with cr as 与最后面使用cr的语句之间不应该有其他语句,应该去掉‘’Select * from person.CountryRegion’后面使用的cr才有效。 2、CTE后面可以跟其他的CTE,但只能使用一个with,多个CTE之间用逗号(,)分隔,例如: with cte1 as (select * from table1 where name like 'abc%'), cte2 as (select * from ...
with cte as( select Id,Pid,DeptName,0 as lvl from Department where Id = 2 union all select d.Id,d.Pid,d.DeptName,lvl+1 from cte c inner join Department d on c.Id = d.Pid) select * from cte 表结构: Id Pid DeptName--- --- ---1 0 总部2 1 研发部3 1 测试部4 1 质量...
WITH为较大的查询提供了书写辅助语句的手段,辅助语句经常以公用表表达式(Common Table Expression, 缩写为CTE)形式被引用。WITH可将多条辅助语句附着在一条主语句上,辅助语句可以是SELECT, INSERT, UPDATE, DELETE,即增删改查,主语句也可以是增删改查。 示例1: WITH cte1 AS ( SELECT ... FROM xxx ... ),...
最近好喜欢用left函数来切时间呀 with cte as ( select uid,date(min(in_time)) as dt #求每天的新增客户 from tb_user_log group by uid ) select * from ( select dt,round(ifnull(count(distinct b.uid)/count(distinct a.uid),0),2) as uv_left_rate from cte a left join tb_user_log ...
SQL递归查询(with cte as) 递归结果集文章分类代码人生 withcteas(selectId,Pid,DeptName,0aslvlfromDepartmentwhereId=2 unionall selectd.Id,d.Pid,d.DeptName,lvl+1fromcte cinnerjoinDepartment donc.Id=d.Pid ) select*fromcte 表结构: Id Pid DeptName--- --- --- 10总部21研发部31测试部41质量...
SqlServer共用表达式(CTE)With As 处理递归查询 共用表表达式(CTE)可以看成是一个临时的结果集,可以再SELECT,INSERT,UPDATE,DELETE,MARGE语句中多次引用。 一好处:使用共用表表达式可以让语句更加清晰简练。 1.可以定义递归公用表表达式(CTE) 2.当不需要将结果集作为视图被多个地方引用时,CTE可以使其更加简洁 ...
简介: with cte as(select Id,Pid,DeptName,0 as lvl from Departmentwhere Id = 2union allselect d.with cte as ( select Id,Pid,DeptName, 0 as lvl from Department where Id = 2 union all select d.Id,d.Pid,d.DeptName,lvl + 1 from cte c inner join Department d on c.Id = d.Pid...
with cte as(select distinct job_id, boss_id, company_id, job_city from job_info where post_time > '2021-01-01' union select job_id, boss_id, company_id, job_city from job_info where job_city ='上海' ) select job_id, boss_id, company_id from cte order by job_city点...
WITH recursive cte AS ( SELECT id, parent_id, name FROM categories WHERE parent_id IS NULL UNION ALL SELECT c.id, c.parent_id, c.name FROM categories c INNER JOIN cte ON c.parent_id = cte.id ) SELECT * FROM cte;在上面的示例中,我们使用 WITH RECURSIVE 关键字定义了一个名为 cte ...
将With CTE与CREATE/INSERT顺序一起使用是指在SQL语句中使用公共表表达式(Common Table Expression,CTE)与CREATE或INSERT语句结合使用。 公共...