In the development often encountered to put multiple IDs together with a symbol to separate the incoming database, that split is a big dealSELECTNpushid into#Temp fromTable1WHERE CHARINDEX(',' + CONVERT(VARCHAR(Ten), NCOULMN)+ ',',',' + '3305,3311,3314' + ',')> 0SELECT * from#TempThe columns here are for the int type, so you want to convert.For orders that order the master-slave table, from the table multiple names are stitched together--Instanc
Table structureRequirements: ID and name name may be repeated multiple times. But with only one ID, you need to find the most repeated names and IDs. There are several names that can repeat the most, each with a different ID.SELECT t.id,t.name,a.nu from TLeft JOIN(SELECT Id,name,count () as Nu from-t GROUP by NAME) A on T.name=a.nameJOIN(SELECT id,name,count () As num from T GROUP by NAME ORDER by num DESC LIMIT 1) CWHERE A.nu=c.numThere is a better w
1 CREATEDefiner=' Sa ' @ '%`PROCEDURE' Proc_product_leimu_parentids ' (2 inchPidINT3 )4 BEGIN5 SELECTT2.id, T2. Name from(SELECT @r as_ID, (SELECT @r:=ParentID fromProduct_leimuWHEREId=_ID) asParentID,@l:= @l + 1 asLvl from(SELECT @r:=Pid@l:= 0) VARs, Product_leimu HWHERE @r 0) T16 JOINProduct_leimu T2 ont1._id=T2.idORDER byT1.lvlDESC;7 ENDMySQL Gets the collection of all the parent category IDs and name of the subcategory IDMySQL gets the col
This is a previously encountered SQL interview problem, for reference learning:Find project IDs where all project start times are smaller than previous project end timesMysql> Select * fromT2;+----+---------------------+---------------------+|Id|Start| End |+----+---------------------+---------------------+| 1 | -- on- on xx:xx:xx | -- on- in xx:xx:xx || 2 | -- on- on xx:xx:xx | -- on- A xx:xx:xx || 3 | -- on-Geneva xx:xx:xx |
the firewall security policy setting function, it can immediately block attack actions, but this blocking action can only be applied to TCP sessions, it must be completely limited, it is necessary to re-adjust the firewall security policy setting function, and may also cause another anti-effect: the instant blocking action will allow attackers to discover the existence of IDS, attackers usually look for ways to circumvent or attack
SQL code used to query the names and data of tables with IDs greater than 10000 in Oracle -- query the data with IDs greater than 10000 in all tables and the corresponding table name select 'select id, ''' | table_name | ''' as tablename from '| table_name | 'where id> = 10000 unival' from user_tables; www.2cto.com SQL code -- The result is as follows: select id, 'auth _ member_role' as tablename from AUTH_
How can I use $ a to write the IDs of Zhang San and Li Si to the_id table A of Table B at the same time?
Id name
1 Zhang San
2 Li Si
$ A = 'James, James'
How can I use $ a to write the IDs of Zhang San and Li Si to the_id of Table B at the same time?
That is:
Table B
Id a_id
1, 2
Reply to discussion (solution)
Assume that the id of Table B is an auto-increment field.
Insert into Table B
Test and query five data entries with three IDs in a table.
Test and query 5 pieces of data with three IDs in a table. wait for the code provided by the experts:
I wrote a single query combination faster than thinkphp because there are too many loops.
$ T1 = microtime ()// Start time$ DSN = "mysql: host = local host; dbname = Magazine ";
$ Db = new PDO ($ DSN, 'root', '', array (PDO: ATTR_PERSISTENT => tru
The Apple developer account does not have Merchant IDs or merchantids.
Today, the joint debugging with Hang Chong encountered a problem: his Apple developer account cannot add Merchant IDs. Baidu in China does not seem to have a detailed description for a long time. Then Google. The search result is as follows:
Http://stackoverflow.com/questions/30119629/applepay-how-to-r
Apple enterprise account: you ca
Android SMS Notification IDs: androidid
Private static final int icationication_id = 123; public static final int MESSAGE_FAILED_NOTIFICATION_ID = 789; public static final int DOWNLOAD_FAILED_NOTIFICATION_ID = 531;
The three Notification IDs are respectively received by the new SMS, failed to send the SMS, and failed to receive the SMS.
How to display multiple Android notifications
Void android. app. ic
When hashcode is used, the same ID will appear, although the probability is very small. Although it is not the reason for hashcode, it is another logic problem.
However, I tried to write an ID generator myself. Some IDs are int, for example, task id, and some IDs are long, for example, player ID.
First paste the code to see:
Private Static atomicinteger id = new atomicinteger (0); public static long GETI
Host-Based Intrusion system IDS
CentOS for experimental Linux
Application Background: As system administrators, they need a security mechanism, such as file tampering detection.
So what exactly does it detect? File Content and attributes
AIDE: Short for Advanced Intrusion Detection System
How can this be achieved: AIDE builds a File Attribute Database by scanning a file system of a tampered linux Server
Convert the server file attributes to the databa
The JDBC driver of Informix is type 4.
1. Environment DescriptionOS: Windows XPInformix: IDS V10.00.TC1JDBC: Informix JDBC Embedded SQLJ V2.20JC22. JDBC ConfigurationAfter Informix JDBC is installed, add the ifxjdbc. jar path to the CLASSPATH environment variable, for example, CLASSPATH = C: \ ifxjava_home \ lib \ ifxjdbc. jar ;....The installed directory contains the doc directory, which contains detailed instructions. The demo directory contains the
only IDs are generated for large data files per line4 Main ideas:1 single Thread processing2 Common multithreading3 Hive4 HadoopSearch for some referencesHadoop in Action notes-2, Hadoop input and outputhttps://book.douban.com/annotation/17068812/Textinputformat : File offset : Entire row of dataBut this offset, it seems, is in the offset of a file, not the overall.Generate auto-increment Id in Map-reducejobhttp://shzhangji.com/blog/2013/10/31/generat
A large array of user IDs in inside a multi-table association query statement causes the query time to be too long how to optimize?
1, query statements such as, the execution time is 147.4ms.
Reply content:
A large array of user IDs in inside a multi-table association query statement causes the query time to be too long how to optimize?
1, query statements such as, the execution time is 147.4ms.
This article mainly introduces three methods for generating unique IDs in php. each method is simple and can help you generate unique IDs, interested friends can refer to the small series on the Internet to find a lot of articles on the php generation of unique id method, found that there are many ways, in this article, we will share with you the solutions to generate a unique id for php.
1. md5 (time ().
snowflake algorithm.
The benefits of this algorithm are simple enough to produce approximately 400W different 16-bit digital IDs per second (10 binary)
The principle is simple.
ID is made up of 64bit
One of the first bit vacancies
41bit for storing millisecond timestamps
10bit for storing machine ID
12bit for storing self-increment ID
In addition to the top bit marked as unavailable, the remaining three sets of bit placeholders can be floated to see
We know that when a style sheet defines a style, you can define the ID or define the class, for example:
Id Method: #test {color: #333333} to invoke content in the page
Class method:. Test{color: #333333}, invoking content in the pageID A page can be used only once, class can be referenced multiple times.
A netizen asked, ID and class as if there is no difference, I used a number of IDs in the IE display also normal, with multiple
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