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 ...
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...
使用Oracle的SELECT语句时,如何利用CASE表达式处理并返回多列数据? 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_...
AI代码解释 SELECTorder_id,CASEWHENpayment_status='paid'THENCASEWHENshipping_status='shipped'THEN'Delivered'ELSE'Processing'--限定支付状态(payment_status )为支付完成,并且快递状态为“已发货”ENDELSE'Pending'ENDASorder_statusFROMorders; 6. 在 JOIN 条件中使用 CASE 根据特定条件进行多表关联。 代码语言:...
Oracle中Case语句中的Select语句 sql oracle oracle-sqldeveloper SELECT (CASE WHEN T.ID = ( SELECT cte.REFERENCE FROM trans cte WHERE T.ID = CTE.PARENT_ID) THEN cte.REFERENCE ELSE null END) AS name FROM trans T 示例:我选择一个事务值作为示例。在ID=1的trans表中,然后在同一个表中我需要...
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 ...
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....
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 '...
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、...
(select 1 as x, count(*) as cnt from PERSON w where person_status_id in (3, 4, 6) and w.UPDATED_ON > (sysdate - 30)) v inner join (select 1 as x, count(*) as cnt from PERSON w where person_status_id in (5, 7, 13) ...