selectAREA_IDfrom x where x.AREA_ID<>o.f_area_id)group byAREA_NAME; 在FILTER中,NOT IN(NOT EXISTS)后的SQL语句多次执行,本来数据量就很大,每次都要执行一遍,结果可想而知。但是使用HINT MATERIALIZE和WITH AS 结合使用,把表中部分列实体化,执行过程中会创建基于视图的临时表。这样就不会每次NOT EXISTS...
InvalidOperationException: Error generated for warning 'Microsoft.EntityFrameworkCore.Query.QueryClientEvaluationWarning: The LINQ expression 'GroupBy(1, [y])' could not be translated and will be evaluated locally.'. This exception can be suppressed or logged by passing event ID 'RelationalEventId.Qu...
由于我正在进行分页，我发现我必须使用subQuery和group，它是我正在查询的主模型的主键。虽然这解决了我没...
res=@0x7fc70415ed14: 0, optimize_after_sdb=@0x7fc70415ed0c: 1, sdb_free_join=@0x7fc70415ed10: 1, with_insert=0) at /data/jenkins/workspace/stonedb5.7-zsl-centos7.9/storage/stonedb/handler/ha_rcengine.cpp:82 #7 0x000000000246fe9a in execute_sqlcom_select (thd=0x7fc2f8000b70, ...
mysql sum必须group by mysql subquery 子查询(Subquery): 指出现在其他SQL语句内的SELECT子句。 子查询嵌套在查询内部,且必须始终出现在原括号内 子查询可以包含多个关键字或条件(如DISTINCT,GROUP BY,OREDR BY,LIMIT,函数等) 子查询外层查询可以是SELECT,INSERT,UPDATE,SET或DO...
Subquery Factoring, 其实就是平常比较熟悉的With语句,Adrian Billington 在他的网站上写了一篇介绍Subquery Factoring很好的文章,见这里。这篇Blog同样是对他的这篇文章的笔记。 With语句一般有两种用途,一种就是用来把复杂的SQL语句简单化:复杂的SQL语句一般都会嵌套很多层次,无论是写起来还是读起来都很困难,通过用Wit...
WHERE t1.c1 in (select c2 from t1); <= subq2 其投影列中,和where条件中,各有一个子查询,这些在MySQL中都使用Item来描述,具体来说是Item_subselect 背景 首先对于子查询这个SQL construct,有相关和非相关两个类别,SQL planner在完成语法解析和语义检查后,就可以确定一个子查询是否是相关的(和外层的某些表...
sql sql-server tsql logic 我正在尝试运行以下查询,但遇到此错误: 无法对包含聚合或子查询的表达式执行聚合函数。 SELECT IVCSUM1.ivcnum "Invoice Number" ,IVCSUM1.ivcgrsamt_amt "Gross Amount" ,IVCSUM1.ivcgrsamt_cur "Gross Amount Currency" ,SUM(ISNULL(IVCLINE1.ivclinextamt_amt, 0) + ISNULL...
ANY and ALL subqueries are used with relational comparison operators: =, >,>=, <, <=, and <>. In SQL, the set operator IN is used as a shorthand for =ANY and the set operator NOT IN is used as a shorthand for <>ALL.
WITH +flights AS ( SELECT FROM sflight FIELDS carrid, connid, AVG( seatsocc AS DEC( 16,2 ) ) AS avg WHERE carrid IN @carrids GROUP BY carrid, connid ORDER BY carrid, connid UP TO 1 ROWS ) ##db_feature_mode[limit_in_subselect_or_cte] ...