condition 1 case

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case in syntax SQL then else end usage-resolves a field to take a different value based on the condition

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

Linux Multithreading Practice (8)--posix condition variables to solve the problem of producer consumers

POSIX condition Variables int Pthread_cond_init (pthread_cond_t *cond, pthread_condattr_t *cond_attr); int Pthread_cond_destroy (pthread_cond_t * cond); int pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex); int

PostgreSQL query optimization: Query Condition Optimization 1 (condition classification)

In SQL, query conditions need to be divided into three types in the query optimization stage. The three types of conditions have different effects and can be converted to each other in some cases.First, describe the SQL statement execution steps,

Hello, C ++ (20). 4.2.2 represents the switch statement selected by the parallel condition: if ...... If ...... If ......,. 4.2.2

Hello, C ++ (20). 4.2.2 represents the switch statement selected by the parallel condition: if ...... If ...... If ......,. 4.2.24.2.2 expression of the switch statement selected by the parallel condition: if ...... If ...... If ...... In the real

Condition variables of pthread

Introduction: The related functions are as follows:1 int pthread_cond_init (pthread_cond_t * cond, pthread_condattr_t * cond_attr );2 int pthread_cond_wait (pthread_cond_t * cond, pthread_mutex_t * mutex );3 int pthread_cond_timewait (pthread_cond_t

Case modeling Guide

Address: http://www.ibm.com/developerworks/cn/rational/r-usecase-atm/index.html Level: elementary Fu chunyi, technical sales manager of Rational China, software department of IBM China Co., Ltd. November 01, 2004 Use Case is a method used to

IBM-Guide to case Modeling

Case modeling GuideFu chunyi, technical sales manager of rational China, software department of IBM China Co., Ltd.November 01, 2004Original URL: http://www-128.ibm.com/developerworks/cn/rational/r-usecase-atm/@

SQL uses case when then multi-condition judgment

SQL uses case when then multi-condition judgment Case   When condition 1 then result 1   When condition 2 then result 2   When Condition 3 then result 3   When condition 4 then result 4.........   When condition n then result n   Else result

Case Model Guide

Use case is a method used to describe system requirements. The process of describing system requirements using use cases is case modeling. The use case method was first proposed by Dr. IVA jackboson and was later integrated into the UML

Case multi-condition Query

Use pubsCreate Table electrician and Dongguan table(Unit: varchar (10 ),2009 varchar (10 ),Conference fee: 2009 varchar (10 ),Transportation fee: 2009 varchar (10 ),Training fee: 2009 varchar (10 ),Hospitality fee 2009 varchar (10 ), 2010 varchar (10

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