今天遇到了一个Oracle的SQL问题:ORA-00918: column ambiguously defined 大致的意思就是字段名称不明确,可能存在同名的字段 SELECT * FROM (SELECT ROW_.*, ROWNUM ROWNUM_ FROM (SELECT ACCEPT_DEPT_NAME, ACCEPT_NO, ACCEPT_TIME, FINISH_TIME, RECENT_OPINION, ACCEPT_USER_NAME, APPLY_USER_ID, FIRST…

外层t.*的时候,可能发现重复字段,所以检查内层的sql是否出现了重复字段的查询.…

Topic Summary Topic: CORRECTIONS: Corrections Topic: DELIVER: Receiving Delivery Topic: DROPSHIP: Drop Shipment Topic: INSPECT: Receiving Inspection Topic: LOT_SERIAL: Lot/Serial Control Topic: ORACLE TIME AND LABOR: OTL Topic: PAY_ON_RCPT: Pay On Re…

1.创建测试表test1及test2 SQL)); 表已创建. SQL)); 表已创建. ,'name1'); ,'name2'); ,'name3'); ,'name4'); ,'name5'); SQL> select * from test1; ID NAME ---------- -------------------- name1 name2 name3 name4 name5 ,'China'); ,'Japan'); ,'USA'); SQL> SELECT * FROM TES…

ORA-00918: column ambiguously defined 异常原因: select 查询的字段在from的两张表中都存在,导致数据库无法区别需要查询的字段来自于哪张表 以下是例子 select distinct sales_branch_no, sales_code from (select sales_branch_no,sales_code FROM appl_state a,insur_appl b WHERE a.appl_id =b.appl_id AND b.new…

code as bellow *&---------------------------------------------------------------------* *& Include COLUMN_TREE_CONTROL_DEMOTOP * *& * *&---------------------------------------------------------------------* REPORT SAPCOLUMN_TREE_CONTROL_DE…

select * from DBA_CONS_COLUMNS ; ---Information about accessible columns in constraint definitions select * from DBA_LOG_GROUP_COLUMNS ; ---Information about columns in log group definitions select * from DBA_LOBS ; ---Description of LOBs contained i…

LAST UPDATE:     1 Dec 15, 2016 APPLIES TO:     1 2 3 4 Oracle Database - Enterprise Edition - Version 7.0.16.0 and later Oracle Database - Standard Edition - Version 7.0.16.0 and later Oracle Database - Personal Edition - Version 7.1.4.0 and later I…

我在上期讨论里已经成功的创建了一个简单的Slick项目,然后又尝试使用了一些最基本的功能.Slick是一个FRM(Functional Relational Mapper),是为fp编程提供的scala SQL Query集成环境,可以让编程人员在scala编程语言里用函数式编程模式来实现对数据库操作的编程.在这篇讨论里我想以函数式思考模式来加深了解Slick.我对fp编程模式印象最深的就是类型匹配:从参数类型和返回结果类型来了解函数功能.所以上面我所指的函数式思考方式主要是从Slick函数的类…

--检查数据库的等待事件 from v$session_waitwhere event not like 'SQL%' and event not like 'rdbms%' --找出系统中耗时的操作select b.username username,a.disk_reads reads,       a.executions exec,a.disk_reads/decode(a.executions,0,1,a.executions)           rds_exec_ratio,   …