fix(pgsql): select from support view name

[Cythia828]

#255

• select from 语句中在文档详细说明里体现了table_name包含了table_name和view_name，补全支持view_name

文档链接：https://www.postgresql.org/docs/current/sql-select.html
文档截图：

[Cythia828]

@HaydenOrz @liuxy0551 @mumiao

[HaydenOrz]

#254

[HaydenOrz]

贴一下文档链接吧

[HaydenOrz]

+1

[mumiao]

+1