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PostgreSQL特殊关键字 

特殊关键字是指在SQL语言中有特殊用途的单词，比如ALL, ANY, ARRAY, AS, ASC, BETWEEN, BY, CASE, CAST, CREATE, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DEFAULT, EXISTS, FALSE, FOR, FROM, GROUP, HAVING, IN, INSERT, INTERSECT, INTO, IS, JOIN, LEADING, LIMIT, NOT, NULL, OFFSET, ON, OR, ORDER, SELECT, SESSION_USER, SOME, SYMMETRIC, TABLE, THEN, TO, TRAILING, TRUE, UNION, UNIQUE, USER, USING, VALUES, WHEN, WHERE, WINDOW, WITH

表字段名称如果出现这些特殊关键字，则需要通过单引号访问字段，如offset、group

select id , 'offset' , 'group'  from table_name