| 释义 |
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Syscat.checks Contains a row for each table check constraint db2 select constname, tabname, text from syscat.checks. checks为每个表检查约束保持一个行db2 select constname, tabname, text from syscat . checks。 - 2
SYSCAT.COLCHECKS Contains a row for each column that is referenced by a table check constraint db2 select constname, tabname, colname, usage from syscat.colchecks COLCHECKS 为表检查约束所引用的每个列保持一个行 db2 select constname, tabname, colname, usage from syscat.colchecks - 3
When you want to determine whether a given row includes a comment, you no longer need to check for a null value in the COMMENT column. 确定某一个行是否包含注释时，不再需要检查 COMMENT 列的 null 值。
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