The image cncpt059.gif shows the emp table with 2 columns: empno and mgr. The empno column has 3 rows: 210, 211, and 212. The mgr column has 2 rows: 210 and 211.
5000 is added to each employee number, and therefore each manager. In the first box, under the empno colunm, 210 is updated to 5210. In the second box, under the empno column, 211 is updated to 5211 and under the mgr column, 210 is updated to 5210. In the third box, under the empno column, 212 is updated to 5212 and under the mgr column, 211 is updated to 5211. Then, constraints are checked.
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