在Oracle数据库中,使用SELECT语句和CASE表达式可以根据特定条件返回多个列。以下是一个示例,展示了如何使用CASE表达式在SELECT语句中返回多个列: 代码语言:sql 复制 SELECTCASEWHENcondition1THENcolumn1WHENcondition2THENcolumn2ELSEcolumn3ENDAScolumn_alias1,CASEWHEN
我在oracle子句中看到了许多关于SELECT INTO的解释。我发现了在Oracle和其他SQL数据库中应用SELECT INTO的不同之处。在Oracle中,SELECT INTO语句从一个或多个数据库表中检索值(如SQL SELECT语句所做的那样),并将它们存储在变量中(而SQL SELECT语句不这样做)。而在Postgres中,SELECT< 浏览0提问于2023-01-17...
ORACLE SELECT 语句中使用 CASE 前段时间做项目,需要从DB中读取数据,根据不同的类型,在画面显示不同的提示;以前为了简化SQL语句,统一做法都是写出SQL,然后在代码中判断处理,可是最近对象BUG发现,改别人的BUG时,遇见这种问题,代码就很难阅读,还需要大量的跟踪调试,才能明白业务逻辑。 所以这次项目,就要求了把这些业务...
oracle select case语句 oracle select case语句 Oracle数据库中的SELECT CASE语句是一种条件选择语句，根据一定的条件执行不同的操作。以下是十个使用Oracle SELECT CASE语句的示例：1. 根据员工的工资等级查询员工姓名：```sql SELECT employee_name,CASE WHEN salary > 5000 THEN '高级员工'WHEN salary > 3000 ...
SELECT sh.dc_code, g.bg_code, TO_CHAR (ship_date, 'MM') AS ship_date, SUM (CASE WHEN 2 >= NVL (p.pdt_packingweight, 0) THEN pl.picked_qty ELSE 0 END ) AS weight1, SUM (CASE WHEN NVL (p.pdt_packingweight, 0) > 2 ...
obclient> INSERT INTO t_case VALUES (1,'US'),(2,'UK'),(3,'CN'),(4,'JP'); Query OK, 4 rows affected Records: 4 Duplicates: 0 Warnings: 0 使用CASE表达式查询国家代码对应的全称。 obclient> SELECT id, abbr, CASE abbr WHEN 'US' THEN 'America' WHEN 'UK' THEN 'English' WHEN '...
I don't understand how YOU got THAT from his simple "select x=y". His statement is (to me) a simple query that returns (yes) a boolean result, but nothing else. In any case, I solved my problem, but am curious how "select x=y" could have possibly done it....
CASE WHEN pref_name in ('德岛', '香川', '爱媛', '高知') THEN '九州' WHEN pref_name in ('福冈', '佐贺', '长崎') THEN '四国' ELSE '其他' END AS district FROM poptbl 然后再加载SUM()聚合函数求解每一个分类地区的人数。原文提到先进行GROUP BY再进行SELECT的方式在一些诸如Oracle、DB2、...
1ORACLE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 end) 甘肃北部,sum(case when a.city_id in (34,33,32) then1 else 0 end) 甘肃东部,sum(case when a.city_id in (39,38,41) then1 else 0 end)...
CASE in select query Posted by:jim giner Date: April 04, 2012 02:31PM I vaguely remember using a case clause in a select statement in a former occupation, but now that I am using mysql (with php) I am encountering my first need for it and don't know if I can do what I want....