pubsub on sale

the column name you want to select, or the other values you want to define, such as other;To illustrate:Now defines a table named output, where two column definitions are Monthid (VAR) and sale (number type), translated to d,=2000 when translated to c,=3000 when sale value =1000 translation to a , if other values are translated as other;SQL is as follows:Select Monthid, decode (

Process Control Function DECODEIntroduction to the Decode () function:Main functions:Translate the results of the query into other values (i.e. in other forms, as illustrated below);How to use:Select decode (ColumnName, value 1, translation value 1, value 2, translation value 2,... Value n, translation value n, default value)From TalbenameWhere ...Where ColumnName is the column defined in the table to be selected,Meaning explanation:Decode (condition, value 1, translation value 1, value 2, trans

(default value) End If Note: The default value can be either the column name you want to select, or the other values you want to define, such as other; To illustrate: Now defines a table named output, where two column definitions are Monthid (VAR) and sale (number type), translated to d,=2000 when translated to c,=3000 when sale value =1000 translation to a , if other values are translated as other; SQL is

value)End IfNote: The default value can be either the column name you want to select, or the other values you want to define, such as other;To illustrate:Now defines a table named output, where two column definitions are Monthid (VAR) and sale (number type), translated to d,=2000 when translated to c,=3000 when sale value =1000 translation to a , if other values are translated as other;SQL is as follows:Se

query conditions may not be found. In count (*), nvl (column name, 0) is used for processing and then query. (7) sorting is larger than other data (the index is sorted in descending order by default, small → large), so the NULL value is always at the end. Usage: SQL> select 1 from dual where null = null; no records found SQL> select 1 from dual where null = ''; SQL> select 1 from dual where ''=''; SQL> select 1 from dual where null is null; 1 --------- 1 SQL> select 1 from dual where nvl (null,

Enterprise Accounting Standard number 39th-fair value measurementAccounting [2014]6 No.Chapter I. GENERAL PROVISIONSIn order to standardize the measurement and disclosure of fair value, the code is formulated according to the Enterprise Accounting standards-Basic principles.The second fair value refers to the price that a market participant has to pay for the sale of an asset to receive or transfer a liability in an orderly transaction occurring on th

unit. It is impossible for any thread that executes the synchronization code block to see that other threads are executing the synchronization code block protected by the same lock. Note: It doesn't mean that the synchronized code block or the synchronized method is an integral whole and an atomic one, because obviously there is no mutex between different locks. Introduction of ticket purchase examples The following is a program used to simulate ticket sales at the railway station. In theory,

query, add shopping cart and payment functions, the query function includes querying the product, viewing details, and calculating the total price of the product; adding a shopping cart includes viewing details, adding a shopping cart to a product, and paying for the product. Currently, these two modules do not work collaboratively, so we will adapt the shopping cart to work with viewing the product, achieve their integrated operations. Their detailed structure diagram is as follows: Now, the

(translation value 2) ... elsif (conditional = = value N) then return (translated value n) else return (default) End if Note: The default value can be either the column name you want to select or the other values you want to define, such as other; An example is provided: The definition of a table named output, which defines two column is Monthid (VAR) and sale (number type), if the sale value =1000

Tags: return com out table based on tab from if statement berSyntax for the decode () function: 1 Select decode (ColumnName, value 1, translation value 1, value 2, translation value 2,... Value n, translation value n, default value) 2 3 from talbename 4 5 Where ... Where: ColumnName is the column defined in the table to be selected; The default value can be the column name you want to choose, or the other values you want to define, such as other; Primary role: Equivalent to the IF statement,

