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文章 2022-02-16 来自：开发者社区

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文章 2022-02-16 来自：开发者社区

本文档为PostgreSQL 9.6.0文档，本转载已得到原译者彭煜玮授权。 SQL输入由一个命令序列组成。一个命令由一个记号的序列构成，并由一个分号（";"）终结。输入流的末端也会标志一个命令的结束。具体哪些记号是合法的与具体命令的语法有关。一个记号可以是一个关键词、一个标识符、一个带引号的标识符、一个literal（或常量）或者一个特殊字符符号。记号通常以空白（空格、制表符、新行）来分隔，....

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