product,SUM(quantity)ASproduct_units,SUM(amount)ASproduct_salesFROMordersWHEREregionIN(SELECTregionFROMtop_regions)GROUPBYregion, product; with语句与全连接 WITHRECURSIVE included_parts(sub_part, part, quantity)AS(SELECTsub_part, part, quantityFROMpartsWHEREpart='our_product'UNIONALLSELECTp.sub_part, p...
用with as ,其实跟直接用子查询效率上没有什么区别;而用临时表与永久表相似,数据是真是存储到数据库里,相当于第二次直接关联的是一个小表,查询效率大大提高。 4使用场景 with as 适用于:为了增加代码可读性,且没有很多复杂的关联子查询。 临时表适用于:有很多复杂的关联子表查询。
并且WITH子句本身也可以被附加到一个主语句,主语句也可以是SELECT、INSERT、UPDATE或DELETE。 WITH regional_sales AS ( SELECT region, SUM(amount) AS total_sales FROM orders GROUP BY region ), top_regions AS ( SELECT region FROM regional_sales WHERE total_sales > (SELECT SUM(total_sales)/10 FROM...
SELECT t.* FROM test AS t ORDER BY id DESC LIMIT 10 offset 0; 报错信息 ### SQL: SELECT t.* FROM test AS t ORDER BY id DESC limit ? offset ? ### Cause: org.postgresql.util.PSQLException: ERROR: relation "test" does not exist liguanqiao创建了任务5年前 liguanqiao将关联仓库设置为...
Postgres`WITH ins AS…`将所有内容转换为文本 我在邮局有这张表 CREATE TABLE target ( a json b integer c text [] id integer CONSTRAINT id_fkey FOREIGN KEY (id) REFERENCES public.other_table(id) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION,...
f (2 rows) 多个code的场景 digoal=> with recursive sub as ( SELEC id,code,coalesce(case when length(substring(code,1,length(code)-3))=0 then null else substring(code,1,length(code)-3) end,'root') parcode, extend FRO tbl_role WHE code in ('001005','001003') union SELEC d.* FR...
对于LINQ的SQL查询,可以使用腾讯云提供的数据库产品 TencentDB for MySQL、TencentDB for SQL Server、TencentDB for PostgreSQL 等进行数据存储和查询操作。这些产品支持高性能、高可用、弹性扩展的特点,能够满足各类应用场景的需求。您可以了解更多详情,请参考腾讯云数据库产品官方文档:腾讯云数据库产品。相关...
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localhost:ytt>WITHrecursivetmp(a)AS->(SELECT->1->UNION->ALL->SELECT->a+2->FROM->tmp->WHEREa<100)->DELETEFROMy1WHEREidIN(TABLEtmp);QueryOK,50rowsaffected(0.02sec)localhost:ytt>table y1 limit10;+---+---+---+|id|r1|log_date|+---+---+---+|2|6|2019-05-16||4|8|2015-12...
这个时候就可以使用 PostgreSQL 的 WITH 子句了: WITH dep_with AS ( SELECT "id", "name", "parent_id" FROM department WHERE "id" = 10 ) SELECT dep."name" FROM department dep JOIN dep_with ON dep_with."parent_id" = dep."id" 这么一看好像使用 WITH 子句的代码量并没有比前两种写法少呀...