The first section discusses nouns as a single predicate center.
第一节探讨单个名词充当谓语中心语的情况；
If you use double quotes around your string-based query predicate, instead of pairs of single quotes, you'll get a syntax error.
如果在基于字符串的查询谓词周围使用双引号，而不是单引号，就会收到语法错误。
DB2 can use an index defined on a single relational column to answer any equality or range predicate on this column.
DB 2可以使用定义在单个关系列上的索引来响应此列上的任何等式谓词或范围谓词。
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