(SELECTFIRSTNMECONCAT' 'CONCATMIDINITCONCAT' 'CONCATLASTNAMEFROMEMPLOYEE XWHEREX.EMPNO = Y.MGRNO) AS MANAGER_NAMEFROMDEPARTMENT YWHEREMGRNOIS NOT NULL For each row returned for DEPTNO and DEPTNAME, the system finds where EMPNO = MGRNO and returns the manager's name. The result table produce...
根据上述的查询结果作为条件,查询顾客:select * from customers where cus_id = 'xxxx'; 最后将根据需求结果和实体的关联关系合并SQL: select * from customers where customers.cus_id in (select cus_id from orders where mer_id = 'x1'); 其实SQL中子查询有两种应用方式: 第一种也就上面的最常使用到的...
Store_Information表格 Geography表格 我们要运用subquery来找出所有在西部的店的营业额。我们可以用下面的 SQL 来达到我们的目的: SELECT SUM(Sales) FROM Store_Information WHERE Store_name IN (SELECT store_name FROM Geography WHERE region_name = 'West'); 结果: SUM(Sales) 2050 在这个例子中,我们并没有...
This is the complete query I am using below. Hbm_Matter will only 1 have unique record(matter_uno). How do I get multiple records returned in my query when there are 2 records in the subquery? select matter_uno, matter_name, bill_empl_uno from hbm_matter a where exists ( select top...
SELECT*FROMsales_agentsWHEREagency_fee>(SELECTAVG(agency_fee)FROMsales_agents); 如果子查询返回的结果不止1个,那么可以用ALL,ANY关键字,或者用IN,NOT IN,EXISTS,NOT EXISTS关键字进行筛选。例如: SELECTAVG(agency_fee)FROMsales_agentsWHEREidNOTIN(SELECTidFROMmanagers) ...
SELECT DISTINCT SALARY, FIRST_NAME, LAST_NAME FROM employees WHERE SALARY > (SELECT DISTINCT SALARY FROM employees WHERE LAST_NAME = 'Bull'); #2 Write a query to find the names (first_name, last_name) of all employees who works in the IT department ...
使用IN的子查询时,在子查询的返回结果中会自动去除NULL值的记录。 使用示例 示例1:使用格式1子查询语法。命令示例如下。 set odps.sql.allow.fullscan=true; select * from sale_detail where total_price in (select total_price from shop); 返回结果如下: +---+---+---+---+---+ | shop_name ...
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...
SQL-subquery's Een subquery is een SELECT-instructie die is genest in een SELECT, SELECT... IN INVOEGEN... DE INSTRUCTIE INTO, DELETE of UPDATE of in een andere subquery. Syntaxis U kunt drie syntaxisvormen gebruiken om een subquery te maken:...
子查询不包含 ORDER BY 子句。对一个 SELECT 语句只能用一个 ORDER BY 子句,并且如果指定了它就必须放在主 SELECT 语句的最后。 3.在子查询中可以使用两种比较条件:单行运算符(>, =, >=, <, <>, <=) 和多行运算符(IN, ANY, ALL)。 4