The DBTG specification proposed a language for manipulating the files.
数据库任务组规范提出了一种操作文件的语言。
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When relational databases were first developed, this was the case; but, fortunately, a number of vendors agreed to develop a standard language for accessing and manipulating relational databases.
To support closures fully, a language needs to provide support for manipulating, invoking, and creating functions at run time and for functions to capture the environment in which they were created.