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; Select 1 from dual where ' = ';No records found.Sql> Select 1 from dual where null is null;1---------1 Sql> Select 1 from dual where NVL (null,0) =NVL (null,0); 1---------1The null value is added, minus, multiply, divide, and so on, the result is still empty.Sql> select 1+null from dual;Sql> select 1-null from dual;Sql> select 1*null from dual;Sql> select 1/null from dual;Query to a record.Note: This record is the null in the SQL statementSet some column null valuesUPDATE table1 set column 1=n

, multiply, divide and so on operation, the result is still empty. Sql> select 1+null from dual; Sql> select 1-null from dual; Sql> select 1*null from dual; Sql> select 1/null from dual; Query to a record.Note: This record is the null in the SQL statementSet some column null values UPDATE table1 set column 1=null where column 1 is not NULL; There is an existing sales table sale, the table structure is: Month ch

> Select 1 from dual where null= '; No records found. Sql> Select 1 from dual where ' = '; No records found. Sql> Select 1 from dual where null is null; 1 --------- 1 Sql> Select 1 from dual where NVL (null,0) =NVL (null,0); Got is all the data that's empty and not empty 1 --------- 1 The null value is added, subtract, multiply, divide and so on operation, the result is still empty. Sql> select 1+null from dual; Sql> select 1-null from dual; Sql> select 1*null from dual; Sql> sel

; 1--------- 1sql> Select 1 from dual where NVL (null,0) =NVL (null,0); 1--------- 1 The null value is added, minus, multiply, divide, and so on, the result is still empty. Sql> select 1+null from dual; Sql> select 1-null from dual; Sql> select 1*null from dual; Sql> select 1/null from dual; query to a record. Note: This record is the null in the SQL statementSet some column null values for UPDATE table1 set 1=null where column 1 is not NULL; an existing commodity sal

Java training, Android training, iOS training,. NET training, looking forward to your communicationIn Java Multi-threading, data exceptions can occur if multiple threads are concurrently manipulating shared dataAs in the following code:/* * Mock Sell ticket */class Ticket implements runnable{ private int tick = ten; Object obj = new Object (); public void Run () { while (true) { if (tick>0) { try{thread.sleep (10);} catc

), unbounded following (last row)(1) If the statement is (partition by XXX order by XXX), the default window is unbounded preceding and current row.(2) The statement is (partition by XXX). The window defaults to unbounded preceding and unbounded following.(3) The statement is (), and the window defaults to all result sets.A possible problem occurs when the first method is used.The test environment is as follows:Create Table windowcheck(Oc_date integer,City varchar (50 ),Id integer,

Pentaho schema workbench graphic tutorial,Pentaho schema workbench graphic tutorial The following is a simple example to describe how to use schema workbench. The table example shows a simple sales table, product, product category, and customer dimension table on the network. The logic is simple and easy to understand. 1. Create a sample database 1.1. Create a table SQL There are four tables, one fact table and three dimension tables. The statement for creating a table is as follows: /** Sales

Copy codeThe Code is as follows: create table Sale ( [Id] [int] identity () not null, -- Automatic Growth [Name] [varchar] (16) not null, [SaleTime] [datetime] not null, Constraint [PK_Sale] primary key clustered -- create a primary key ( [Id] ASC ) ) -- Insert some records Insert Sale ([Name], [SaleTime]) values ('zhang san', '2014-1-1 ') Insert Sale ([Name], [S

Copy Code code as follows: CREATE TABLE Sale ( [ID] [int] identity (1,1) not NULL--automatic growth [Name] [varchar] () not NULL, [Saletime] [DateTime] Not NULL, constraint [Pk_sale] PRIMARY key clustered--Create primary key ( [Id] ASC ) ) --Insert Some records Insert Sale ([name],[saletime]) VALUES (' John ', ' 2009-1-1 ') Insert Sale ([name],[sa

Invoice generation Invoices will be generated at the smelters and stock points. The accounting entries for the sale of goods despatched will flow from the sales invoice generated in SAP sales and distribution module. The following entries shall be paslowingCustomer Account DrRevenue crExcise duty payable crSales tax payable (local or central) Cr Note: As mentioned above in the fi document, which is created in the background, the SD invoice number shal

