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; select * from ta; + ---- + ------ + ------- + | id | name | tb_id | + ---- + ------ + ------- + | 1 | aaa | 1 | 2 | bbb | 2 | 3 | bbb | 4 | + ---- + ------ + ------- + mysql> select * from tb; + ---- + ------ + | id | name | + ---- + ------ + | 1 | xxx | 2 | yyy | 3 | yyy | + ---- + ------ + 1. cartesian Product query: one corresponding record, m records, and n records are queried in two tables. Finally,

Tstringlist Common operations//Tstringlist Common Methods and properties:VarList:tstringlist; I:integer;BeginList: =Tstringlist.create; List.add (‘Strings1‘);{Add to}List.add (‘Strings2‘); List.exchange (0,1);{Replacement}List.insert (0,‘Strings3‘);{Insert}I: = List.indexof (‘Strings1‘);{The first occurrence of the position}List.sort;{Sort}list.sorted: = True;{Specify sort}List.count;{Total}List.text;{Text Collection}List.delete (0);{Delete, 0 is the first data}List.loadfromfile (‘C:\tmp.txt‘);{

// Common tstringlist methods and attributes: VaR List: tstringlist;I: integer; Begin List: = tstringlist. Create;List. Add ( 'Strings1' ); {Add} List. Add ( 'Strings2' );List. Exchange ( 0 , 1 ); {Replacement} List. insert ( 0 , 'Strings3' ); {Insert} I: = List. indexof ( 'Strings1' ); {Location of the first appearance} List. Sort; {Sorting} List. Sorted: = true; {Specified sorting} List. count; {Total

SERVICE1.AAA () and SERVICE2.BBB () to complete a business.At this point service1.aaa () service2.bbb () have transactions, then which of the transactions apply? The propagation behavior of the applied transaction.Propagation behavior of transactions: used to resolve calls between business layer methods and how transactions are passed.2. 7 propagation behaviors of a transaction (Class 3, key 1th)Descriptio

Scenario One: The data in the table Name Score AAA 11 AAA 19 BBB 12 BBB 18 CCC 19 DDD 21 Expected query results are as follows Name Score AAA 30 BBB 30 CCC 19 DDD 21 Copy Code code as follows: ---Check if the table exists if exists (select * from sysobjects where name= ' testsum ') drop table Testsum Go ---create a table CREATE TABLE Te

master on either sideKey One-to-many, multi-pair (class and student, of which class is 1, student is more): in many of the parties to save one side of the primary key Many-to-many (teachers and students, both sides are more): Using the intermediate table, save the corresponding relationship --------------------------------------------------------------------------------------------------six, multi-table query CREATE table TB (ID int primary key,name varchar); CREATE TABLE TA ( ID int primar

INTO TA values (1, ' Liu Bei ', 1); INSERT INTO TA values (2, ' Guan Yu ', 2); insert INTO TA values (3, ' Zhang Fei ', 3); mysql> select * from TA;NB Sp +----+------+-------+ | ID | name | tb_id | +----+------+-------+ | 1 | AAA | 1 | | 2 | BBB | 2 | | 3 | BBB | 4 | +----+------+-------+ mysql> select * from tb; +----+------+ NB sp;| ID | Name | +----+------+ | 1 | XXX | | 2 | YYY | | 3 | YYY | +---

of the first occurrence information that failed to match the successful return null, usage: pattern.exec (str); Need to be aware that there is no "G" of the same Copy Code code as follows: var Re1 =/([a-z]*) bbb/;//Greed document.write (Re1.test ("abbbaabbb1234") + "document.write (Re1.exec ("abbbaabbb1234") + "var Re1 =/([a-z]*) bbb/g;//Greed document.write (Re1.test ("abbbaabbb1234")

": "Testv2", "test3": "TESTV3", "test4": "TESTV4", "Test5": "OK"}> db.test0.update ({"_id":}, {$unset: {"test2": 0}});> Db.test0.find ({"_id": 15});{"_id": {"Floatapprox": "$", "Count": "Test3": "TESTV3", "test4": "TESTV4", "Test5": "OK"}> db.test0.update ({"_id":}, {$unset: {"test3": asdfasf}});Fri 16:17:38 JS Error:ReferenceError:asdfasf is not defined (shell): 0> db.test0.update ({"_id":}, {$unset: {"test3": "Test"}});> Db.test0.find ({"_id": 15});{"_id": {"Floatapprox": +}, "Count": "Test4":

debugging using the PDB The PDB is a Python-brought package that provides an interactive source code debugging feature for Python programs, including setting breakpoints, stepping through debugging, entering function debugging, viewing current code, viewing stack fragments, dynamically changing the values of variables, and more. The PDB provides some common debugging commands, as detailed in table 1.Table 1. PDB Common commands Here's a concrete example of how to debug with the PDB.Listing 1.