(1) Preparation environment 1) Create an employee tablemysql> create table company.employee6( -> emp_id int auto_increment primary key not null, -> emp_name varchar(10), -> age int, -> dept_id int);mysql> insert into employee6(emp_name,age,dept_id) values -> (‘tom‘,19,200), -> (‘jack‘,30,201), -> (‘alice‘,24,202), -> (‘robin‘,40,200), -> (‘natasha‘,28,204);2) Create a departmental tablemysql> create table company.department( -> dept_id int, -> dept_name varchar(1

landing function, using Redis is more appropriate than using memcached.Some of the peripheral features of RedisIn addition to being stored as storage, Redis also provides some other functions, such as aggregation calculation, pubsub, scripting, etc., for such functions need to understand its implementation principle, clearly understand its limitations, can be used correctly, such as pubsub function, This i

socket until it expires or responds with a thread.sleep (1000); Socket.send ("World"); } catch (IOException e) {//Ignore timeout e.printstacktrace (); } catch (Interruptedexception e) {e.printstacktrace (); }}}). Start (); } private static void Node0 () {final Reqsocket socket = new Reqsocket (); Socket.connect (URL); New Thread (New Runnable () { public void Run () {while (true) {try {socket.send ("Hello"

functionality of persistence and replication.5. Client support for different languagesMemcached and Redis have rich third-party clients to choose from for different language clients, but because memcached has been developing for a longer period of time, many of Memcached's clients are more mature and stable in terms of client support at present. and Redis because its protocol itself is more complex than memcached, plus the author constantly add new features, and so on, the corresponding third-p

Redis is a high-performance Key-value database. The emergence of Redis, to a large extent, compensates for the lack of memcached such keyvalue storage, in some cases can be a good complement to the relational database. It provides the Python,ruby,erlang,php,java client, which is very convenient to use.Redis uses a single-threaded IO multiplexing model, which encapsulates a simple Aeevent event processing framework that implements Epoll, Kqueue, and select, which can be used to maximize the speed

#指定是否在后台aof文件rewrite期间调用fsync, defaults to NoAuto-aof-rewrite-percentage #指定Redis重写aof文件的条件, which defaults to 100, indicates that the current AOF file growth exceeds 100% of the last Afo file size compared to the last rewrite aof file size. Will trigger background rewrite. If configured to 0, automatic rewrite is disabledAuto-aof-rewrite-min-size 64MB #指定触发rewrite的aof文件大小. If the aof file is less than this value, automatic rewrite is not triggered even if the current file's increment ratio rea

3000activerehashing YesClient-output-buffer-limit Normal 0 0 0Client-output-buffer-limit slave 256MB 64MB 60Client-output-buffer-limit pubsub 32MB 8MB 60Hz 10Aof-rewrite-incremental-fsync Yes[Root@z-dig redis]#Adjust kernel parameters [Root@z-dig redis]# echo >/proc/sys/net/core/somaxconnStart Redis [Root@z-dig redis]#/usr/local/redis/bin/redis-server/usr/local/redis/conf/redis.conf[Root@z-dig redis]# lsof-i:6379COMMAND PID USER FD TYPE DEVICE size/o

calculation, pubsub, scripting, etc., for such functions need to understand its implementation principle, clearly understand its limitations, can be used correctly, such as pubsub function, This is actually not supported by any persistence, the consumer connection between the flash or the reconnection between the message is all lost, and such as aggregation calculation and scripting and other features are

#include using namespace Std;Class Sale{public:Sale (int,int,float);static float average ();static void display ();Privateint num;int quantity;float price;int s;static float sum;static float discount;static int n;};Sale::sale (int nu,int q,float p){num = nu;Quantity = q;Price = P;n + = q;if (q {s = P q discount;sum = sum + S;}Else{s = P q discount * 0.98;sum = su

To help people deal with the site hundreds of, trading a domain name of hundreds of, I would like to talk about my experience in avoiding transaction risk and deception. This is my two years of trading intermediary efforts, the following random examples of several domain names for reference. 　　ad-Type deception: I want to sell vv11.com website, 1000 Pieces of ip,100, (cheat you to click, right when free advertising, such deception, is to waste your time and energy, a glance can see the other sid