是指在Oracle数据库中,使用SELECT语句查询数据时,可以将一个SELECT语句作为子查询嵌套在另一个SELECT语句的CASE语句中。 具体来说,CASE语句是一种条件表达式,用于根据条件返回不同的结果。而子查询是指在一个查询中嵌套另一个查询,内部查询的结果作为外部查询的一部分。 在使用Oracle数据库时,可以将SELECT语句作为子...
使用decode的方式: selectname, decode(-1,sign(money-50),'贫农',sign(money-80),'中农','富农')fromt2 注:sign函数返回一个数数值的正负标识, 语法如下:sign( number ) number 要测试标志的数字. If number < 0, then sign returns -1. If number = 0, then sign returns 0. If number > 0, ...
SELECT X=Y ?? Is that a Select statement with one result? Not what I want. Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily...
b中 当a.city_id in (34, 33, 32) 时,是返回的2 你这又是个sum()函数.当然结果不一样了. 分析总结。 这两种写法查询结果不一样请问区别在哪里结果一 题目 ORACLE中的CASE……WHEN这两种写法查询结果不一样,请问区别在哪里?A:select sum(case when a.city_id in (47,45,35,37,36) then1 else 0...
The coalesce statement is a bit like the Oracle NVL function. Given an unlimited number of arguments, it will return the first non-null value in those arguments. Here is an example: SELECT ename, COALESCE(comm, 0) COMM FROM emp;
我正在尝试使用R中的RODBC在Oracle SQL数据库上执行一个简单的"if/then“语句。SQL语句在SQL Developer v4.0.2.15中运行良好,但在R中执行相同的语句时抛出错误 sqlQuery(channel, " select Variable1, Variable2, CASE WHEN Variable1 = 0 then 0 else 1 end as Var3 from schema.TABLE where ROWNUM<100;...
How to use CASE in the WHERE clause If you want to find all the exam results with A or B grades, you can place theselectabove in a subquery. Then filter it in the outer query. Or you can slap thecaseexpression directly in thewhereclause, like so: ...
advanced')query="SELECT std_id,club_id,main_club_flg FROM StudentClub"df=pd.read_sql(query,...
2024年oraclesql case when 摘要:select a.pact_no,(图片来源网络,侵删)a.cif_no,a.cif_name,case when a.pay_type='1' then '自主支付' whe... select a.pact_no, (图片来源网络,侵删) a.cif_no, a.cif_name, case when a.pay_type='1' then '自主支付' when a.pay_type='2' then '...
ActivityRunsQueryResponse ActivityState AddDataFlowToDebugSessionResponse AmazonMwsLinkedService AmazonMwsObjectDataset AmazonMwsSource AmazonRdsForOracleLinkedService AmazonRdsForOraclePartitionSettings AmazonRdsForOracleSource AmazonRdsForOracleTableDataset AmazonRdsForSqlAuthenticationType AmazonRdsForSqlServerLinkedServic...