not mandatory synonym

There are many interfaces in the current project, the data source may be different database or different users of the table, to access the table caused a certain amount of trouble. This time you can use synonyms to simplify. The syntax for synonyms is: CREATE [OR REPLACE] [public] synonym [schema.] Synonym name for [schema.] Object [@dblink]; You also need assignment-related permissions when you create syno

Oracle Database SYNONYM (SYNONYM) Usage This tutorial uses examples to illustrate how to create and delete Synonyms (SYNONYM) in Oracle Data ). Concept Synonyms refer to database objects (tables, views, sequences, stored procedures, and other database objects) referenced by another name. For example: Creating a synonym

Tags: OCA must rom off system rtx syn change fromSynonyms: A synonym is an alias to another data object, the synonym is dependent on its target object, and the synonym becomes invalid if the target object is changed or deleted. Synonyms are not a substitute for the privileges of database objects, that is, the object with the schema is queried, executed, deleted,

It used to be that the synonym (synonym) in SQL Server was useless, so it never looked up its syntax format. Today, there is a problem, with synonym to solve the better. The problem is that I use multiple databases in my system, and because some of the data in each database needs to be synchronized, I add triggers to the tables in one of those databases to synchr

You can use multiple methods to back up synonyms. For example, you can use a script to generate a creation script for synonyms or use dbms_metadata.get_ddl to extract definition scripts for synonyms. However, when using the traditional exp or DataPump expdp for schema-level data migration, public synonyms cannot be exported. However, we can still use the Export and Import method. The difference is that we use the full = y method to export the synonym

1. Why use Synonyms: Synonyms, as the name implies, mean that two words share the same meaning and can be replaced with each other. What are their functions: A's most obvious goal is to simplify SQL. If the name of a database object is too long, you can create a shorter synonym, which is equivalent to the abbreviation. B. another purpose is to hide the information of some objects. for example, to search for a table in another schema, you must add the

Oracle _ sequence, index, synonym, oracle SynonymZookeeper 1. Sequence1. sequence: database objects that can be used by multiple users to generate unique valuesUnique value automatically providedShared objectIt is mainly used to provide the primary key value.Loading Sequence values into memory improves access efficiency 2. create sequence statementCreate sequence sequence[Increment by n] -- the value of each increase[Start with n] -- START from[{MAXVA

After the first two articles, you should be able to write a simple function. But with the depth of use, you will soon feel overwhelmed.Because the basic function is to feel too low, with the official or other people write out of the comparison ... The function of weak chickens is not high.So in order to strengthen our function, let the force lattice up. Start with this article to explain the advanced features.Goal:1. Enter a name and age, directly in the show how old this year.2. Enforce the use

PHP website automation configuration implementation method (mandatory), php mandatory Yii2 is always used as a project, and automatic configuration is used, but it has not been configured on its own. I checked the yii initialization code at noon and found it was php! Yii2 Initialize project code Therefore, we certainly can use php for Project Creation. So I created a new folder named autoConfig, which creat

Fully understand the inheritance in JavaScript (mandatory). javascript is mandatory. In JavaScript, we can use prototype to implement inheritance. For example function baz(){this.oo="";}function foo(){}foo.prototype=new baz();var myFoo=new foo();myFoo.oo; In this way, we can access the attributes oo in baz. In actual use, this is not feasible because of the sharing characteristics of the prototype (data is

The most easily overlooked CSS mandatory line breaks and css mandatory line breaks In general, the element has the default white-space: normal (automatic line feed, PS: Do not wrap is white-space: nowrap ), when the entered text exceeds the defined width, it will automatically wrap, but when the entered data is a pile of characters, letters, or numbers without spaces (regular data should not have it, but so

Thread and multi-thread interviews in April 2018 are mandatory and mandatory in April 2018 Contents Thread and Multithreading Thread running and Creation Thread status 1 thread and Multithreading What is a thread? A Thread is an Object ). What is it? A Java thread (also known as a JVM thread) is a Java Process that allows multiple concurrent tasks. Concurrent tasks in the process become threads, and at

Native ajax waterfall stream demo sharing (mandatory), ajax waterfall demo is mandatory Recently, I heard from my friends that there are a lot of waterfall streams, so I will study it myself. A simple native demo will be shared with you... There are three simple documents with detailed notes: img, ajax. php, demo. php WhereImgPut the image 1.jpg1_2.jpg1_3.jpg in the folder .... Ajax. php page Demo.html pag

Mandatory date format conversion, mandatory date format C # used to compile the winform program. The format is strongly converted and stored in the database. If the database is connected to the program, it will not be written. I hope it will be helpful to everyone. Welcome to comments and share the technology with each other! // Forcibly convert the Date FormatString str1 = deStartDate. EditValue. ToSt

JQuery image carousel Plugin-mandatory for front-end development and mandatory for jquery I still remember that when I first came into contact with the front-end, I browsed all the major websites and most of them had a carousel effect. At that time, I was a completely thorough hacker, it is really interesting to think about how to scroll these images in one direction. Later, I became more familiar with it a

The for loop details of C ++ are mandatory !, For mandatory In C ++, The For (A; B; C) C statement is executed after each loop. For example, y = 10;For (I = 0; I {Cout } The value assignment operation is performed on y only after one loop, so the first output is 10! Explanation of C for loop statements # Include Void main (){Int a, B, c, d = 0;For (a = 1; a {For (B = 1; B {For (c = 1; c {If (! = B B! = C !

Set synonyms for ease of use Select * from EMP; and so on are used for select * from ABC; Create a common synonymIf the user's level is not enough to establish a public synonym, You can authorize it under system: Grant create any synonym to Scott;Grant create public synonym to Scott; Cancel authorization: Revoke create any synoym from Scott;Revoke create public s

PHP writing format (mandatory). php writing details are mandatory. Start with an example. Start the editor, create a PHP file, and type the following code: Name the file test. php and store it in the E: html directory. Access the php file http: // 127.0.0.1/test. php in the address bar of the browser. The output result is as follows: Hello! In this example, we use the echo command to output a string "Hello

The method for searching for SQL Injection websites (mandatory) and SQL is mandatory Method 1:Use google advanced search, such as searching URLs such. Asp? Id = 9As follows: (Note: PHP extension is similar) Method 2:You can also use Baidu's advanced search, such as searching URLs such. Asp? Id = 9As follows: (Note: php extension is similar) The above method for searching for SQL Injection websites

Optimization Methods when Mysql consumes too much CPU (mandatory). mysql is mandatory. When the CPU usage of Mysql is too high, which aspects should we optimize? If the CPU usage is too high, consider the following: 1) In general, to eliminate high concurrency, you should find the SQL statements that cause your CPU to be too high and the show processlist statements that are being executed, and find the SQL