Oracle 文档

https://www.oracle.com/cn/database/technologies/enterprise-edition/documentation/database.html

12c 选择右侧 book 菜单 找 sql reference

https://docs.oracle.com/cd/E11882_01/index.htm SQL Language Reference

https://docs.oracle.com/en/database/oracle/oracle-database/12.2/index.html

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