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; 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

, some data that meets the query conditions may not be found,In count (*), use nvl (column name, 0) for processing and then query.7. Sorting is larger than other data (indexes are sorted in descending order by default, small → large ),Therefore, the NULL value is always at the end. Usage:SQL> select 1 from dual where null = null;No records foundSQL> select 1 from dual where null = '';No records foundSQL> select 1 from dual where ''= '';No records foundSQL> select 1 from dual where null is null;1

; 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

Tags: ike _id row character order line data position minimum 0 rows(1) Single-table query 1) Environment preparationmysql> CREATE TABLE company.employee5( id int primary key AUTO_INCREMENT not null, name varchar(30) not null, sex enum(‘male‘,‘female‘) default ‘male‘ not null, hire_date date not null, post varchar(50) not null, job_description varchar(100), salary double(15,2) not null, office int, dep_id int ); insert into company.employee5(name,sex,hire_date,post,job_description,salary,office,d

), 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

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

Brief Introduction to Xbox: Xbox, game, and life Is Chinese companies suitable for developing Xbox games? Can a small and medium-sized company develop Xbox? Can we make a difference in TV games outside of the competitive pcgame market? The following are information about Game Developers Association of Australia and Spring International. Australian Game Developers Association : This is an analysis of the development of the Game Industry Article To illustrate the increase in the demand for talen

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

: 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

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 booking of the start of the sale time to adjust. The time point of the ticket is adjusted from 16 to 21, that is,

Mobile phones are moving towards the era of excess performance ~ Http://www.tomsguide.com/us/dual-core-single-core-Xperia-Play-PlayStation-Snapdragon,news-12474.html A dual-core SOC embedded in a smartphone doesn' t necessarily mean the device will be faster than a single-core phone, claims Sony Ericsson. Zoom On September 18, Sony Ericsson will launch the PlayStation-certified xperia play smartphone on at

　　 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

); } } /** *@ Description: * After the payment is successful, the payment status of all items in the shopping cart is updated. * Note: The local cache data is updated here (not through the interface) */ Public booleanBillsPay (){ BooleanPayStatus =True; // Asynchronous Network payment //TODO // The payment is successfully simulated here. If(PayStatus ){ // Update local cache data UpdateLocalCache (); } Return true; } /** *@ Description: * Update Cache */ Private voidUpdateLocalCache (){ For

); 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