这些命令怎么给我“缺少From子句”？
select name,count(path) as num from authors join articles on author.id=articles.author join log on log.path=concat('/article/', articles.slug) group by authors.name order by num desc;
select title, count(path) as num from articles join authors on articles.author = authors.id join log on log.path = concat('/article/',articles.slug) group by title, path, authors.name order by num desc limit 3;
这是我完整的python代码：
import psycopg2
db = psycopg2.connect(database="news")
c=db.cursor()
c.execute("""
select title, count(path) as num from articles join authors on articles.author = authors.id join log on log.path = concat('/article/',articles.slug) group by title, path, authors.name order by num desc limit 3;
""")
c.execute("""select name,count(path) as num from authors join articles on author.id=articles.author join log on log.path=concat('/article/', articles.slug) group by authors.name order by num desc;""")
rows=c.fetchall()
print (rows)
db.close
显示的错误如下：
psycopg2.errors.UndefinedTable：表“ authors”缺少FROM子句条目
第1行：...，作者的num（path）个数字加入author.id = ...上的文章
最佳答案
author.id应该更改为authors.id
关于python - 查询错误-缺少表的FROM子句条目-SQL，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/57282056/