more parameters, refer to man xargs it. -A file is read from files as Sdtin $ cat 1.txtAAA BBB CCC DDDA b$ xargs-a 1.txt EchoAAA BBB CCC DDD A B -e flag, note that sometimes-e,flag must be a space-delimited flag that stops when Xargs analyzes the flag that contains flag $ Xargs-e ' ddd '-a 1.txt echoAAA BBB CCC$ cat 1.txt |xargs-e ' D

The difference between are used to activate beans that have already been registered in the Spring container, either through XML or through the package sanning.Let's take a look at their differences in detail below, with three class a,b,c, and the B,c object is injected into A.Package Com.xxx;public Class B {public B () { System.out.println ("Creating bean B:" + this);} } Package Com.xxx;public Class C {public C () { System.out.println ("Creating bean C:" + This);} } Package Com.yyy;imp

": "222"} {ToJSON is the same as ToString, but should use ToString instead of ToJSON if possible, because ToJSON is also calling ToString and reallocating memory}J.free; EndTjsonarray procedure Tform1.button2click (sender:tobject); var A:tjsonarray; Begin A: = Tjsonarray.create; A.add (1); Tjsonarray is not like a traditional array, it can accept several different types of values, which should be considered as an extension of the Delphi array function. A.add (2); A.add (' AAA '); A.add

Native usageAPIs for direct use_.rejectRemoves an element based on the condition.var foo = [ {id: 0, name: "aaa", age: 33}, {id: 1, name: "bbb", age: 25}]var bar = _.reject(foo, [‘id‘, 0])//bar = [{id: 1, name: "bbb", age: 25}]_.pickFilters the value in the first parameter and returns the array based on the key of the second parametervar foo = {id: 0, name: "aaa", age: 33}var bar = _.pick(foo, [‘name‘, ‘

Using a cross tabulation, We can display items in a column field, such as [subject] to display [exam scores]. can the [job score] be displayed in the same cross tabulation query at the same time? For example, the following dataTable 3+ ----- + -------- + ------- + ------ + ------------- +| ID | sname | sclass | course | score | homeworkscore |+ ----- + -------- + ------- + ------ + ------------- +| 1 | AAA | 3 | language | 50 | 8 || 2 | AAA | 3 | mathematics | 83 | 9 || 3 | AAA | 3 | English | 6

Scenario 1: Table Data Name score AAA 11 AAA 19 Bbb 12 Bbb 18 CCC 19 Ddd 21 The expected query result is as follows: Name score AAA 30 Bbb 30 CCC 19 Ddd 21 CopyCode The Code is as follows: --- check whether the table exists If exists (select * From sysobjects where name = 'testsum ') Drop table testsum Go --- Create a table Create Table testsum ( TID int Prima

label: style blog color AR for strong SP Div C 列表 >>> list=[‘aaa‘,‘bbb‘,‘ccc‘]>>> print list[‘aaa‘, ‘bbb‘, ‘ccc‘]>>> print list[1] -- list从0开始计数bbb>>> print list[-1] --输出最后一个ccc>>> print list[1:3] -- 输出一段列表（顾头不顾尾）[‘bbb‘, ‘ccc‘]>>> list.append(‘ddd‘) -- append

Scenario: 1. archive is enabled for the database; 2. All archived logs are online after the data file is created; 3. No backup is performed for the data file or tablespace, and no full database backup is performed for the database. Scenario: 1. archive is enabled for the database; 2. All archived logs are online after the data file is created; 3. No backup is performed for the data file or tablespace, and no full database backup is performed for the database. Scenario: 1. Open archiving for

//TStringList 常用方法与属性:varList: TStringList;i: Integer;beginList := TStringList.Create;List.Add(‘Strings1‘); {添加}List.Add(‘Strings2‘);List.Exchange(0,1); {置换}List.Insert(0,‘Strings3‘); {插入}i := List.IndexOf(‘Strings1‘); {第一次出现的位置}List.Sort; {排序}List.Sorted := True; {指定排序}List.Count; {总数}List.Text; {文本集合}List.Delete(0); {删除, 0是第一个数据}List.LoadFromFile(‘c:\tmp.txt‘);{打开}List.SaveToFile(‘c:\tmp.txt‘); {保存}List.Clear; {清空}List.Free; {释放}end; //读入字符串varList: TStringList;beginList := TStringList.Create;

need to be downloaded for the C + + version. Direct Baidu: Eclipse C + + Chinese version, found the first I downloaded, the title is: "Eclipse idefor C + + developers (Eclipse development C tools) 4.3 SR1 Simplified Chinese full version", File size 144.64MB, file name: Eclipse-cpp-kepler-sr1-win32 directly decompression can be run using, do not need to install. If you can't find it, try the author's path: http://www.newasp.net/soft/73383.html.If you run an error, it may be that the system does