在Python peewee中如何实现SELECT DISTINCT? 在使用Python peewee进行数据库操作时,可以通过使用Case函数在一列上选择不同的值。Case函数可以根据条件选择不同的值,并将其作为查询结果返回。 以下是使用Python peewee在一列上选择不同值的示例代码: 代码语言:txt 复制 from peewee import * #...
select( fn.Distinct(Pagevisits.visitor_id), PageLikes.liked_item) .join(PageLIkes) 这给了我一个错误:distinct() takes 1 positional argument but 2 were given 我可以并且已经在peewee中使用distinct的唯一方法是: javascript AI代码解释 query = (Page.select( Pagevisits.visitor_id, PageLikes.liked_it...
SELECT DISTINCT m.firstname || ' ' || m.surname AS member, f.name AS facility FROM members AS m INNER JOIN bookings AS b ON (m.memid = b.memid) INNER JOIN facilities AS f ON (b.facid = f.facid) WHERE f.name LIKE 'Tennis%' ORDER BY member, facility; fullname = Member....
users= User.select(User.username).distinct().count()print(users)# 10 聚合函数、执行原生的sql语句 -- 重要 (1)聚合查询 # 查询年龄最大值 fn.Max# max_age = User.select(fn.Max(User.age)).scalar()# print(max_age)# 查询年龄最大值的姓名# SELECT username FROM `new_user` where age = (...
Distinct(PageView.url))).scalar() 100 You can retrieve multiple scalar values by passing as_tuple=True: >>> Employee.select( ... fn.Min(Employee.salary), fn.Max(Employee.salary) ... ).scalar(as_tuple=True) (30000, 50000) SQL Functions, Subqueries and “Raw expressions”¶ ...
id.asc()) tests = Test.select().order_by(+Test.id) # 降序 tests = Test.select().order_by(Test.id.desc()) tests = Test.select().order_by(-Test.id) # 使用count()进行统计 n = Test.select().count() # 执行原生语句 name = "test" gender = "男" Test.raw('SELECT * FROM ...
包括子查询.分组查询.聚合函数查询.模糊查询,本文是介绍一下关系型数据库几种高级数据查询SQL语法,包括虚拟表.去重复查询.组合查询.连接查询. 去重复(DISTINCT) DISTINCT:用于返回唯一不同的值,主要是用于某一字段. 语法 SELECT DISTINCT <列名>|* FROM <表名> 示例 --查询所有班级名称 SELECT DISTINCT Class ...
Order by; Limit; Distinct; Group by; Having query = (Person.select(Person.name).order_by(Person.name).limit(10).distinct()) # 几乎和sql一模一样 Person.select().order_by(Person.birthday.desc()) # 日期排序 query = (Booking .select(Booking.facid, fn.SUM(Booking.slots)) ...
SELECT*FROMuserWHEREusernamenotlike"%admin%"# ~(User.username.contains('admin'))SELECT*FROMuserWHERELENGTH(username)>45# fn.length(User.username) > 45 参考:http://docs.peewee-orm.com/en/latest/peewee/query_operators.html 调用sql函数
调用sql函数 使用fn query = (User.select(User.username, fn.COUNT(Tweet.id).alias('ct')).join(Tweet, JOIN.LEFT_OUTER, on=(User.id == Tweet.user_id)).group_by(User.username).order_by(fn.COUNT(Tweet.id).desc())) 参考:https://peewee.readthedocs.io/en/latest/peewee/api.html#fn ...