Oracle

How to find specific links between two tables

由 这一生的挚爱 提交于 2021-02-20 05:09:20
问题 I have lots of tables and lots of relationships between them. When I try to make some join between them I'm stuck at finding the relationship between the two tables. For the sake of simplicity let's say I have Table A and Table B . They are linked with a foreign key. Q: How can I find the foreign key between this two exact tables and the column it references? And not all the tables or foreign keys that have a reference to this table. 回答1: You can join the data dictionary constraint-related

How to find specific links between two tables

由 社会主义新天地 提交于 2021-02-20 05:06:56
问题 I have lots of tables and lots of relationships between them. When I try to make some join between them I'm stuck at finding the relationship between the two tables. For the sake of simplicity let's say I have Table A and Table B . They are linked with a foreign key. Q: How can I find the foreign key between this two exact tables and the column it references? And not all the tables or foreign keys that have a reference to this table. 回答1: You can join the data dictionary constraint-related

Merge data depending on object and no gaps in dates

由 我的未来我决定 提交于 2021-02-20 04:25:05
问题 I have got in the DB data like you can see below (additional info about dates: date in valid_from is included, date in valid_to is excluded) obj_number obj_related valid_from valid_to AA BB 01.01.2018 01.01.2019 AA BB 01.01.2019 31.03.2019 AA BB 31.03.2019 AA CC 01.01.2020 30.06.2020 AA CC 02.07.2020 31.10.2020 AA CC 31.10.2020 31.12.2020 AA DD 01.01.2018 30.11.2020 AA DD 30.11.2020 31.12.2020 I have to merge the data, but in a special way. It should be merged around obj_related to show the

PL/SQL procedure/function to show data from different tables dynamically alongwith the column names in first data row

由 ╄→尐↘猪︶ㄣ 提交于 2021-02-20 02:51:14
问题 I have a requirement like below. There are 70 tables and I have to build 70 queries from those 70 different tables depending on some condition. Let us say the table names are TAB_1,TAB_2,TAB_3.....,TAB_70 .The number of columns and data type of the columns are different in each table. I will get user input and I have to pass that value to an Oracle PL/SQL function or procedure GET_RESULT() and get the output in tabular format(same as we get when we run a query). Also, I have to show the

How to fetch data from oracle in batches from java in equal batches

由 谁说胖子不能爱 提交于 2021-02-20 01:48:29
问题 I have a table - emp_record which has 40,000 records And I want to fetch the records from java code and below is the requirement - At a time only 1000 records should be returned In the next hit next 1000 records continue till all the records exhaust The SQL query should not be nested, like select * from( SELECT a.*,rownum rn FROM distributor a) WHERE rn >= 3000 and rn < 4000; Any sort of help is much appreciated. 回答1: This sounds very artifical as 40.000 records is nothing. I would just read

How to fetch data from oracle in batches from java in equal batches

由 情到浓时终转凉″ 提交于 2021-02-20 01:44:49
问题 I have a table - emp_record which has 40,000 records And I want to fetch the records from java code and below is the requirement - At a time only 1000 records should be returned In the next hit next 1000 records continue till all the records exhaust The SQL query should not be nested, like select * from( SELECT a.*,rownum rn FROM distributor a) WHERE rn >= 3000 and rn < 4000; Any sort of help is much appreciated. 回答1: This sounds very artifical as 40.000 records is nothing. I would just read

低代码简史

由 限于喜欢 提交于 2021-02-19 19:44:20
近几天，一股“低代码”的风好像忽然又吹了起来，最让人关注的无外乎钉钉落子低代码，让低代码这个概念又回到了风口浪尖。您一定注意到了，前面的话中有两个“又”。 实际上，低代码的概念已经出现很久，但时而被大众提起，时而被冷落到边缘，起起伏伏好像成为了低代码的常态。 那么，低代码到底是什么？ 它从何而来？ 它到底是不是具备企业应用的价值？ 如果您长期关注Zoho，您一定对低代码开发平台会有一个初步的了解，因为 Zoho Creator低代码开发平台 已经植根这个领域10多年。 既然低代码的风又吹了起来，我们今天就再重新深入了解一次低代码，看看它是不是真的能乘风而起。 低代码的起源 20世纪末期，IBM在计算机硬件领域大杀四方的同时，始终没有将软件开发弃之不顾。1980年，IBM的快速应用程序开发工具（RAD）被冠以新的名称——低代码，由此，低代码的概念首次面向大众。 在近40年的历程中，低代码发展经历了两个阶段： 第一阶段 ：1980-2015年，低代码应用平台市场发展比较迟缓，表现亮眼的平台少之又少。但是，当今低代码领域的领导者产品，诸如Outsystem、Zoho Creator、Mendix等均诞生在这一时期，为以后的低代码发展打下了基础。 第二阶段 ：2015-2018年，低代码市场开始升温。2015年，AWS、Google

Insert TIMESTAMP with milliseconds in Oracle with cx_Oracle and Python 3.6

由 烂漫一生 提交于 2021-02-19 17:47:53
问题 I need to insert a timestamp with milliseconds in an Oracle table with Python 3.6 and cx_Oracle 6.4.1. The insert is done okay but I am losing the milliseconds on the way. The timestamp is passed as a datetime object. Any ideas how I could keep the milliseconds without making a to_timestamp() in the SQL itself? I would like to keep passing a datetime in the SQL transaction. I use executemany() as the idea is to insert multiple records at once. import cx_Oracle import datetime conf = {

Showing Trigger DBMS_OUTPUT.PUT_LINE in Oracle Apex

由 不打扰是莪最后的温柔 提交于 2021-02-19 08:57:05
问题 I have a trigger: CREATE OR REPLACE TRIGGER Med_Allergy_Warning BEFORE INSERT ON Prescription FOR EACH ROW BEGIN IF (Find_ADR(:NEW.Visit_ID, :NEW.Medication_ID) != 'GOOOO') THEN DBMS_OUTPUT.PUT_LINE('Medication ('||:NEW.Medication_ID||') May cause an allergic reaction… You are warned!'); ELSE DBMS_OUTPUT.PUT_LINE('Medication ('||:NEW.Medication_ID||') was prescribed successfully!'); END IF; END;/ That outputs a DBMS_OUTPUT.PUT_LINE whenever a user enters a prescription that may cause allergic

SQL turning rows into columns and populating with values

由 一世执手 提交于 2021-02-19 08:22:08
问题 I'm not quite sure why this table was designed this way, but it's making it hard to solve my problem. Looking at the data: NAME TYPE_NAME DEFAULT_VALUE VALUE TEST 1 Currency Null 14 TEST 1 Event Count 0 0 TEST 1 Usage 8 Null TEST 1 Events Amt 0 0 TEST 1 Usage Amt Null 13 TEST 1 From Date Null 5 TEST 1 To Date 6 Null TEST 1 Traffic Scenario Null 2 TEST 1 Band 1 Null TEST 1 Service 15 Null TEST 1 Tariff Rate Name Null 4 TEST 2 Currency EUR 0 TEST 2 Event Count Null 9 TEST 2 Usage 10 Null TEST 2
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