How to use foreign key constraint on non primary key? For example I have two tablesaccountandtransactions. I want to check theacnamein tabletransactionsis one of theacnamein tableaccount. tableaccount (acno, acname, bal, type)tabletransactions (tid, acno, acname, bal, credit/debit,...
CREATE TABLE A(a VARCHAR(10), b VARCHAR(10), d DATE , UNIQUE(a,b)); INSERT INTO A(a, b, d) VALUES (NULL, NULL, NOW()),('a', NULL, NOW()),(NULL, 'b', NOW()),('c', 'b', NOW()); CREATE TABLE B(id INT PRIMARY KEY, ref_a VARCHAR(10), ref_b VARCHAR(10)); ...
But please may I know how am I supposed to know when table’s primary key / foreign key do not match and doesn’t show any relationship in ERD as below. But when I extracted the ERD diagram of CT_Loc and CT_ Hospital they do not have any relationship and when I used the...
Having an entity-relationship (ER) diagram of the I_S views makes it a lot easier to determine how one might "extend" them. In this diagram, I've drawn implicit relationships from all the constraint tables back to TABLE_CONSTRAINTS. (TABLE_CONSTRAINTS, KEY_COLUMN_USAGE, and CONSTRAINT_COLUM...
Having an entity-relationship (ER) diagram of the I_S views makes it a lot easier to determine how one might "extend" them. In this diagram, I've drawn implicit relationships from all the constraint tables back to TABLE_CONSTRAINTS. (TABLE_CONSTRAINTS, KEY_COLUMN_USAGE, and CONSTRAINT_COLUM...
Other market data may be associated with a key corresponding to an order. For example, a Spot rate and end dates may be stored against an MI records for the Forward FX market types. Orders are stored, for example, in a single-format order record, which are registered by the workstation...
Since innovations can be very recent, thereby impeding the assessment of their real impact on sustainable development, we have decided to include, as a key assessment factor, the intention of the company when developing a product or service, which contributes towards environmental and social sustainab...
Ishikawa diagramHaitideveloping countriesAnalysis of solid household waste management in developing countries, shows a demonstration of a patent offset between the target of the service (keep the city clean) and the reality. This study aims to explore the problem in some developing countries, as ...
The determinants of Foreign Direct Investment (FDI) in :外商直接投资(FDI)在决定因素.docx,CHAPTER 1 : INTRODUCTION1.0INTRODUCTIONThis section includes details of overview of foreign direct investment(FDI), background of the study, problem statement, re
To better understand CISs to support planning, maintenance and emergency decision making, modeling and simulation of interdependencies across CISs has recently become a key field of study. This paper reviews the studies in the field and broadly groups the existing modeling and simulation appr...