained row pieces (if any).
The large row piece at the top of the diagram corresponds to a small row piece in a database block, pictured as a vertical column. This column is identical to the column in the previous graphic.