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Modify the default value of a field in mssql

1. Obtain the default values of all tables in the database: The code is as follows:Copy code SelectT3.name as table name, t1.name as field name, t2.text as default value, t4.nameFrom syscolumns t1, syscomments t2, sysobjects t3, sysobjects t4Where t1.cdefault = t2.id and t3.xtype = 'u' and t3.id = t1.idAnd t4.xtype = 'd' and t4.id = t2.id; 2.

Implementation Analysis of MySQL statement locking, mysql statement implementation

gapRecord lock, heap no 4 PHYSICAL RECORD: n_fields 4; compact format; info bits 32 0: len 1; hex 62; asc b;; 1: len 6; hex 000000001734; asc 4;; 2: len 7; hex 28000001570110; asc ( W ;; 3: len 4; hex 8000000a; asc ;;Record lock, heap no 5 PHYSICAL RECORD: n_fields 4; compact format; info bits 32 0: len 1; hex 64; asc d;; 1: len 6; hex 000000001734; asc 4;; 2: len 7; hex 28000001570132; asc ( W 2;; 3: len 4; hex 8000000a; asc ;; Combination 4: No id index + RCPercona ---TRANSACTION 12

Mysql Explain Detailed Introduction _mysql

| |+----+-------------+-------+-------+-------------------+---------+---------+-------+------+-------+ (3). Eq_ref Read a row from the table for each combination of rows from the previous table. This may be the best join type, except for the const type. It is used in all parts of an index to be joined and the index is unique or primary KEY. Eq_ref can be used to compare indexed columns with the = operator. A comparison value can be a constant or an expression that uses a column of a table th

Connect by level syntax

The connect by level syntax is particularly useful when constructing a large amount of data. However, if you do not really understand the meaning of the syntax, misuse will lead to the production of a large amount of data, generally, the incorrect understanding is the Cartesian product of the Base record and the base record. Cartesian product is correct, but not both of them are the base record. One of them is the record of the last level, it is important to know this, otherwise it will produce

ASP. net mvc 5 builds its own CodeTemplate and codetemplate

MvcView directory and we can see Here is a view template, including C # and VB. Since the project uses C #, copy C # To the MvcView directory: (Note: You need to copy Imports. include. t4 and ModelMetadataFunctions. cs. include. t4 at the same time, because the project requires these files to generate views using the base frame) Open one of the templates and find that the Base Frame uses the

Viewpager, using fragment implementation

EffectThe disadvantage of using fragment to achieve tab is that you cannot swipe. But should also calculate the merit, the concrete scene can choose freely.Complete code: Imooc-tab022fragment, in my Baidu Cloud network disk.Mainacgtivity.java1 Packagecom.example.imooc_tab02;2 3 ImportAndroid.os.Bundle;4 Importandroid.support.v4.app.FragmentActivity;5 ImportAndroid.support.v4.app.FragmentManager;6 Importandroid.support.v4.app.FragmentTransaction;7 ImportAndroid.view.View;8 ImportAndroid.view.Vie

Chained storage of data structure tree (tri-fork notation)

//chained storage of trees--three-prong notation#include #include#includestring.h>typedefstruct_treenode{//data fields intdata; //pointer Field struct_treenode * LEFTCHILD;//left child pointer struct_treenode * RIGHTCHILD;//Right Child pointer struct_treenode * parent;//Parent pointer---- more than a binary representation of a parent pointer }treenode, *Treenodepointer;voidTest1 () {//defining the structure body objectTreeNode T1, t2, T3, T4

Can the code below be abbreviated?

", strtotime ("-2 day"). "23:59:59"); // MondayIf ($ t2 $ C1 + = 1;} Elseif ($ t3 $ C2 + = 1;} Elseif (1387420136 $ C3 + = 1;}Echo $ c1;Break;Case 4:$ T1 = strtotime (date ("Y-m-d"). "23:59:59"); // Thursday$ T2 = strtotime (date ("Y-m-d", strtotime ("-1 day"). "23:59:59"); // Wednesday$ T3 = strtotime (date ("Y-m-d", strtotime ("-2 day"). "23:59:59"); // Tuesday$ T4 = strtotime (date ("Y-m-d", strtotime ("-3 day"). "23:59:59"); // MondayIf ($ t2 $ C1

Can the code below be abbreviated?

= strtotime (date ("Y-m-d", strtotime ("-2 day"). "23:59:59"); // MondayIf ($ t2 $ C1 + = 1;} Elseif ($ t3 $ C2 + = 1;} Elseif (1387420136 $ C3 + = 1;}Echo $ c1;Break;Case 4:$ T1 = strtotime (date ("Y-m-d"). "23:59:59"); // Thursday$ T2 = strtotime (date ("Y-m-d", strtotime ("-1 day"). "23:59:59"); // Wednesday$ T3 = strtotime (date ("Y-m-d", strtotime ("-2 day"). "23:59:59"); // Tuesday$ T4 = strtotime (date ("Y-m-d", strtotime ("-3 day"). "23:59:59

A new method of implementing string concatenation in SQL Server 2012

Before the--sqlserver 2012 version /* Handling NOT NULL characters/* DECLARE @t1 varchar (a) = ' a ' DECLARE @t2 varchar (+) = ' B ' DECLARE @t3 varchar (+) = ' C ' DECLARE @t4 varchar (+) = ' d ' DECLARE @N1 int = 2012 SELECT @t1 + @t2 + @t3 + @t4 +convert (varchar), @N1) as result Go /* Handle NULL characters/* DECLARE @t1 varchar (a) = ' a ' DECLARE @t2 varchar (+) = ' B ' DECLARE @t3 varchar