, there are three types: Bus, ring, and star. According to this design, the following Class Diagram Analysis class diagram: The three submodules inherit AbstractColleague, Mediator inherits AbstractMediator, its parent class has three submodule instances, and a unified processing execute method () to complete specific tasks, independent methods in the three sub-modules are required. Public abstract class AbstractColleague {protected AbstractMediator mediator; // Why is it protected: Only

　　 2015 Spring Festival train ticket grab ticket Raiders More tickets to the Software View: 2015 Spring Festival Rush ticket Topic 2015 Spring Festival travel time: The 2015 Chinese New Year is from February 19, so, the 2014-year Spring Festival travel time from February 4, to the end of March 15, a total of 40 days. The Lunar New Year Spring Festival is the 2014 month of 16-2015 year 25. Since November 28, 2014, the Railway department will be the internet, telephone boo

Https://www.youtube.com/watch?v=1yR3F9hnwGUFirst, popularize the femtocell:https://zh.wikipedia.org/wiki/%e5%ae%b6%e5%ba%ad%e5%9f%ba%e7%ab%99.Home Base Station ( English:Femtocell, also translated as Pico Honeycomb Base station), originally called the access point base stations , is a small cellular base station that is generally designed for use in home or small commercial establishments. Connecting to the operator's network via broadband access (such as DSL, cable, fiber) can integrate 2G, 3G

repair a, B, c three brands of mobile phones. Use a class to represent the process:#include #includestring>#includeSet>using namespacestd;classphonestore{Setstring>Phonebrand; Public: voidAddphonebrand (stringphonename); voidSalephonebrand (); voidRepairphonebrand ();};voidPhonestore::addphonebrand (stringphonename) {Phonebrand.insert (phonename);}voidPhonestore::salephonebrand () {Setstring>::iterator Set_it =Phonebrand.cbegin (); while(Set_it! =Phonebrand.cend ()) {cout"our store has""bra

The home base station can provide the mobile communication capability inside the house at the maximum data rate, and does not need to install micro-cell Node B. They are divided into "micro-cells. + 45dbm-the micro-cell base station covers the outdoor area ~ 5 km+ 30dbm-microcell base station coverage zone ~ 0.5 km+ 15dbm-femto base station coverage: 50 m inside the house The femto base station network is connected through the public telephone netwo

active oil-based interface is easy to gather, and its relative water-based interface is in the oil. It is easy to face each other. The reason for this phenomenon is that the internal part of the micro cells in the water is the oily end, solubilization ). The oil stains melted into the microcell are not easy to touch the surface of the object, and the result is the effect of decontamination and cleaning. Generally, household cleanup workers are mainly

); Lock again, hang up blocking Pthread_mutex_trylock (lock); Lock with Trylock, it will not suspend blocking printf ("hello\n"); Sleep (1); Pthread_exit (NULL); } Main () { pthread_t Pthid = 0; Pthread_mutex_init (lock,null); Pthread_create (pthid,null,pthfunc,null); Pthread_join (Pthid,null); Pthread_mutex_destroy (lock); } 4. Locking precautions If a thread is canceled before it is unlocked, the lock will remain locked forever, so if a cancellation point exists within the critical section, it

The absolute inside. Pre-sales salaries for major IT companies in recent years 2004, the days of the letter Beijing salary list: Top 4000-8000, technology over the take can be more than 5000, there are bonuses, sales are not detailed, research and development pay a higher 5000-9000, the implementation of the General Staff. 05, more than 4500 before the sale 2005 CISCO, pre-sale 6000-18000, requirements ccie

: Memento(String n,string p,double B) {name=n; Phone=p; Budget=b; } string GetName () {returnName } string Getphone () {returnPhone } double Getbudget () {returnBudget }Private:String name; string phone; Double budget;}; class salesprospect {Public :void SetName (string n) {name=n; } void Setphone (String p) {phone=p; } void Setbudget (double b) {budget=b; } string GetName () {return

The account amount statement is the sum of each amount that the user spends and the amount of money that the user is making in the system, in layman's words, income and expenses. But many programmers at the beginning of the time, do not know how to achieve, often or appear to have an income record but no expenditure records, or the contrary, so for this issue, the following to explain for you to analyze. 1, the customer is in the system consumption of the amount generated by the Commission, writ