如果对目标表定义了冲突，冲突表与诊断表将保留没有满足约束的行。

If the target table has violations defined, the violation table and diagnostic table hold the non-conforming rows that fail to satisfy constraints.

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checks为每个表检查约束保持一个行db2 select constname, tabname, text from syscat . checks。

Syscat.checks Contains a row for each table check constraint db2 select constname, tabname, text from syscat.checks.

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第22行到28行为每周的每天定义了一个约束。

Lines 22 through 28 define one constraint for each day of the week.

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