Database-recovery policy and database mirroring

transaction t have been written to the log file but may not have been written to the databaseOracle writes to the database at the time this checkpoint is established!There is no need to perform a redo operation on the transaction T while the recovery process is in progressRecovery strategy using checkpointsT1: Submit before CheckpointT2: Start execution before checkpoint, submit before point of failure after checkpointT3: Start execution before checkpoint, not completed at point of failureT4: S

"Go" MySQL Execution plan analysis

| Simple | T3 | const | primary,idx_t3_id | PRIMARY | 4 | const | 1 | | +----+-------------+-------+-------+-------------------+---------+---------+-------+------+-------+(3). Eq_refFor each row combination from the preceding table, a row is read from the table. This may be the best type of join, except for the const type. It is used in all parts of an index to be joined and the index is unique or primary KEY.Eq_ref can be used for indexed columns that use the = operator

The practice of data Warehouse based on Hadoop Ecological Circle Learning Notes

,Rds.sales_order T1,Allocate_date_dim T2,rds.cdc_time T4where T0.order_number = t1.order_number and t1.order_status = ' A 'and To_date (t1.status_date) = T2.allocate_dateand T1.entry_date gt;= T4.last_load and T1.entry_date DELETE from Sales_order_fact WHERE sales_order_fact.order_number in (SELECT order_number from TMP);INSERT into Sales_order_fact SELECT * from TMP; DROP TABLE IF EXISTS tmp;CREATE TABLE tmp asSelect T0.order_number Order_number,T

Detailed description of data types in JavaScript

(1,1); var PB = new Point (1,1); var pc = PA; Then: PA!=PB; PA!==PB; Pa==pc; Pa===pc; var arr1 = [1,2,3]; var arr2 = [1,2,3]; Arr1!=arr2, ARR1!==ARR2 Have to say 0, false, null, undefined var t1 = 0; var t2 = false; var t3 = null; Var T4; Then: t1==t2;t1!==t2; T1!=t3; t1!==t3; T1!=t4; t1!==t4; T2!=t3; t2!==t3; T2!=

JavaScript Object comparison implements code _javascript techniques

JavaScript Object ComparisonsComparison character:==,!=,===,!==,>=,= = always try to compare them straight, if the type is not the same, always try to convert.= = = More identity, no conversion on the comparison= = If it is the base type (string, number, Boolean), compare their values,var a = "123";var B = 123;Then (a==b) = true;(a===b) = false;If it is object, array, function type, compare their reference. Only if their reference is equal is true.function Point (x,y) {this.x = x;This.y = y;};

Common VBS code is worth a look _vbs

, FC, S,ftype,fcount,i,j,k Dim T1,T2,T3,T4,T5 Dim Imonth,iday Slistfile = "" Set fso = CreateObject ("Scripting.FileSystemObject") Set f = fso. GetFolder (Sshowpath) Set FC = F.files Fcount = Fc.count ReDim Arrfiles (fcount,5) ReDim ArrFiles2 (fcount,5) I=0 ' Sort For each F1 in FC Ftype = Right (F1.name,len (f1.name)-instrrev (F1.name, ".")) Arrfiles (i,0) = F1.name Arrfiles (i,1) = Ftype Arrfiles (i,2) = F1.size Arrfiles (i,3) = F1.

Hierarchical data Model (infinite level directory) algorithm __ algorithm

. retrieving an entire tree Typically, the first task in dealing with layered data is to render a complete tree in some form of indentation. For this reason, the usual practice in pure SQL encoding is to use a self-join: SELECT T1.name as Lev1, t2.name as Lev2, t3.name as Lev3, t4.name as Lev4 From category as T1 Left JOIN category as t2 on t2.parent = t1.category_id Left JOIN category as T3 on t3.parent = t2.category_id Left JOIN category as

Oracle Supplemental Full-Time Blog introduction

this case with the following experiment. First set up the relevant test table: ALTER DATABASE Add supplemental log data (primary Key,unique index) columns;CREATE TABLE test (t1 int, t2 int, t3 int, T4 int);ALTER TABLE TEST ADD constraint Pk_t1 primary key (T1); --Add primary keyThen use a loop to insert a certain amount of dataUpdate test set t2=10; Commit --Update data Using the LOGMNR tool to analyze previous operations

Retake course day44 (MySQL eight index query II)

)); Query OK, 0 rows affected (0.24 sec) mysql> desc t3;+-------+----------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+-------+----------+------+-----+---------+-------+| ID | Int (11) | YES | MUL | NULL | || name | char (15) | YES | | NULL | |+-------+----------+------+-----+---------+-------+2 rows in Set (0.01 sec) Common index constraint keys are: Primary key Unique Key,The normal indexes are: IndexThe specified field is an indexed field af

Javascript Object comparison implementation code _ javascript skills

Js object comparison implementation code. Javascript Object comparisonComparison OPERATOR: = ,! =, = ,! ==, >=, = Always try to compare them straight, if the types are different, always try to convert.=== Comparison same, comparison without conversion= If it is a basic type (string, number, boolean), compare their values,Var a = "123 ";Var B = 123;Then (a = B) = true;(A = B) = false;If it is object, array, function type, compare their reference. Only when their reference is equal is true.Functio

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