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ArticleDirectory Basic syntax Examples Coalesce and nullif Functions Conclusion The difference between the expression and the as expression after the case and the end is the most obvious -- Oracle Select T_cx_orders. * , Case When Fissendmail = 1 Then Ffilepath Else ' . ' End Downloadpath From T_cx_orders Where Fuserid

Use case diagram: used to describe the relationship between users, requirements, and system function units. It shows a system function model diagram that can be observed by external users. Main Purpose: To help developers understand the functional requirements of the system in a visualized manner Take a look at the following example: It can be seen that the use case diagram consists of a

Object-oriented modelObject-oriented model is a model that uses UML (Unified Modeling Language) to describe the system structure, and it realizes the working state of the system from different angles. These graphs facilitate information exchange between users, managers, system analysts, developers, testers, and other personnel. This article mainly introduces use case diagram, Sequence diagram and class diagram.1. Object-oriented model OomObject-orient

ASP Getting Started Tutorial: ASP Select case In the last lesson you learned how to set a block if the state uses ElseIf keywords, but this is not the most effective way to check multiple conditions. ASP technology use of the choice as an example, check more, equal to the "=" condition of a variable. If you are an experienced programmer, you will realize that the SELECT statement is similar to the declaration of a switch and that other progr

beginningExecute SQL statements Dynamicallydelimiter \\DROPPROCEDUREIFEXISTSproc_sql \\CREATEPROCEDUREproc_sql ()BEGIN declarep1int; setp1 =11; set@p1 = p1; PREPAREprodFROM‘select * from tb2 where nid > ?‘; EXECUTEprodUSING@p1; DEALLOCATEprepareprod;END\\delimiter ;Case in SQL and then else end usageCase has two formats. Simple case function and case search func

Tags: code One technology two SEL solve check condition multi-conditionCaseWhen condition 1 then result 1When condition 2 then result 2When condition 3 then result 3When condition 4 then result 4.........When condition n then result nELSE result XEND Case has two formats. Simple case function and case search function.--Simple

A test case is a document about a specific test step that describes the input parameters, conditions, and configuration of the test, the expected output, and so on to determine whether the software being tested is working properly. Designing, writing, and executing test cases are an important part of the test activity, and test cases are typically managed by a test case management system or tool. First, the

Summary: 1. The database name is case-sensitive and cannot be configured with Parameters 2. The table name is case sensitive (lower_case_table_names can be configured with parameters), and the table alias is case sensitive. 3. The column name and column alias are not case sensitive. 4. Variable names are

costs; relying on human experience to select regression test cases, the selection is inaccurate or the test coverage for program changes is incomplete. Figure 1. Optimization and selection of Test Cases Regression test coverage rate analysis The test case optimization option can effectively solve the coverage problem of existing test cases. However, during the actual test, we still find that there is a problem of incomplete coverage. That is, some im

parameters can not increase or decrease. Although it is sometimes permissible to add new operations, the semantics (or behavior) of the operation should remain the same.Implementation--The implementation of the component can be arbitrarily changed according to the underlying database, algorithm (such as sort) used, as long as the behavior of the customer's concern is not affected, and can even be written in different programming languages.Use case di

Case has two formats. Simple case function and case search function.--Simple case function Sexwhen ' 1 ' then ' Male ' when ' 2 ' then ' women ' else ' other ' end--case search function case when sex = ' 1 ' Then ' man ' when sex

Case has two formats. Simple case function and case search function.--Simple case function CaseSex when ' 1 ' Then ' man ' when ' 2 ' Then ' Woman 'ELSE 'Other ' END--case search Function Case whenSex =' 1 ' Then ' man ' whenS

Tags: SQL caseCase has two formats. Simple case function and case search function.--Simple Case functionCase sex while ' 1 ' then ' Male ' when ' 2 ' Then ' Women ' Else ' other ' END --case search function case when sex = ' 1 ' Then ' Man ' when sex = ' 2 ' Then '

Case has two formats. Simple case functions and case search functions.-- Simple case FunctionCase sexWhen '1' then 'male'When '2' then 'female'Else 'others' end-- Case search functionCase when sex = '1' then 'male'When sex = '2' then 'female'Else 'others' end These two met

Use case diagram (Use Case daigrams) The Use Case view of UML is the view of the external feature description of software products. It describes the demand for software products from the user's perspective rather than the developer's width, and analyzes the functions and dynamic behavior required by the product. The use cas